Journal of Applied Mechanics http://scitation.aip.org/ Journal of Applied Mechanics Scaling of Static Fracture of Quasibrittle Structures: Strength, Lifetime and Fracture Kinetics http://link.aip.org/link/doi/10.1115/1.4005881 Zdenek P. Bazant and Jia-Liang Le<br/> The paper reviews a recently developed finite chain model for the weakest-link statistics of strength, lifetime and size effect of quasibrittle structures, which are structures in which the fracture process zone size is not negligible compared to the cross section size. The theory is based on the re ... [J. Appl. Mech. doi:10.1115/1.4005881] posted Thu Feb 9, 2012. Elastodynamic Analysis of Underground Structural Failures Induced by Seismic Body Waves http://link.aip.org/link/doi/10.1115/1.4005888 Koji Uenishi<br/> Scattering of elastic waves by structural inhomogeneities such as cylindrical cavities has been a subject of intensive study for decades. The time-harmonic elastodynamic analysis making use of the wave function expansions is one of the typical approaches for such problems, and since it gives semi-an ... [J. Appl. Mech. doi:10.1115/1.4005888] posted Mon Feb 6, 2012. Length Scale for Transmission of Rotations in Dense Granular Materials http://link.aip.org/link/doi/10.1115/1.4005887 Sinisa Dj Mesarovic, Jagan M. Padbidri, Carly H. Hansen, and Balasingam Muhunthan<br/> Deformation of granular materials is often characterized by strain localization in the form of shear bands, which exhibit a characteristic width of about 10-20 particle diameters. Much of the relative motion of particles within a shear band is accompanied by rolling, as opposed to sliding, since th ... [J. Appl. Mech. doi:10.1115/1.4005887] posted Mon Feb 6, 2012. Laboratory observations of fault strength in response to changes in normal stress http://link.aip.org/link/doi/10.1115/1.4005883 Nick Beeler, Brian Kilgore, Julian Lozos, and David Oglesby<br/> Changes in fault normal stress can either inhibit or promote rupture propagation, depending on the fault geometry and on how fault shear strength varies in response to the normal stress change. A better understanding of this dependence will lead to improved earthquake simulation techniques, and ult ... [J. Appl. Mech. doi:10.1115/1.4005883] posted Mon Feb 6, 2012. Strain Localization and Slip Instability in a Strain-Rate Hardening, Chemically Weakening Material http://link.aip.org/link/doi/10.1115/1.4005880 Nicolas Brantut and Jean Sulem<br/> The stability of (1) steady slip and (2) homogeneous shear is studied for rate-hardening materials undergoing chemical reactions that produce weaker materials (reaction-weakening process), in drained conditions. In a spring-slider configuration, a linear perturbation analysis provides analytical exp ... [J. Appl. Mech. doi:10.1115/1.4005880] posted Mon Feb 6, 2012. Modeling Turbulent Hydraulic Fracture Near a Free Surface http://link.aip.org/link/doi/10.1115/1.4005879 Victor C. Tsai and James R. Rice<br/> Motivated by observations of subglacial drainage of water, we consider a hydraulic fracture problem in which the crack grows parallel to a free surface, subject to fully turbulent fluid flow. Using a hybrid Chebyshev/series-minimization numerical approach, we solve for the pressure profile, crack o ... [J. Appl. Mech. doi:10.1115/1.4005879] posted Mon Feb 6, 2012. Jim Rice Special Issue Paper: A Fixed-Point Iteration Method with Quadratic Convergence* http://link.aip.org/link/doi/10.1115/1.4005878 T. L. (Sam) Sham and Kevin P. Walker<br/> The fixed-point iteration algorithm is turned into a quadratically convergent scheme for a system of nonlinear equations. Most of the usual methods for obtaining the roots of a system of nonlinear equations rely on expanding the equation system about the roots in a Taylor series, and neglecting the ... [J. Appl. Mech. doi:10.1115/1.4005878] posted Mon Feb 6, 2012. Vibration Characteristics of Rotating Thin Disks, Part II: Analytical Predictions http://link.aip.org/link/doi/10.1115/1.4005810 Ramin MH Khorasany and Stanley G. Hutton<br/> This paper is concerned with the geometric nonlinear analysis of the lateral displacement of thin rotating disks when subjected to