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Hello,



I am running a simulation where I have a rigid body (shell elements) pushing into a deformable part.  Unfortunately, the simulation aborts with the following error:



The dot product -0.19758 cannot be negative for element 30050 instance xzy with record ID 844 at step 2 inc 1 kitgen 5.



This element (C3D4H) belongs to the deformable part and is within the body, so no not close to the contact at all.  At the point where the simulation aborts, this element is not deformed and the stress is basically 0 (E-6).

Hello eeryone here.I am very new user here but before signing up here i saw a numbers of interestig post .Here i have a problem .I am asked to simulate a cutting process with abaqus.A cutting tool cuttong through a work piece .The objective is to check the variation of the work piece profile based on the change on tool change.

I would like to know the factors that effect the thin film fluid material spreading under Ac votage? is there any equation which relates to viscosity, dielectric constant, bonding etc

Hi all,I'm a student of of Madras Institute of Technology, Chennai.I'm trying to do stress intensity based crack propagation in metals. I’m using Abaqus/CAE. I’m following the abaqus 6.5 documentation, I have completed upto “Contour integral evaluation,” (Section 7.10.2). but I’m unable to proceed further, since “Crack propagation analysis”, (Section 7.10.3) refers only “Input file usage” (Not Abaqus/CAE Usage)I hope someone can help me

Hello,

I am an instructor who teaches the partial differential equatioin for mechanical engineering students at Myong Ji University in South Korea using the book, "partial differential equations for scientists and engineers" written by Prof. Stanley J. Farlow.

Luckly our department professor handed me over a copy of solution manual but which was not completed. Thus I wonder if anyone has a complete solution manual for this book. It will be grateful if I may be able to obtain a complete solution manual.

Thank you very much,

Young June Yoon

Professor YC Fung, the widely-recognized father of modern biomechanics, recently challenged the field by asking this fundamental question: “What axioms of the classical continuum mechanics have to be changed for biology?”

Hi every one,

I think that there is a method for automatic failed element removal  using UMAT subroutine, I mean that at every iteriation failed elements with the help of a failure criterion to be indicated and to its material behaviour to set to zero and this means that a path for crack propagation will form .... Anyway, if any body is intrested we can clarify this subroutine step by step for all of the visitors in this website, I mean that an open source subroutine to be expanded here.

Thank you,