Dear all,

 I'm new to ABAQUS and I was wondering if we could have access to any constitutive equation in ABAQUS and add another stress tensor to the Cauchy stress tensor?

 regards, 

-- Hamid Attaran 

Electromechanical instability in semicrystalline polymers
Xuanhe Zhao , Zhigang Suo
Abstract
When a layer of a semicrystalline polymer is subject to a tensile force in its plane and a voltage through its thickness, the deformation of the layer is initially homogeneous,but then localizes.

T. Zhu, Z. Suo, A. Winkleman, G. M. Whitesides, Applied Physics Letters, 88, 144101, (2006)

A process has been demonstrated recently to assemble microspheres on a patterned electrode under the influence of an applied voltage. Here we examine the mechanics of this process, and describe both the conditions under which excess microspheres jump off the electrode when the voltage is applied, and the forces that attract the remaining microspheres to the desired positions. A quantitative mechanistic understanding of this process rationalizes experimental observations, provides scaling relations, and suggests modifications of the process.