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In practice, the SiN stripes or pads are periodically patterned on silicon, so the spacing effect on dislocation injection from sharp features deserves attention. As in Figure 1, the SiN stripes with residue stress, of width L and thickness h, are periodically patterned with spacing S. In the numerical calculation, we take shear modulus and Poisson’s ratio of Si₃N₄ to be 54.3 GPa and 0.27, and those of silicon 68.1GPa and 0.22, the same as in Ref.[1].

The Symposium on Characterization and Modeling of Time-Dependent Materials and Processes at the 2007 ASME Mechanics and Materials conference will be held June 3-7, 2007, at the University of Texas at Austin. Additional information about the conference can be found at the conference website.

Papers dealing with modeling and experimental aspects of the subject area, involving all materials, are sought. The mechanical response should be non-negligable in cases involving non-mechanical fields. Possible topics include, but are not limited to: characterization and modeling of behavior at multiple scales; viscoelasticity, viscoplasticity; transport, chemically and electronically active processes; multiphase and biomaterial systems; thermodynamics; shape memory; mechanics of testing; micro/nanoindentation on time-dependent materials; dynamic behavior of polymers and composites; large deformations; residual stresses; time-dependent damage and failure; polycrystalline and single crystal behaviors; multifunctional materials; mechanics of processing.

Applications are invited from suitably qualified candidates for a Postdoc/Research Scientist position in the framework of a Danish/Nepalese collaborative research project, in the Materials Research Department of Risø National Laboratory, Denmark 

Job description: As a postdoc/scientist, you will carry out numerical micromechanical modelling of fatigue processes in wood. The theme of the project is the computational analysis of the effect of microstructures of natural materials (wood), coatings and other microscale parameters on their fatigue resistance and lifetime under cyclic loading. The experiments and verification of results will be carried out in collaboration with project partners in Kathmandu, Nepal. The deliverables of the project should include the development of recommendations for the improvement of the reliability of wind turbine blades, produced from coated wood in Nepal, as well as extracting “lessons from nature” to be used in the improvement of polymer matrix fiber reinforced composites for wind energy applications.  

The notes are part of the course on advanced elasticity. 

Hi fellow mechanicians,

Professor Suo and I have devised a model for creating a journal on iMechanica. It is a simple model which doesn’t require installing any additional modules or features.

We simply let a user be a journal manager, and he selects excellent blog entries as articles to be published in the next issue of the journal. He will then create a blog entry listing the titles of the articles with their respective authors and make each title a link to the original post. This way another user only needs to click on the title of an article to see the full entry.