Blog posts

On optimal hierarchy of load-bearing biological materials

Submitted by Zuoqi Zhang on Sat, 09/18/2010 - 07:22

Load-bearing biological materials such as shell, mineralized tendon and bone exhibit 2-7 levels of structural hierarchy based on constituent materials (biominerals and proteins) of relatively poor mechanical properties. A key question that remains unanswered is what determines the number of hierarchical levels in these materials. Here we develop a quasi-self-similar hierarchical model to show that,

Mechanical properties of unidirectional nanocomposites with non-uniformly/randomly staggered platelet distribution

Submitted by Zuoqi Zhang on Sat, 09/18/2010 - 06:55

research

mechanical properties

biocomposites

biomimetic composites

Unidirectional nanocomposite structures with parallel staggered platelet reinforcements are widely observed in natural biological materials. Our recent paper, published in J. Mech. Phys. Solids, is aimed at an investigation of the stiffness, strength, failure strain and energy storage capacity of a unidirectional nanocomposite with non-uniformly or randomly staggered platelet distribution.

SVD of Stretches

Submitted by John Craighead on Fri, 09/17/2010 - 19:00

SVD

Singular Value Decomposition

Hello !

I have been reading quite a bit about decomposing deformation gradients into F=RU = vR where R = rigid rot'n, U = right stretch & v = left stretch. Since the principle stretch axes & basis vectors don't usually coincide, such stretches produce both stretch & shear as shown in animation at link below.

A singular value decomposition of U (or v) can be used to isolate the pure stretches. In my case, U is postive semi-definite so SVD given by eigenvalue decompostion as follows:

Coupling quantum and continuum scales to predict crack tip dislocation nucleation

Submitted by arunk on Fri, 09/17/2010 - 18:27

research

ANSYS CODE FOR FATIGUE CRACK PROPAGATION

Submitted by Amit S. Kulkarni. on Fri, 09/17/2010 - 18:20

industry

Hi all,

Currently, I am using ANSYS 12.1 for the fatigue crack propagation simulation for the edge crack & center crack plates. It is a mixed mode crack propagation.

Can anybody please tell me or guide me how to write the code in the ANSYS using APDL for automatic remeshing around the cracktip when crack propagates to the new position?

Thanks in advance. :)

ANSYS CODE FOR FATIGUE CRACK PROPAGATION

Submitted by Amit S. Kulkarni. on Fri, 09/17/2010 - 18:17

software

Hi all,

Currently, I am using ANSYS 12.1 for the fatigue crack propagation simulation for the edge crack & center crack plates. It is a mixed mode crack propagation.

Can anybody please tell me or guide me how to write the code in the ANSYS using APDL for automatic remeshing around the cracktip when crack propagates to the new position?

Thanks in advance. :)

ANSYS CODE FOR FATIGUE CRACK PROPAGATION

Submitted by Amit S. Kulkarni. on Fri, 09/17/2010 - 18:11

research

Hi all,

Currently, I am using ANSYS 12.1 for the fatigue crack propagation simulation for the edge crack & center crack plates. It is a mixed mode crack propagation.

Can anybody please tell me or guide me how to write the code in the ANSYS using APDL for automatic remeshing around the cracktip when crack propagates to the new position?

Thanks in advance. :)

ANSYS CODE FOR FATIGUE CRACK PROPAGATION

Submitted by Amit S. Kulkarni. on Fri, 09/17/2010 - 18:06

Hi all,

Can anybody tell me how to write the code in the ANSYS using APDL for automatic remeshing around the cracktip when crack propagates to the new position?

Thanks in advance. :)