a space fixed stationary force. Of particular interest is the development of the stationary wave and the effect of this wave on the frequency response of the disk as a f ... [J. Appl. Mech. doi:10.1115/1.4005810] posted Wed Feb 1, 2012. Initial elastic properties of Uni-Directional Ceramic Matrix Composite fibre tows http://link.aip.org/link/doi/10.1115/1.4005585 David Hayhurst and Matthew Blacklock<br/> The initial elastic properties of two uni-directional Ceramic Matrix Composite tows, comprised of continuous, cylindrical fibres surrounded by one or more matrices, have been calculated using three different methods. The first uses Finite Element, (FE), analysis of the tow to calculate values for el ... [J. Appl. Mech. doi:10.1115/1.4005585] posted Wed Feb 1, 2012. Ellipsoidal Bounds of Elastic Composites http://link.aip.org/link/doi/10.1115/1.4005586 X. F. XU<br/> Formulation of rigorous bounds for physical properties of composites constitutes one of the most fundamental parts of applied mechanics. In this work, the so-called ellipsoidal bounds, as generalization of Hashin-Shtrikman spherical bounds, are formulated for elastic moduli of multi-phase composites ... [J. Appl. Mech. doi:10.1115/1.4005586] posted Wed Feb 1, 2012. On Strength of Graphene http://link.aip.org/link/doi/10.1115/1.4005582 Konstantin Y. Volokh<br/> Failure of a single-atomic-layer graphene sheet is analyzed in plane tension under the varying biaxiality condition. The analysis is based on the combined use of continuum and molecular mechanics where the strain energy is expressed with the help of the Tersoff-Brenner atomistic potential. A critica ... [J. Appl. Mech. doi:10.1115/1.4005582] posted Wed Feb 1, 2012. Dual solutions for the MHD stagnation-point flow of a power-law fluid over a shrinking sheet http://link.aip.org/link/doi/10.1115/1.4005584 Robert A. Van Gorder<br/> We show that there exist bounded self-similar solutions to the steady state problem of the MHD stagnation point flow of a power-law fluid over a shrinking sheet. We then discuss the stability of the unsteady solutions about each steady solution, showing that one steady state solution corresponds to ... [J. Appl. Mech. doi:10.1115/1.4005584] posted Wed Feb 1, 2012. Response of a Rotating Shaft to Uniaxial Random Excitation http://link.aip.org/link/doi/10.1115/1.4005581 Mikhail Dimentberg, Arvid Naess, and Lutz Sperling<br/> Random vibrations are considered for a Jeffcott rotor subject to uniaxial broadband random excitation by a lateral force along one of its transverse axes. Exact analytical solution for mean square responses is obtained which provide quantitative description of two effects: magnification of mean squa ... [J. Appl. Mech. doi:10.1115/1.4005581] posted Wed Feb 1, 2012. Coupling Ritz Method and Triangular Quadrature Rule for Moving Mass Problem http://link.aip.org/link/doi/10.1115/1.4005577 Seiied Aboozar Eftekhari and Ali Asghar Jafari<br/> In this paper, a mixed method which combines the Ritz method and triangular quadrature rule (TQR) is presented for solving time dependent problems. In this study, the Ritz method is first used to discretize the spatial partial derivatives. The TQR is then employed to analogize the temporal derivativ ... [J. Appl. Mech. doi:10.1115/1.4005577] posted Wed Feb 1, 2012. Multiobjective Hybrid Optimization-Antioptimization for Force Design of Tensegrity Structures http://link.aip.org/link/doi/10.1115/1.4005580 Makoto Ohsaki, Jingyao Zhang, and Isaac Elishakoff<br/> Properties of Pareto optimal solutions considering bounded uncertainty are first investigated using an illustrative example of a simple truss. It is shown that the nominal values of the Pareto optimal solutions considering uncertainty are slightly different from those without considering uncertainty ... [J. Appl. Mech. doi:10.1115/1.4005580] posted Wed Feb 1, 2012. A Dispersive Homogenization Model Based on Lattice Approximation for the Prediction of Wave Motion in Laminates http://link.aip.org/link/doi/10.1115/1.4005579 Michele Brun and Giorgio Carta<br/> The propagation of elastic waves in a periodic laminate is considered. The stratified medium is modeled as a homogenized