ES 242r

In this lecture I'll describe a recent PhD Thesis by Zhen Zhang.

• Slides are attached.
• Reading material: Section 4 of Z. Suo, " Reliability of interconnect structures." pp. 265-324 in Volume 8: Interfacial and Nanoscale Failure (W.

This set is related to buckle-driven delamination, crack bridging, and interfacial cracks.

Matrix cracking in composites and the competition between penetration and deflection when a crack approaches an interface, and the competition between advance in the interface and kinking out of the interface for an interface crack.

G. Bao and Z. Suo, " Remarks on crack-bridging concepts," Applied Mechanics Review. 45, 355-366 (1992).

I was working on the problem set for and on question 16 and 17 refers to a paper by Charalmbides, Lund, Evans and McMeeking entitled 

This set of homework is on mixed mode fracture and interfacial fracture

Buckling delamination, with two slides on 1D vonKarman plates.

• Z. Suo and J. W. Hutchinson, "Interface crack between two elastic layers," Int. J. Fracture, 43, 1-18 (1990).
• Section III in J.W.

• Williams singularity
• Energy release rate
• Mode angle
• Stress oscillation
• Small scale contact
• Example 1:  A small crack on the interface
• Example 2:  Thin film debonding
• Interfacial fracture energy
• Four-point bend specimen
• Double-cantilever beam
• The use of the interfacial fracture energy