Ask iMechanica

Hi I tried to mesh these two plates with two cases having different geometries. I am trying to achieve something similar in complex geometry in abaqus. But I think the problem is with shapes or if it is something else, please help me with this. I tried in solid elements too it did not work either. I have attached image where you can see two cases 

Cauchy stress values (i.e. the Cauchy stress tensor) changes when the body is subjected to only a rigid body rotation

Whereas, a second Piolla Kirchoff stress values DOES NOT change when the body is subjected to rigid body motion.

Now, in an simulation software the engineer rarely observes the 2nd Piolla Kirchoff stress values (most of the softwares do not even have this output). The engineer is  normally interested is the Cauchy stresss.

Hi,

I am trying to model a compression test for aluminium. In my model I have a 2D rigid plate and a 2D deformable part. And also my part have some space in itself. I used dynamic explicit step with 0.01 time period. It also run somewhere. But then exited with an error. It has some convergence diffuculties. I also tried to adaptive mesh but it gave me same error early. Also I can see the result of solved part and I looked reaction force. I saw too much oscilation for force-time graph. Can anyone help me to solve this problem. I also attached the inp file of model.

Hello, I am new to theory of plasicity and need to learn it by myself. Please suggest a good book for self study for continuum plasticity theory. I am specially interested in metal plasticity theories, in analytical and numerical aspects.

Dear All,

Does anyone know that how we can define trapezoidal CZM for ductile material in Abaqus? Do we need to write a subroutine for it because in Abaqus we can just define CZM for brittle material?

Thank you,

Hello,

I have a 2D mesh that has 4 node solid elements. I am aware that to determine the components of deformation gradient tensor F, I will require displacement functions, u(x,y) and v(x,y) in a current configuration. Taking a partial derivative with respect to x and y respectively yields components of def. gradient tensor F. 

Dear everybody,

I am newbie on ABAQUS simulation. I try to silumate a basic problem: tensile test an unit square Aluminum sheet by Shell S4R element. I used displacement condition where one edge is fixed and the opposite one is move up 10% of the edge length within 1s. For more detailly information, please see Fig. 1.

Dear all,

I'm using UEL in ABAQUS. The UEL works perfectly as far as I have 256 time increments (each 1e-6 sec). When I'm trying to increase the time increments (let's say 512 with the same 1e-6 sec per increment) Abaqus gives me error code 1073741819.

I'm running Abaqus 6.14.2 with Intel Fortran Composer XE 2013 on a Windows 7. CPUs are 3rd generation.

I would appreciate if you could help me to figure it out.

Best Regards,