material where the stress depends on the strain and additional higher order strain gradient terms.The homogenization scheme is based on a lattice model approximation tuned on the ... [J. Appl. Mech. doi:10.1115/1.4005579] posted Wed Feb 1, 2012. On Diffusion Through Soft Filter http://link.aip.org/link/doi/10.1115/1.4005578 Konstantin Y. Volokh<br/> Diffusion through soft polymer filters is a nonlinear process: the increase of the pressure on the filtrating liquid does not trigger the proportional increase of the flux through the filter. There are two sources of nonlinearity: the diffusivity properties of the filter and its high deformability. ... [J. Appl. Mech. doi:10.1115/1.4005578] posted Wed Feb 1, 2012. Simulation of Constrained Mechanical Systems - Part II: Explicit Numerical Integration http://link.aip.org/link/doi/10.1115/1.4005573 David J. Braun and Michael Goldfarb<br/> This paper presents an explicit DAE integration method for simulations of constrained mechanical systems modeled with holonomic and nonholonomic constraints. The proposed DAE integrator is based on the equation of constrained motion developed in Part I of this work, which is discretized here using e ... [J. Appl. Mech. doi:10.1115/1.4005573] posted Wed Feb 1, 2012. Admissibilty of Acceleration Dependent Forces in Newtonian Dynamics http://link.aip.org/link/doi/10.1115/1.4005583 Amitabha Ghosh<br/> L. A. Pars has shown in his comprehensive treatise that acceleration dependent forces are not admissible in Newtonian mechanics. More recently Zhechev has shown that the proof given by Pars is faulty and has concluded that acceleration dependent forces are admissible in Newtonian mechanics and in ma ... [J. Appl. Mech. doi:10.1115/1.4005583] posted Wed Feb 1, 2012. Simulation of Constrained Mechanical Systems - Part I: An Equation of Motion http://link.aip.org/link/doi/10.1115/1.4005572 David J. Braun and Michael Goldfarb<br/> This paper presents an equation of motion for numerical simulation of constrained mechanical systems with holonomic and nonholonomic constraints. In order to avoid the error accumulation typically experienced in such simulations, the standard equation of motion is enhanced with embedded force and i ... [J. Appl. Mech. doi:10.1115/1.4005572] posted Tue Jan 31, 2012. Irregular Inhomogeneities in Anisotropic Piezoelectric Planes http://link.aip.org/link/doi/10.1115/1.4005557 Kai-Yu Xu, Ligang Sun, and Ernie Pan<br/> This paper presents an analytical solution for the Eshelby problem of polygonal inhomogeneity in anisotropic piezoelectric full-planes. Based on the equivalent body-force concept of eigenstrain, the induced elastic and piezoelectric fields are first expressed in terms of the line integral on the bou ... [J. Appl. Mech. doi:10.1115/1.4005557] posted Tue Jan 31, 2012. The dynamical functional particle method: an approach for boundary value problems http://link.aip.org/link/doi/10.1115/1.4005563 Sverker Edvardsson, Marten Gulliksson, and Johan Persson<br/> The present work is concerned with new ideas of potential value for solving differential equations. First a brief introduction to particle methods in mechanics is made by revisiting the vibrating string. The full case of non-linear motion is studied and the corresponding non-linear differential equa ... [J. Appl. Mech. doi:10.1115/1.4005563] posted Tue Jan 31, 2012. Durability of an Elastic Bar under Tension with Linear or Non-Linear Relationship between Corrosion Rate and Stress http://link.aip.org/link/doi/10.1115/1.4005564 Isaac Elishakoff, Guillaume Ghyselinck, and Yohan Miglis<br/> In this study we investigate the durability of a bar subjected to tension in presence of corrosion. Various possible relationships are considered between the corrosion velocity and stress. We concentrate on linear, quadratic, purely cubic and general cubic relationships. Closed-form expressions are ... [J. Appl. Mech. doi:10.1115/1.4005564] posted Tue Jan 31, 2012. Vibration Characteristics of Rotating Thin Disks, Part I: Experimental Results http://link.aip.org/link/doi/10.1115/1.4005539 Ramin MH Khorasany and Stanley G. Hutton<br/> Analysis of the linear vibration characteristics of unconstrained