fracture mechanics
John Hutchinson's Notes on Nonlinear Fracture Mechanics (Pages Rotated)
Attached to this post are the notes John posted in his blog, with all pages rotated counterclockwise 90 degrees, for those who would like to read them on their computers.
Notes on Nonlinear Fracture Mechanics
These are the notes I wrote at the Technical University of Denmark in 1979. Zhigang Suo and I will be using these in the course on fracture and thin film mechanics (ES 242r) this spring (2007). This is a joint course with the University of Nebraska.
Engineering Sciences 242r: Fracture Mechanics of Thin Films and Composite Materials
Time. Thursday and Tuesday. 1:30-3:00 pm (Harvard University), 12:30-2:2:00 pm (University of Nebraska). First meeting: 1 February 2007
Place. Harvard University: Fairchild 102 (map). University of Nebraska: 111 Walter Scott Engineering Center
Course website (this page): node/754
Instructors
A short paper on T-stress of an interfacial crack in a bi-material strip
The attached file is on T-stress of an interfacial crack in a bi-material strip. The geometry of the problem is the same with that of Suo and Hutchinson (1990, IJF). Using a conservation integral technique, a formula for T-stress is derived with two numerical factors.
Damage Accumulation and Fracture Initiation in Uncracked Ductile Solids
doi:10.1016/j.ijsolstr.2006.12.026
Damage accumulation and fracture initiation in uncracked ductile solids subject to triaxial loading
Liang Xue, International Journal of Solids and Structures, Volume 44, Issue 16, 1 August 2007, Pages 5163-5181
Professor
Department of Engineering Mechanics
Tsinghua University
Beijing 100084, China
Why Do Freezing Rocks Break?
As you know, the volumetric expansion by 9% during the water-to-ice transition can generate tremendous pressure in a confined space is a common sense. As a result, one may expect freezing water to also fracture rocks.
However, in a recent article in Science, Bernard Hallet explains the power of the 9% water-to-ice expansion in confined spaces is undeniable, but it may rarely be significant for rocks under natural conditions, because it requires a tight orchestration of unusual conditions. Unless the rocks are essentially saturated with water and frozen from all sides, the expansion can simply be accommodated by the flow of water into empty pores, or out of the rock through its unfrozen side.
I think it may be of interest to mechanics. Read more
I hope to hear opinions from people who know about the breaking mechanics of rocks.
Delamination in Patterned Films
When the dielectric constant of an insulator in an interconnect is reduced, mechanical properties are often compromised, giving rise to significant challenges in interconnect integration and reliability. Due to low adhesion of the dielectric an interfacial crack may occur during fabrication and testing. To understand the effect of interconnect structure, an interfacial fracture mechanics model has been analyzed for patterned films undergoing a typical thermal excursion during the integration process.