It is with deep sorrow that we inform you that Jim Knowles passed away today.
Updates on 7 November 2009. A photo of Jim is received from Rohan Abeyaratne. The following is a Caltech press release issued on the passing of James K. Knowles, William R. Kenan, Jr., Professor and Professor of Applied Mechanics, Emeritus.
Hi, I have been reading a chapter on Co-rotational Formulation for trusses in Non-Linear Finite Element Analysis. And, I am here with a question which a very basic question concerning linear analysis.
Now, a co-rotational formulation for trusses (say) separates the rigid motion from the motion of the truss and what remains is strain causing the deformation of the truss element. My basic question is, that, while doing linear analysis, is it that, the displacements which we obtain in case of trusses or even beams include rigid body motion as well?
Hi Dear IMechanica User
I have faced up a problem during micro-scale cutting using abrasives. I am trying to model this process using Abaqus/explicit and with remeshing module. but currently there doesnt exist any remeshing technique in abaqus/explicit. Could you please suggest the way for doing this simulation by using remeshing technique in Abaqus/explicit. Abaqus/standard is not helpfull to model cutting simulation. this is because i am using Abaqus/explicit by the way.
I am awaiting your valuable suggestions and helpfull informations.
Hello everyone!
I'm interested in branching of Mode II propagating crack, mostly in high Cr steels, but any info may be useful and interesting. Does it tend to branch? What are the criteria? Velocity? Angle of branching?
Thanks,
Marina
Gordon Conference 2010Thin Film & Small Scale Mechanical Behavior
July 25-30, 2010, Colby College, Waterville, ME
Chair: Oliver Kraft (oliver.kraft [at] kit.edu), Vice Chair: John Balk
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