rotating isotropic thin disks leads to the important concept of critical speeds. These critical rotational speeds are of interest because they correspond to the situation where a natural frequency of the rotating disk, as measured by ... [J. Appl. Mech. doi:10.1115/1.4005539] posted Tue Jan 31, 2012. REFLECTION AND REFRACTION OF-A HARMONIC SH WAVE AT THE INTERFACE OF TWO DISSIMILAR MEDIA WITH MICRO-HETEROGENEITY http://link.aip.org/link/doi/10.1115/1.4005567 Burhanettin S. Altan<br/> Reflection and refraction of harmonic SH-waves from the interface of two dissimilar media with micro-heterogeneity is studied. The effect of the micro-heterogeneity on the overall behavior of the media is taken into account by adding higher order displacement gradients in the stress-strain relations ... [J. Appl. Mech. doi:10.1115/1.4005567] posted Tue Jan 31, 2012. Conformal contact between a rubber band and rigid cylinders http://link.aip.org/link/doi/10.1115/1.4005566 Takuya Morimoto and Hiroshi Iizuka<br/> We consider a conformal contact problem between a rubber ring and rigid cylinders that involves geometrical and material nonlinearities. The rubber ring is assumed to be incompressible, neo-Hookean rubber. From the geometry and elasticity of the ring, we present simple formulae to estimate the force ... [J. Appl. Mech. doi:10.1115/1.4005566] posted Tue Jan 31, 2012. Aerodynamics of a Rugby Ball http://link.aip.org/link/doi/10.1115/1.4005562 James M Buick<br/> This paper describes the aerodynamic forces on a rugby ball travelling at speeds between 5 and 15 ms. This range is typical of the ball speed during passing play and a range of kicking events during a game of rugby, and complements existing data for higher velocities. At the highest speeds considere ... [J. Appl. Mech. doi:10.1115/1.4005562] posted Tue Jan 31, 2012. Plastic Analysis of Metal Foam Core Sandwich Beam Transversely Loaded by a Flat Punch: Combined Local Denting and Overall Deformation http://link.aip.org/link/doi/10.1115/1.4005561 Qing Hua Qin<br/> The objective of this work is to investigate the quasi-static plastic behavior of fully clamped metal foam core sandwich beam transversely loaded by a flat punch. A rigid-plastic beam-on-foundation model is extended to study the local denting deformation of metal foam core sandwich beam. Effects of ... [J. Appl. Mech. doi:10.1115/1.4005561] posted Mon Jan 30, 2012. Adhesion of a Compliant Cylindrical Shell onto a Rigid Substrate http://link.aip.org/link/doi/10.1115/1.4005555 Sinan Muftu, Jiayi Shi, and Kai-tak Wan<br/> The mechanical deformation of an ideal thin-walled cylindrical shell is investigated in the presence of intersurface interactions with a planar rigid substrate. A Dugdale-Barenblatt-Maugis (DBM) cohesive zone approximation is introduced to simulate the convoluted surface force potential. Without los ... [J. Appl. Mech. doi:10.1115/1.4005555] posted Mon Jan 30, 2012. The multimodal dynamics of a walnut tree: experiments and models http://link.aip.org/link/doi/10.1115/1.4005553 Emmanuel de Langre, Mathieu Rodriguez, Stephane Ploquin, and Bruno Moulia<br/> The dynamics of a walnut tree is investigated in order to better understand the mechanical interaction of trees with wind. Experimental data on the frequencies of modes of the tree are presented. These are derived from several kinds of experiments: pull and release tests, hammer impact tests and win ... [J. Appl. Mech. doi:10.1115/1.4005553] posted Mon Jan 30, 2012. Substructural Damage Detection with Incomplete Information of the Structure http://link.aip.org/link/doi/10.1115/1.4005552 Siu-seong Law and Jun Li<br/> This paper proposes a substructural damage identification approach without the information of interface responses and forces at interface DOFs and only the finite element model of the target substructure is required. The proposed approach is based on the response reconstruction technique using the u ... [J. Appl. Mech. doi:10.1115/1.4005552] posted Mon Jan 30, 2012. Transient Plane Wave Solutions to Homogeneous Equations of Orthotropic Thermoelasticity with Thermal Relaxation: Illustration http://link.aip.org/link/doi/10.1115/1.4005559 Louis