Mojtaba Khaleghi

6 Questions 16 Answers 0 Followers

Questions related from Mojtaba Khaleghi

What is the difference between writing UMAT and VUMAT for shell elements? And what points must be considered in writing user mats for shell elements?

Hi all researchers I'm writing user material for shell elements. For writing VUMAT abaqus says that I must write constitutive equation for plane stress condition and I must define thickness strain...

05 May 2015 7,943 2 View

How to define a strain rate dependent pressure amplitude in Abaqus?

Hi all docs and engineersI'm modeling inflation of a polymer sheet under a constant pressure load. i wrote UMAT for viscoelastic behavior of the polymeric sheet. My constitutive equation holds for...

03 March 2015 2,358 4 View

In UAMP subroutine how can I specify props in abaqus CAE?

Hi researchers In UAMP there are props variables like UMAT subroutine but i don't know how to specify constants in abaqus cae like UMAT. in UMAT you specify props in property module but where...

02 February 2015 5,875 6 View

How can I define strain rate dependent parameters in UMAT for shell element?

Hi friends I'm writing a user subroutine for a viscoelastic material and material parameters are depend on shear strain rate. I use DSTRAN(3)/DTIME to relate parameters to the shear strain rate in...

02 February 2015 4,273 2 View

How do you model the inflation of a polymeric sheet under a constant pressure (Thermoforming)?

Hi friends I'm trying to model inflation of a rectangular sheet in abaqus for thermoforming process (Free forming). Material behavior is viscoelastic and I wrote a user subroutine for it. My...

02 February 2015 3,547 7 View

How do you use multiple user subroutines in Abaqus?

Hi everyone, I need to use two user subroutines UMAT and UAMP in abaqus. As you know in UMAT you can use props to specify matrial constants. In UAMP there are props and nprops to specify constants...

02 February 2015 9,654 8 View