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International Journal of Applied Mechanics (IJAM) Vol.2 No.1

Submitted by zishun liu on
research
applied mechanics

Forthcoming papers of International Journal of Applied Mechanics (IJAM) Vol.2 No.1:  

1．“An Alternative Explanation of The Effect of Humidity In Gecko Adhesion: Stiffness Reduction Enhances Adhesion on A Rough Surface”, Bin Chen (McMaster University, Canada) and Huajian Gao (Brown University, USA). 

strain field measurement

Submitted by schuffe on
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strain field measurement

HI,

i am looking into strain field measurement for coupon tension tests for
the purpose of correlation to fea results . a collegue told me that
there is an open source project

which calculates strain field from camera images. does anybody know something about it?

Cheers,

schuffe

Question on non-linear iteration in cases of force-controlled loading and displacement-controlled loading

Submitted by Liu Jinxing on
research

In all textbooks, when iteration methods are introduced, the iterative formula is always H(x)x+f=0, where f is the external force applied on the system. All methods are stated when f is fixed.

Question on the definitions of secant stiffness and tangent stiffness in iterative methods for non-linear problems

Submitted by Liu Jinxing on
research
computational mechanics

Recently, I find that definitions of secant stiffness and tangent stiffness in many books seem pretty confused.Therefore, here I am giving the definitions I think correct, then give my questions on them.

Consider the equation

H(x)x+f=0

(1) Definition of tangent stiffness. As for the above equation, what is the tangent stiffness for some particular value x0?

Let's give the definition according basic knowledge of advanced mathematics. Let's consider the curve H(x)x~x. For this curve, y=H(x)x, so the tangent at x0 is

Post-doctoral position in bio-inspired armor systems at McGill University

Submitted by Francois Barthelat on
job
biomimetics
Dynamic Failure
ceramic armor
numerical modeling

I have an open position for a Post-doctoral researcher in the area of biomimetics and novel ceramic composite armor designs, starting immediately.  

  • Required background: Mechanics of materials, dynamic failure and numerical modeling.
  • Preferred but not required: background in experimental mechanics, biological / biomimetic materials.

Project in partnership with industry, and in collaboration with shock physics and material synthesis experts

Shape memory alloy material models including plasticity implemented in ABAQUS

Submitted by Jim S. Olsen on
research
fracture mechanics
Plasticity
ABAQUS
Shape Memory Alloys
UMAT
NiTi

I am working with shape memory alloys (nitinol), and am in that respect investigating fracture behaviour of NiTi, using, among other things, simulations in ABAQUS. ABAQUS doesn't have a material model that include plasticity unless you pay for it. I am wondering if anyone have implemented either of the following models as a UMAT, and if you are willing to share the code with me.



The models I am interested in are:

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