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Problems about the Contact Roller of the 3D FE Model in ADINA

Submitted by Yifan Huang on
software
fracture
ADINA
Contact Roller
3D FE Model

Dear everyone,

Recently I am running a 3D FE model in ADINA to
analyse the elastic-plastic fracture behaviour.

A three-point bending specimen was modeled and the specimen was
supported by a contact roller.

Here is the problem:

In a rather small loading (load line displacement was about 0.1mm),
the program indicated that “the mesh is
too distorted” and stopped running. It also showed “No convergence” and stopped if the small strain formulation was
used.

3d crack modelling and calculation of j integral in ansys 13.0

Submitted by sbmarwadi on
fracture mechanics

hello,

i am trying to calculate a j integral values for a 3d crack in ansys.

i tried with a following txt code and as a input file.

the following code actully works for 2d crack for defined paths.what changes should be made to this for getting j-integral values in 3d crack?

Boundary conditions and gradient discontinuity in lower-order gradient plasticity

Submitted by Amit Acharya on
research
Gradient Plasticity
evolution problem

Amit Acharya, Huang Tang, Sunil Saigal, John L. Bassani, On boundary conditions and plastic strain-gradient discontinuity in lower-order gradient plasticity, Journal of the Mechanics and Physics of Solids, 52 (2004) 1793 – 1826

Output Total Force on a Straight Line

Submitted by SBS on
research
ansys
output
total force

 

Dear All,

 I am using ANSYS 13.0 APDL to simulate a elastic model to calculate stress intensity factor. I got the solution successfully. However, I want to verify the answer with theoretical solution from crack analysis handbook. So I need to output the total force on a straightline. 

Strain Gradient Plasticity

Submitted by Mubeen on
research
Finite Element Method
strain gradient plasticity

Hi all,

I have a strange question that has puzzled me since last almost one year.

There are many SG-plasticity models in the technical literature, sometimes categorized as lower-order or higher-order models.

The problem is :

the constitutive models include the gradient of plastic parameters (e.g. plastic slip).

Solid/Fluid Mechacnics

Submitted by yaronben on
research
size scale dependent plasticity

Hi,

In my research i am trying to develop a new model for plastic deformation, and i suspect there is a strong similarity between

plasticity and turbulent flow !.

My question is: if there is workd done trying to apply Reynolds decomposition (Reynolds Stress) to the governing equations and solved plasticity problem in Solids?

thanks,

Yaron B.S.

Nonlinear geometric effects in mechanical bistable morphing structures

Submitted by zichen on
research
elasticity
mechanical instability
Geometric nonlinearity
bistability
thin structure
edge effect

Bistable structures, exemplified
by the Venus flytrap and slap bracelets, can switch between different
functional shapes upon actuation, and have important applications in
mechanical/electro-mechanical devices ranging from bio-inspired robots to
deployable aeroplane wings. Despite numerous efforts in modeling such large
deformation of shell structures, the roles of mechanical and nonlinear geometric
effects on bistability remains elusive. Closely related, emerging challenges
include modeling the spontaneous curving and buckling of thin objects such as

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