Skip to main content

research

Complex interplay of nonlinear processes in dielectric elastomers.

Submitted by Jian ZHU on

A combination of experiment and theory shows that dielectric elastomers exhibit complex interplay of nonlinear processes. Membranes of a dielectric elastomer are prepared in various states of prestretches by using rigid clamps and mechanical forces.

Tensile stresses in an elastic body accelerated by an attractive body force

Submitted by Jayadeep U. B. on

Dear all,

Can someone suggest me literature where the problem "tensile stresses developed in an elastic body accelerated by an attractive body force" is discussed.  The situation is similar to finding the stresses developed in a celestial body falling into black hole (though my interest is in impact with adhesive forces).

The problem is about solving the inhomogeneous wave equation, where inhomogeneous part is due to the attractive force.  So any helpful hints in that direction will also be useful. 

Brittle cracking in brittle materials

Submitted by surot on

Hi there,

 I am trying to simulate a crack opening process in ABAQUS. I start up from a simple model of plate with a notch subjected to tension. I would like to see the crack opening. To model a brittle mnaterial behaviour I have added a brittle cracking with sub-option brttle failure and brittle shear.

Please look at dat file:

*Heading

  *Node

  *Element, type=CPS3

  *Element, type=CPS4R

  *Nset, nset=ASSEMBLY_PART-1-1__PICKEDSET2

  *Elset, elset=ASSEMBLY_PART-1-1__I1

Modeling of Viscoelasticity with Hypoelasticity constitutive equations

Submitted by Rotimi Adeleye on

Hi all,

I'm trying to model high temperature viscoelasticity using hypoelastic constitutive equations. I'm not sure of how to include the rotation tensor in the generalized viscoelastic equation.

kindly advise me.

Thank you very much.

Objective Stress Rates in Finite Strain of Inelastic Solid and Their Energy Consistency

Submitted by bazant on

In many practical problems of solid mechanics, it is sufficient to characterize material deformation by the small (or linearized) strain tensor. But there are also many problems where the finiteness of strain must be taken into account.

Almansi strain

Submitted by Jerry Brown on
Choose a channel featured in the header of iMechanica

How is the Almansi-Eulerian strain used?

Is there a way to use it with some form of static equations of equilibrium to solve small strain, large rotation problems? I have sucessfully applied the Green-Lagrange strain. But, I can't find anything on how the Almansi-Eulerian strain is used to formulate and solve boundary value problems.

stiffness v/s no. of elements

Submitted by vjuair on
Choose a channel featured in the header of iMechanica

hi,

   i am new to finite elements, i may be wrong, wnen i was solving a problem of hanging beam and load applied at its free end for obvious reasons there was a displacement at the free end. when i increased the no. of elements, deformation was minimum compared to previous result. does this actually mean stiffness got increased? as the basic thing about stiffness is that it depends only on geometry, material property and boundary conditions which were all constant in my case. alll i want to ask is, does stiffness depends on no. of elements? 

thanks