research

Journal Club Theme of June 2011: Dynamic Mechanical Behavior of Advanced Structural Materials

Submitted by qwei on Fri, 05/27/2011 - 14:30

research

shock loading

high-strain rate loading

dynamic mechanical properties

ultrafine grained metals

nanocrystalline metals

Split Hopkinson Pressure bar (or Kolsky bar)

adiabatic shear band

The response of structural materials to external mechanical load may strongly depend on the rate at which the load is imposed. For example, a specimen may exhibit ductile fracture if loaded at quasi-static rate (strain rate below 1.0/s), but may show brittle fracture under impact (high-rate) loading. According to the classic monograph of Professor Marc Meyers, if the strain rate is above 100/s, it can be put into the high-strain rate regime. The mechanical behavior of structural materials under such loading conditions is dubbed dynamic.

Dynamic Auxiliary Fields for Interaction Integral

Submitted by Matin Parchei on Fri, 05/27/2011 - 12:49

Forums

Fracture Mechanics Forum

Choose a channel featured in the header of iMechanica

research

Dear friends,

I am writing an XFEM code for dynamic crack propagation and interested in using the Interaction Integral method (as in Rethore et al. (2005)) for computation of Stress Intensity Factors (SIFs). I wonder if anyone knows what kind of dynamic asymptotic crack tip auxiliary fields could be applied to the method for computation of SIFs for a dynamically propagating crack.

Regards

Matin

How to simulate compaction process of powder mettalurgy?

Submitted by gurumoorthy.s on Fri, 05/27/2011 - 10:24

Forums

Ask iMechanica

Choose a channel featured in the header of iMechanica

research

I am doing ph.d work related to powder mettalurgy

I want to simulate the compaction process ( in powder mettalurgy) by using ABAQUS.It is very essential to find a way to create a model which will behave as such as PM part.

After modeling it is next work to find the proper analysis method to do analysis by applying compressive load to study the deformation of the PM Part. In ABAQUS, Modified Drucker-Prager cap model is widely used for the compaction problems of different metals in many research papers.

I have 2 problems.

A homogenization analysis of the field theoretic approach to the quasi-continuum method

Submitted by Vikram Gavini on Thu, 05/26/2011 - 21:38

Dear Colleagues,

I wish to bring to your attention my recent work with Liping Liu on "A homogenization analysis of the field theoretic approach to the quasi-continuum method" to appear in the Journal of the Mechanics and Physics of Solids. Below is the abstract and attached is the preprint of the article. I will very much appreciate your comments and suggestions.

A Homogenization Analysis of the Field Theoretic Approach to the Quasi-Continuum Method

An efficient GDQ model for vibration analysis of a MWNT on Pasternak foundation with general boundary conditions

Submitted by Payam Soltani on Wed, 05/25/2011 - 06:48

research

Biomaterials; Biomechanics; Nanotechnology; Composites; Biomimetics

By: Payam Soltani; P. Bahar & A. Farshidianfar

How to deal with noisy data in a mesh free Galerkin method

Submitted by Micah Paul on Mon, 05/23/2011 - 18:03

Forums

Computational Mechanics Forum

Choose a channel featured in the header of iMechanica

research

Free Tags

fluid mechanics

computational mechanics

Element-free Galerkin method

PTV

natural neighbor

I'm currently working with a particle tracking velocimetry method, specifically trying to extract shear and vorticity data from the non-gridded velocity results. Of several methods used, the most efficient and accurate was based on a non-Sibsonian element free method. Unlike a more typical Galerkin problem which finds displacements by solving a PDE, this method uses the displacements of natural neighbors to find local flow gradients.