›› 2009, Vol. 30 ›› Issue (S1): 215-219.

• Numerical Analysis • Previous Articles     Next Articles

Numerical implementations and discussion on hypoplastic model for granular materials based on ABAQUS

CHU Xi-hua, XU Yuan-jie, ZHANG Ming-long, YU Cun   

  1. School of Civil and Archifectural Engineering, Wuhan University, Wuhan 430072, China
  • Received:2009-05-27 Online:2009-08-10 Published:2011-03-16

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Abstract:

The constitutive relation of hypoplastic model for granular materials is represented by Jaumann stress rate and deformation rate, the tangential stiffness matrix for finite element simulation of hypoplasticity is given based on Gudehus-Bauer model with Jaumann rate of Cauchy stress and deformation rate, and it is illustrated that the numerical implementations of hypoplastic model based on ABAQUS must resort to UEL interface proper. For simplifying the of programming development, two methods for tangential modulus matrix are suggested combing with finite element method, viz. tangential modulus matrix based on general invert of matrix and approximate tangential modulus matrix, so numerical methods for implementations of hypoplastic model by UMAT interface are formed. By the approach suggested; the complexity of programming is reduced; and the post processing of ABAQUS can be utilized, so the work efficiency is improved. Numerical examples show the validity of methods suggested and fensibility of programming code.

Key words: granular materials, hypoplastic model, tangential stiffness matrix, tangential module matrix, ABAQUS

CLC Number: 

  • O347
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