research

Hello,

I am trying to model piezoelectric sensors on a concrete beam in ABAQUS. Since I am using brttile cracking model, I have to use ABAQUS / Explicit. But piezoelectric elements are not available in ABAQUS / Explicit.

In some papers I saw that the piezoelectricity modeling problem in ABAQUS / Explicit is solved by replacing it by an equivalent Thermo-Mechanical problem. Does anybody know how to accomplish this?

Do you have any suggestions? Are there any other ways to model piezoelectricity in ABAQUS / Explicit?

My friends 

I'm working on a constitutive model using umat in abaqus. There is a problem and can be described generally as follow:

A constant load is applied on beam elements, however, the elastic modulus decreases as a function of the axial strain of the element and loading time. In another words, the modulus will decrease when the umat is called at DTIME. I used STRESS=STRESS+DDSDDE*DSTRAN to update the stress, however, the result shows that the STRESS, STRAIN and DISPLACEMENT don't change since beginning.