M. Brock<br/> The complementary (homogeneous) solutions to the transient equations fro plane wave propagation in a principal plane of an orthotropic thermelastic solid with thermal relaxation include waves without spatial attenuation, but with exponential decay in their wake. Three speeds that vary with decay coe ... [J. Appl. Mech. doi:10.1115/1.4005559] posted Mon Jan 30, 2012. Tensorial representations of Reynolds-stress pressure-strain redistribution http://link.aip.org/link/doi/10.1115/1.4005558 G. A. Gerolymos, C. Lo, and I. Vallet<br/> The purpose of the present note is to contribute in clarifying the relation between representation bases used in the closure for the redistribution (pressure-strain) tensor phi, and to propose a representation basis whose elements have clear physical significance. Indeed, the representation of diffe ... [J. Appl. Mech. doi:10.1115/1.4005558] posted Mon Jan 30, 2012. Viscosity Measurement by the Free Vibrations of Homogeneous Viscoelastic Sphere http://link.aip.org/link/doi/10.1115/1.4005551 Naoki Sakurai, Hidemi Akimoto, and Katsuhiko Nagai<br/> In this paper, a non-destructive method to measure bulk and shear viscosities of a homogeneous viscoelastic sphere using free vibration is investigated by taking into account a single Voigt model for viscous and elastic stress tensors. For the viscosity measurement, Q value characterizing the dampin ... [J. Appl. Mech. doi:10.1115/1.4005551] posted Mon Jan 30, 2012. General representations of polynomial elastic fields http://link.aip.org/link/doi/10.1115/1.4005556 Baixiang Xu and Wang Minzhong<br/> For hybrid finite elements based e.g. on complementary energy functional, polynomial trial functions of stress fields are required. Systematic schemes are given for the 2D and 3D elasticity, respectively. For 2D problems, the paper shows that there are maximal four independent polynomials for the n- ... [J. Appl. Mech. doi:10.1115/1.4005556] posted Mon Jan 30, 2012. Elastic Displacement and Stress Fields Induced by a Dislocation of Polygonal Shape in an Anisotropic Elastic Half-space http://link.aip.org/link/doi/10.1115/1.4005554 Ernie Pan<br/> The elastic displacement and stress fields due to a polygonal dislocation within an anisotropic homogeneous half-space are studied in this paper. Simple line integrals from 0 to pi for the elastic fields are derived by applying the point-force Green's functions in the corresponding half-space. Notab ... [J. Appl. Mech. doi:10.1115/1.4005554] posted Mon Jan 30, 2012. Variational Approach to Beams Resting on Two-Parameter Tensionless Elastic Foundations http://link.aip.org/link/doi/10.1115/1.4005549 Andrea Nobili<br/> This paper presents a Hamiltonian variational formulation to determine the energy minimizing boundary conditions (BCs) of the tensionless contact problem for an Euler-Bernoulli beam resting on either a Pasternak or a Reissner two-parameters foundation. Mathematically, this originates a free-boundary ... [J. Appl. Mech. doi:10.1115/1.4005549] posted Mon Jan 30, 2012. Nonlinear Bending Mechanics of Hygroscopic Liquid Crystal Polymer Networks http://link.aip.org/link/doi/10.1115/1.4005547 William S. Oates, Michael Hays, and Hongbo Wang<br/> A chemically responsive liquid crystal polymer network is experimentally characterized and compared to a nonlinear constitutive model and integrated into a finite element shell model. The constitutive model and large deformation shell model are used to understand water vapor induced bending. This ... [J. Appl. Mech. doi:10.1115/1.4005547] posted Mon Jan 30, 2012. Vertical Action of a concentric multi-annular punch on a transversely isotropic elastic half-space http://link.aip.org/link/doi/10.1115/1.4005546 Morteza Eskandari-Ghadi, Ronald Y. S. Pak, and Azizollah Ardeshir-Behrestaghi<br/> In this paper, the response of a transversely isotropic half-space under the punch action of a set of rigid concentric annuli frictionless contacts is considered. By virtue of a compact potential representation and Hankel transforms, a set of ring-load Green's functions for the axisymmetric equation ... [J. Appl. Mech. doi:10.1115/1.4005546] posted Mon Jan 30, 2012. Analysis of