Hi,
I'm modeling a tunnel (liner) in a soil medium. It has a time dependent modulus of elasticity which means it should reach its maximum value after a while not quickly. I decided to write a USDFLD subroutine to change E with respect to t, but unfortunately I'm a little bit confused about it. I would be grateful if anyone can help me with the subroutine.
thanks in advance
Check this paper:
Check this paper:
E. Martínez-Pañeda and R. Gallego
Numerical analysis of quasi-static fracture in functionally graded materials
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN, 11: 405-424 (2015)
It includes in the Appendix a USDFLD subroutine to change the Young's modulus as a function of the coordinates. It is not exactly what you are looking for but you should be able to change the subroutine to tailor your needs quite easily.
Emilio Martínez Pañeda
www.empaneda.com
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For an intro to subroutines get the file
http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf
Good luck
Frank