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Experimental investigation of dynamic effects in a two-bar/three-point bend fracture test
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10.1063/1.2746630
/content/aip/journal/rsi/78/6/10.1063/1.2746630
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/6/10.1063/1.2746630

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the loading end of the split-Hopkinson pressure bar modified for the two-bar/three-point bend dynamic fracture test.

Image of FIG. 2.
FIG. 2.

Electrical circuit designed for the output voltage measurement.

Image of FIG. 3.
FIG. 3.

Typical original stress pulses and output voltages recorded from a small Ti-6-22-22 specimen. All the signals are time synchronized and have a same time origin, taken when the data acquisition system is triggered to record prior to the arrival of the incident pulse.

Image of FIG. 4.
FIG. 4.

Typical dynamic loads applied on each different material specimen as a function of time, computed by Eq. (2) using the transmitted pulses, showing a loading characteristic strongly dependent on the mechanical property of material.

Image of FIG. 5.
FIG. 5.

Typical output voltage variations as a function of time obtained from (a) small high strength steel specimen, (b) small Al-6061-T6 alloy specimen, (c) large high strength steel specimen, and (d) large Al-6061-T6 alloy specimen. Time origin is taken when the incident pulse begins traveling in the incident bar.

Image of FIG. 6.
FIG. 6.

Selected sequence of high-speed images shows the contact situation between the impactor and specimen (small steel specimen) during the loading process in the current setup. Time origin is taken when the stress wave reaches the uncracked surface of the specimen. (a) , (b) , (c) , (d) , (e) , (f) , (g) , (h) , and (i) time sequences for a singular, representative experiment.

Image of FIG. 7.
FIG. 7.

Original stress pulses (incident, reflected, and transmitted) obtained from a small uncracked high strength steel specimen using a long striker. (a) Unshaped-pulse test, the rise time and duration of the incident pulse are and , respectively, and (b) pulse-shaped test, the rise time and duration of the incident pulse are and , respectively. An aluminum pulse shaper was used for this test with dimensions of (thickness). The gain of the amplifier for the incident and reflected pulse was 20, while the gain for the transmitted pulse was 50.

Image of FIG. 8.
FIG. 8.

Original stress pulses (incident, reflected, and transmitted) obtained from a small, uncracked, high strength steel specimen using long striker. (a) Unshaped-pulse test, the rise time and duration of the incident pulse are and , respectively, and (b) pulse-shaped test, the rise time and duration of the incident pulse are and , respectively. An aluminum sheet pulse shaper used for this test had dimensions of (thickness). Here the gain of the amplifier for incident and reflected pulse was 20, while the gain for the transmitted pulse was 50.

Tables

Generic image for table
Table I.

Quasistatic mechanical properties of test materials.

Generic image for table
Table II.

Time parameters for small specimens . (, time for the shear wave to reach interface II from interface I; , dynamic crack initiation time; and , load duration from the load vs time diagram).

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/content/aip/journal/rsi/78/6/10.1063/1.2746630
2007-06-22
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental investigation of dynamic effects in a two-bar/three-point bend fracture test
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/6/10.1063/1.2746630
10.1063/1.2746630
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