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Adhesion and interfacial fracture toughness between hard and soft materials
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Image of FIG. 1.
FIG. 1.

Schematic illustration of the layers present in the model structure.

Image of FIG. 2.
FIG. 2.

Schematic of the Brazil nut specimen and .

Image of FIG. 3.
FIG. 3.

Schematic of load vs displacement plot describing the corresponding tip-sample interaction phenomena (Ref. 17).

Image of FIG. 4.
FIG. 4.

Typical force per unit area displacement curve for (a) hertz, (b) JKR, (c) DMT, and (d) actual MD adhesion models regarding contact theory of spheres.

Image of FIG. 5.
FIG. 5.

Typical force-displacement curve obtained for parylene C/316L stainless steel adhesion.

Image of FIG. 6.
FIG. 6.

A typical force-displacement curve achieved from the Brazil nut experiment for parylene C/316L interface.

Image of FIG. 7.
FIG. 7.

Fracture toughness measurements obtained for parylene C/316L interface over a range of mode mixities.

Image of FIG. 8.
FIG. 8.

Representative backscattered SEM image of results of a Brazil nut specimen after specimen fractured in Instron. (a) and (d) show the two quadrants on the flat half and (b) and (c) are the two quadrants on the notched half on the Brazil nut.

Image of FIG. 9.
FIG. 9.

Mode I fracture toughness of the parylene C/316L interface vs the prediction from the DMT model.


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Table I.

XPS results of EPO-TEK adhesive illustrating the (a) elemental concentrations (normalized to 100% of the elements detected. XPS does not detect H or He) and (b) atomic concentrations of carbon chemical species.

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Table II.

SEM measurements of the radius of the coated AFM tips.

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Table III.

White light interferometry results describing the rms surface roughness of electropolished 316L coupons.

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Table IV.

Mechanical properties of materials used in the structure of DES.


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Scitation: Adhesion and interfacial fracture toughness between hard and soft materials