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simulation of large rotations by laminated theory?

Submitted by r_n_s_s on

Hello iMechanica,

 

I am wondering if it is possible to perform the non-linear analyses (including large rotations) by laminated theories such as First order Shear Deformation Theory (FSDT) or higher orders and so on. Normally, those theories are valid for moderate rotations but: does anybody know if there is any modification to extend it for large rotations?

Thanks in advance for any advice!

 

Best

R_N_S_S

Mesh Update in ANSYS Workbench After Simulation

Submitted by PRITI YADAV on

Hello Everyone, 
I am using ANSYS Workbench (Static Structural). I need to update the coordinates of the nodes, after each simulation.The new coordinate conditionally depends on the stress tensor value of the previous simulation. If anyone have idea how can I solve this problem please help me out....

Thanks!

Ionic Cable

Submitted by _canhuiyang on

This paper demonstrates a new type of interconnects to fulfill the primary function of axons: transmitting electrical signals over long distances and at high speeds. The interconnect, which we call "ionic cable", uses ions to transmit signals, and is built entirely with soft, elastic materials-elastomers and gels. The ionic cable is highly transparent, and remains functioning after being stretched nearly eight times its original length. We describe the design, theory and experiment of the ionic cable.

rate-state dependent friction in ANSYS

Submitted by Mike Ciavarella on

Dear collegues

a quick question:- I am playing with continuum models of Contact (Hertz, Westergaard and so on) and friction laws. However, I prefer for my students to use ANSYS FEM code. In Ansys there is standard Coulomb, rate-dependence but not rate-state (unless one codes some user subroutines). See

https://www.sharcnet.ca/Software/Fluent14/help/ans_ctec/Hlp_ctec_realke…

Enforcing tie constraint

Submitted by bfa on

Dear iMechanica users,

 

I have a problem which I would appreciate any input on how to solve. I have an indentation problem, in which I indent a cell with an enclosing membrane. Therefore, I create contact between the (rigid) indenter and membrane, and tie the membrane and intracellular solid elements together. The model is an axisymmetric model, with CAX3 and CAX4R making up the intracellular axisymmetric solid elements and SAX1 the axisymmetric membrane.

Revisiting pyramid compression to quantify flexoelectricity: A three-dimensional simulation study

Submitted by Amir Abdollahi on

Flexoelectricity is a universal property of all dielectrics by which they generate a voltage in response to an inhomogeneous deformation. One of the controversial issues in this field concerns the magnitude of flexoelectric coefficients measured experimentally, which greatly exceed theoretical estimates. Furthermore, there is a broad scatter amongst experimental measurements. The truncated pyramid compression method is one of the common setups to quantify flexoelectricity, the interpretation of which relies on simplified analytical equations to estimate strain gradients.

3D FEA of stress concentration

Submitted by setareh on

Dear all,

 

I am simulating tensile specimens with an elliptical pore(representing a flaw in the material) in the mid-cross section of the specimen. What I am looking for is the stress concentration caused by this pore.

I am simulating this as a 3D specimen under tensile loading only, with 3D, 8-node linear brick elements(1st order). Now my questions are:

1- Is there any analytical solution for such problems(3D with elliptical pore) with which I can compare my FEA results?