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).
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
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.
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
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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:
