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Del.icio.us

Submitted by Michael H. Suo on

Del.icio.us is a social bookmarking web service. One might say, why do I need del.icio.us if I have bookmarking capabilities built right into my browser? Well, here are some reasons:

  • del.icio.us uses a non-hierarchical categorization system, that is, instead of organizing your bookmarks in folders, you assign tags to them.

Micromechanical Exfoliation and Graphene: 1999 papers and brief discussion of them

Submitted by Rod Ruoff on

The discovery of a new material type, graphene and extremely thin platelets of graphite, was discussed in several articles from my research group published in 1999:

Lu XK, Huang H, Nemchuk N, and Ruoff RS, Patterning of highly oriented pyrolytic graphite by oxygen plasma etching, APPLIED PHYSICS LETTERS, 75, 193-195 (1999).

an interesting puzzle: multiscale mechanics

Submitted by Henry Tan on

an interesting puzzle for fun:

Lame’s classical solution for an elastic 2D plate, with a hole of radius a and uniform tensile stress applied at the far field, gives a stress concentration factor (SCF) of two at the edge of the hole. This SCF=2 is independent of the hole radius.

Consider what happened to this concentration factor if the radius a approaches infinitely small. The SCF is independent of a, so it remains equal to two even when the hole disappears.

Three-dimensional anisotropic elasticity - an extended Stroh formalism

Submitted by Jim Barber on

Tom Ting and I have recently developed a method of extending Stroh's anisotropic formalism to problems in three dimensions. The unproofed paper can be accessed at http://www-personal.umich.edu/~jbarber/Stroh.pdf .

Quasi-continuum orbital-free density-functional theory : A route to multi-million atom electronic structure (DFT) calculation

Submitted by Vikram Gavini on

I would like to share the research work I have been pursuing over the past four years. I believe, through this forum, I will be able to reach researchers with various backgrounds and expertise. Suggestions and comments from members will be very useful. I am also attaching links to preprints of manuscripts describing this work. Please follow these links:

http://www-personal.umich.edu/~vikramg/academic/Preprints/QC-OFDFT.pdf

Multi-Axial Failure Models for Fiber-Reinforced Composites

Submitted by Ashkan Vaziri on

The increasing use of fiber-reinforced composites accentuates the need for developing multi-axial fatigue failure models for these materials. In this article (attached), we proposed several multiaxial fatigue failure models for fiber-reinforced composites considering the contribution of mean and cyclic normal stress/strain and shear stress/strain at the plane of failure and examined their capability for predicting the fatigue life of the E-glass/epoxy composite materials.

Lecture 9 Interfacial fracture

Submitted by Zhigang Suo on
  • 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