Sandwich Beams with a Compliant Core and with In-Plane Rigidity - Extended High-Order Sandwich Panel Theory versus Elasticity http://link.aip.org/link/doi/10.1115/1.4005550 George Kardomateas, Catherine Phan, and Yeoshua Frostig<br/> A new one-dimensional high order theory for orthotropic elastic sandwich beams is formulated. This new theory is an extension of the High-Order Sandwich Panel Theory (HSAPT) and includes the in-plane rigidity of the core. In this theory, in which the compressibility of the soft core in the transvers ... [J. Appl. Mech. doi:10.1115/1.4005550] posted Mon Jan 30, 2012. A Modified Storen-Rice Bifurcation Analysis of Sheet Metal Forming Limit Diagrams http://link.aip.org/link/doi/10.1115/1.4005538 Mehran Kadkhodayan and Abdolrahman Jaamialahmadi<br/> Bifurcation analysis is a theoretical prediction approach to measure the FLD when the localized neck causes development of vertex on subsequent yield surface as was adopted by Storen-Rice. Some analyses lead to solutions for special cases such as zero and minimum extension. They offer an equation wh ... [J. Appl. Mech. doi:10.1115/1.4005538] posted Mon Jan 30, 2012. The 2011 Koiter Lecture: The simple logic of classical nonlinear thermodynamic shell theory http://link.aip.org/link/doi/10.1115/1.4005536 James G. Simmonds<br/> A classical nonlinear thermodynamic theory of elastic shells is derived by specializing the three-dimensional equations of motion and the Second Law of Thermodynamics to a very general, shell-like body. No assumptions are made on how unknowns vary through the thickness. Extensional and bending strai ... [J. Appl. Mech. doi:10.1115/1.4005536] posted Wed Jan 25, 2012. Static/Dynamic Edge Movability Effect on Non-linear Aerothermoelastic Behavior of Geometrically Imperfect Curved Skin Panel: Flutter and Post-Flutter Analysis http://link.aip.org/link/doi/10.1115/1.4005537 Laith K. Abbas, Xiaoting Rui, Piergiovanni Marzocca, M. Abdalla, and R. De Breuker<br/> This paper addresses the problem of the aerothermoelastic modeling behavior and analyses of skin curved panels with static and dynamic edge movability effect in high supersonic flow. Flutter and post-flutter behavior will be analyzed toward determining under which conditions such panels will exhibit ... [J. Appl. Mech. doi:10.1115/1.4005537] posted Wed Jan 25, 2012. Calculation of the Additional Constants for fcc Materials in Second Strain Gradient Elasticity: Behavior of a Nano-size Bernouli--Euler Beam with Surface Effects http://link.aip.org/link/doi/10.1115/1.4005535 Hossein M. Shodja, Fatemeh Ahmadpoor, and Ali Tehranchi<br/> In addition to enhancement of the results near the point of application of a concentrated load in the vicinity of nano-size defects, capturing surface effects in small structures, in the framework of second strain gradient elasticity is of particular interest. In this framework sixteen additional m ... [J. Appl. Mech. doi:10.1115/1.4005535] posted Wed Jan 25, 2012. Composite Circular Plates with Residual Tensile Stress Undergoing Large Deflections http://link.aip.org/link/doi/10.1115/1.4005534 Benjamin Griffin, Brian Homeijer, Matthew Williams, Bhavani V. Sankar, and Mark Sheplak<br/> Many micromachined electroacoustic devices use thin plates in conjunction with electrical components to measure acoustic signals. Composite layers are needed for electrical passivation, moisture barriers, etc. The layers often contain residual stresses introduced during the fabrication process. Accu ... [J. Appl. Mech. doi:10.1115/1.4005534] posted Wed Jan 25, 2012. Contrasting the predictions for Coulomb and creep-rate dependent friction in the modeling of fiber draw processes http://link.aip.org/link/doi/10.1115/1.4005532 Karl Jacob, Stephen E. Bechtel, and Sanjay Vohra<br/> One of the most important feature in industrial fiber drawing processes is the friction between filament tow and draw rollers, since it is what creates the tension in the fiber that performs the draw. To understand fiber draw it therefore would be valuable to examine the sensitivity of model predict ... [J. Appl. Mech. doi:10.1115/1.4005532] posted Wed Jan 25, 2012. Numerical Simulation and Experimental