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Dear all,

Recently I have been running a simulation in ABAQUS, which is the compression of two hemispheres. The two hemispheres are identical, and I think the simulation results of the contact sufaces of the two hemispheres should be identical too. However, I found when I apply only elastic material property, the result is alright, when I change the material property to elastic-plastic (bi-linear), the result is very wierd (the contact sufaces are not symmetric). All of the model is with HEX mesh, when TET mesh is applied there is no such issues.

  Motivated mostly by analytical (or formal) considerations, a vast majority of the works dedicated to the study of the overall plastic response of a porous metal assumes that the sound material (or matrix) obeys a quadratic yielding criterion (von Mises or Hill'48). However, most metals of technological interest today feature significant deviations from the quadratic form of yielding. Therefore a realistic modeling of their behavior, while sustaining damage,  requires appropriate consideration of their yielding properties.

hi dears

i have a problem with contour  reaction force

when i get result in abaqus all contours  is ok but reaction plot is zero 

can help me plz 

my model is helmet motorcycle  and a rigid surface impactor that impact run in 0.2 second and 20 step  with 11.2 mpa pressur on regid surfece impactor.

tnks   

The high-pressure behavior of zinc carbonate ZnCO3 has been investigated using universal structure prediction method together with the density functional theory. In order to explore all possible structures under pressure, separate calculations at high pressure are done here with increasing number of formula units in the unit cell. Two pressures induced phase transitions were considered. The first one occurs at 78 GPa and the second one at 121 GPa.

The objective here is to spread out in detail the various fundamental state properties of smithsonite rock (ZnCO₃) for which the most intrinsic quantities remain still unknown. First-principles electronic structure calculations based on the density functional theory with the pseudopotential method were performed using diverse functionals. A number of mechanical quantities were evaluated such as bulk modulus, elastic constants, Young's and shear moduli, and transversal and longitudinal sound velocities (V_S and V_P).

The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT) in Peking University (PKU) was founded in 2015 with a generous support from the Municipal Government of Beijing. The center focuses on the development of advanced manufacturing technology and energy and environmental technologies. Four research departments under the center are:
1) Advanced manufacturing and design;
2) Simulation and application of software;
3) Energy technologies;
4) Environmental technologies.

Dear friends

I need "the theory of thin shells" by Novozhilov. As I look for it more and more, I find less and less. Can anyone help me to find that on net?

Thanks in advance

I was recently awarded an ERC grant for which I will be hiring up to five new PhD students with different types of expertise. Actual hiring will take some time, as new researchers are needed at different stages of the project (not all PhD students will start at the beginning of the project). Interested candidates with the following backgrounds and skill sets are encouraged to contact me directly at azadpoor [at] gmail.com

Dear imechanicas,

When composite plates with cutouts are meshed, the mesh scheme around the hole is somehow not in a mapped shape. This means the edges of (for instance a four-node element) in undeformed shape are not in a rectangular format. Therefore, defining the constitutive equations of orthotropic materials might lead to incorrect results.

Does anybody have opinion/experience about this issue?

Any response is appreciated.

Regards

R_N_S_S