Watching buckyballs shrink
PRL 99, 175503 (2007); Jianyu Huang, Feng Ding, Kun Jiao, Boris I Yakobson
Youtube Movie: http://www.youtube.com/watch?v=NSNlE8AreeM http://www.nature.com/nnano/reshigh/2007/1107/full/nnano.2007.404.html
Blog posts
Harvard School of Engineering and Applied Sciences Reception during the MRS Fall Meeting
You are cordially invited to attend a reception, hosted by Harvard School of Engineering and Applied Sciences, during the MRS Fall Meeting, on Monday, 26 November 2007, from 7:30 pm to 10 pm, at Independence Room East, 2nd Floor, Sheraton Boston Hotel & Towers, 39 Dalton Street, Boston, MA.
Dean Venky Narayanamurti, Joanna Aizenberg, Michael Aziz, Shriram Ramanathan, Frans Spaepen, Zhigang Suo, Joost Vlassak
Multiaxial behavior of nanoporous single crystal copper: a molecular dynamics study
The stress-strain behavior and incipient yield surface of nanoporous single crystal copper are studied by the molecular dynamics (MD) method. The problem is modeled by a periodic unit cell subject to multi-axial loading. The loading induced defect evolution is explored. The incipient yield surfaces are found to be tension-compression asymmetric. For given void volume fraction, apparent size effects in the yield surface are predicted: the smaller behaves stronger.
Stress and Strain: Basic Concepts of Continuum Mechanics for Geologists
This book begins by describing real life examples of mechanical states of different materials. The book next discusses stress. This discussion includes force, mohr circles, tensor components of stress, and stress fields. Next strain is discussed. This ranges from measuring deformation to tensor components of infinite and finite strain. The book concludes by outlining different material behaviors. These include Hookean behavior and Newtonian behavior. This last section also discusses energy consumed in deformation.
I wrote a batch file for Crack growth model for ANSYS but when the soution is running,ANSYS terminate itself...Why?
Hello everybody,
I am searching precision of crack propogation in a bonded wafer double.I wrote a code but the problem is that when I want to solve it in ANSYS, the program is shutdown. I need help about it. Thanks for your helps...
Greetings
Volkan DALMISLI
P.S:The code is given below.
finish
/title,sphere wafer
/filname,sphere wafer
/clear,start
HW 15
Title: Theory of Plates and Shells
Author: Stephen P. Tomoshenko and S. Woinowsky-Krieger
Contents:
Chapter 1: Bending of long rectangular plates to a cylindrical surface .
Chapter 2: Pure bending of plates.
Chapter 3: Symmetrical bending of circular plates
Chapter 4: Small deflections of laterally loaded plates
Chapter 5: Simply supported rectangular plates
Chapter 6: Rectangular plates with various edge conditions
Chapter 7: Continuous rectangular plates
Crack formation in thin film during deposition process
Dear Researchers,
I am a research student, "Surface modification of materials" is my research topic. I joined your site to discuss the crack propagation during thin film deposition.
A quesntion of Negative Eigenvalues in Buckling analysis
A simple model was constructed to convince the analytical solution and a numerical results.
For instance, the instability of an Euler column was investigated under uniform pressure with magnitude equal to 1 on the top surface. The FEM calculation (Abaqus) exhibits that the eigenvalue for mode 1 is negative and the minus value cann't be transformed to positive though I have try to variate the mesh size and category as well as calculative measures with Lanczos or subspace.
BTW: the step for this model is applied with Buckle in Linear perturbation
"Crack" versus "Fracture"
It seems that within the field of fracture mechanics, some authors use "fracture" to refer to the mechanism of creating new surfaces within a body by breaking the material bonds and reserve the word "crack" for the sharp-tipped discontinuity that results from fracture of a brittle material. But it does not appear that this distinction is followed consistently throughout the literature, and perhaps different research areas within the fracture mechanics field use the two words in different ways.