Study of Flowfield Around a Bullet With a Partial Core http://link.aip.org/link/doi/10.1115/1.4004297 JUAN SANDOVAL, USIEL S. SILVA, Luis Armando Flores, Narcizo Munoz, and VICTOR HERNANDEZ<br/> The geometry, density and velocity of a typical small caliber bullet, are the main factors that stabilize its flight path, range and the impact force, thus the weight variations can indicate the presence of geometrical irregularities or damages of the bullet core, affecting its dynamic characteristi ... [J. Appl. Mech. doi:10.1115/1.4004297] posted Tue Sep 6, 2011. An experimental and numerical study of ballistic impacts on a turbine casing material at varying temperatures http://link.aip.org/link/doi/10.1115/1.4004296 Borja Erice, Francisco Galvez, Tore Borvik, David A. Cendon, and Vicente Sanchez-Galvez<br/> Abstract: An experimental and numerical study of ballistic impacts on steel plates at various temperatures (700C, 400C and room temperature) has been carried out. The motivation for this work is the blade-off event that may occur inside a jet engine turbine. However, as a first attempt to understand ... [J. Appl. Mech. doi:10.1115/1.4004296] posted Tue Sep 6, 2011. Multi-Dimensional Two-Phase Flow Modelling Applied to Interior Ballistics http://link.aip.org/link/doi/10.1115/1.4004293 Julien Nussbaum, Philippe Helluy, Jean-Marc Herard, and Barbara Baschung<br/> Background: Complex phenomena occur in a combustion chamber during a ballistic cycle. From the ignition of the black powder in the primer to the exit of the projectile through the muzzle, two-phase gas-powder mix undertakes various transfers in different forms. A fine comprehension of these effects ... [J. Appl. Mech. doi:10.1115/1.4004293] posted Tue Sep 6, 2011. SIMULATION OF CONTAMINATION PREVENTION FOR OPTICAL WINDOW IN LASER IGNITION SYSTEM OF LARGE-CALIBER GUNS http://link.aip.org/link/doi/10.1115/1.4004284 Xiaobing Zhang and Changjun Ma<br/> In laser ignition system, to ignite the propellant, laser has to be transmitted into chamber through an optical window. If the optical window is destroyed by high pressure or high temperature, or contaminated by the black powder residue, the ignition system will fail in further firings. The sapphire ... [J. Appl. Mech. doi:10.1115/1.4004284] posted Thu May 26, 2011. Study of Bulk-Loaded Liquid Propellant Combustion Propulsion Processes with Stepped-wall Combustion Chamber http://link.aip.org/link/doi/10.1115/1.4004279 Yong-gang Yu, Xue-xia Chang, Na Zhao, Shan-shan Mang, and Yan-huang Zhou<br/> The multilevel stepped-wall chamber is designed to study the combustion stability control mechanism of the bulk-loaded liquid propellant gun (BLPG). The cold state experiment of the interaction of the high speed gas jet with liquid medium is conducted by means of high speed digital camera system. Th ... [J. Appl. Mech. doi:10.1115/1.4004279] posted Thu May 26, 2011. Blast response analysis of reinforced concrete slabs: Experimental procedure and numerical simulation. http://link.aip.org/link/doi/10.1115/1.4004278 David A. Cendon, Gustavo Morales-Alonso, Francisco Galvez, Borja Erice, and Vicente Sanchez-Galvez<br/> A series of blast loading experiments are performed with the aim of providing experimental data for the development and adjustment of numerical tools needed in the modeling of concrete elements subjected to blast. To this end, an experimental set-up that allows testing up to four concrete elements s ... [J. Appl. Mech. doi:10.1115/1.4004278] posted Tue Sep 6, 2011. Computational Fluid Dynamics and Experimental Validations of the Direct Coupling Between Interior, Intermediate and Exterior Ballistics http://link.aip.org/link/doi/10.1115/1.4003812 Roxan CAYZAC, Eric Carette, Thierry Alziary de Roquefort, Francois-Xavier Renard, Dominique Roux, and Jean-Noel Patry<br/> For several years we have been working on the development of a CFD ballistics code called FREIN [21-29, 31, 32]. This code is the result of a strong cooperation between Nexter Munitions and the University of Poitiers. In the last years, efforts have been carried out to improve the 3D modelling. In a ... [J. Appl. Mech. doi:10.1115/1.4003812] posted Tue Sep 6, 2011.