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How to do such integration with dummy indicials for strain energy density?

Submitted by pengfei_guo on
strain energy density
tensorial analysis
The integration puzzles me is
Integrate C_ijkl e_kl de_ij  (from 0 to e_ij )= 1/2 C_ijkl e_ij e_kl
which is the well known strain energy density of elasticity and much like the energy in a spring as
Integrate k x dx  (from 0 to x ) = 1/2 k x x.
By the way, this integration appears at page 226 in the book "Nonlinear Finite Elements for Continua and Structures" by T Belytschko, B Moran, WK Liu, 1999, the book just directly throws out the result without any details.

Tenure Track Faculty Positions in The Department of Aerospace Engineering and Mechanics, The University of Alabama

Submitted by unnithan on
job
job
Aerospace Engineering and Mechanics
The University of Alabama
tenure track faculty positions
THE UNIVERSITY OF ALABAMA

DEPARTMENT OF AEROSPACE ENGINEERING AND MECHANICS
Seeks applications for three tenure-track faculty positions

Multiple Ph.D. Positions in Mechanics of Soft Materials at Michigan State University

Submitted by Roozbehdar on
job
position
ph.d.
job
mechanics
civil
Michigan

The recently founded Group of Appleid mechanics in Enviormental & Civil Engineering Department at Michigan State University has a few openings for PhD positions to work on Multiscale Modeling of Soft Materials starting Fall 2014.

Virtual Special Issue: CFD simulation of pedestrian-level wind conditions around buildings: past achievements and prospects

Submitted by Laure Ballu on
research
thermal
construction
WIND engineering
CFD simulation
industrial aerodynamics
pedestrian
windbreaks

This Virtual Specail Issue deals with papers on CFD simulation of pedestrian-level wind conditions around buildings, published in the Journal of Wind Engineering and Industrial Aerodynamics (JWEIA).

Force and stroke of a hydrogel actuator

Submitted by Widusha Illeperuma on
research
suo group research
hydrogel
Vlassak group

Hydrogels that undergo a volume phase transition in response to an
external stimulus are of great interest because of their possible use as
actuator materials. The performance of an actuator material is normally
characterized by its force–stroke curve, but little is known about the
force–stroke behavior of hydrogels. We use the theory of the ideal
elastomeric gel to predict the force–stroke curves of a
temperature-sensitive hydrogel and introduce an experimental method for
measuring the curve. The technique is applied to PNIPAm hydrogels with
low cross-link densities. The maximum force generated by the hydrogel
increases with increasing cross-link density, while the maximum stroke

True Stress-Strain curve of metals

Submitted by PenPen on
research
stress analysis
strength coefficient
strain-hardening exponent

Hi everyone!

I was hopping to find some help over here. I just need some references or links to the true stress-strain curves of differents metals. I'm working with Tin and i'm going to do run some compression test to valid an analitic method. In order to do this, I need the strain-hardening exponent (n) and the strength coefficient (C) and it's being impossible to find those.

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