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PhD Position in geotechnical earthquake engineering at the Université Gustave Eiffel, France (Extended to May 15 2020)

A new PhD position is open at the Université Gustave Eiffel, France. The project will focus on the investigate the influence of ground liquefaction on the behavior of homogeneous embankment under seismic loading. The technical strategy of this study will be a combined approach of 70% physical centrifuge modeling and 30% numerical modeling. The experimental study will provide important proof on the physical phenomena and essential data for numerical modeling; Being the complimentary of experimental work, the calibrated numerical model will be used to carry out parametric and case studies.

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Abaqus Error Singnal 8

Dear all,

  I am working on an UMAT subroutine. The problem I have is that it works on windows system, however, when I run it on Linux environment I got  the error msg "system error "Illegal floating point operation" (signal 8)."

  I checked the subroutine for many times and also it works under windows, so it can not come from the problem of dividing by zero or something like that.

 Does anyone know why the Signal 8 error happens? I think many subroutine programmers have the same problem.

Thanks

 Zheng Li

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Damping when using UMAT in Abaqus

As it is known, when using UMAT abaqus, stiffness proportional damping can not be used. However, for the dynamic calculation it is neccessary to put some stiffness damping. So for approximate calculations, it is easy to use numerical damping instead.

 *Dynamic, application=XXX,

and using the key words *Dynamic, XXX, users can adjust the value for numerical damping. Althogh, there is no physical meaning for numerical damping, it can be a temperory solution for UMAT dynamic calculation.

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