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why the mass matrix of my structure is unsymmetric?

Submitted by Yanhai on
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I'm doing an research about a cantilever which can undergoes large rotations along two directions. At the head of the cantilever there is a magnetic particle. When I establish the dynamic model for this cantilever, I just consider the mass of the particle(since the mass of the beam is small). However after I obtian the mass matrix (6 by 6, six DOFs), i found it is not symmetric. I don't know the reason. Can anyone help me? By the way, if the beam undergoes large rotation, will the stiffness matrix(tangent matrix) at each state keep symmetric ? Thank you   

Modeling of Particulate Composites

Submitted by Yogesh_Bisht on
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FEM
Composites
particulates

Hi

I am trying to model particulate composites and simulate their stress-strain response. The problem that I am facing is that the inclusions (stiffer than the matrix) are only acting as points of stress concentration. Consequently their is no strengthening and hence no apparent increase in load carrying capacity of the composite. Any help/suggestioin in this regard would be higly appreciated.

Regards 

 

 

Force-driven evolution of mesoscale structure in engineered 3D microtissues and the modulation of tissue stiffening

Submitted by ruogang zhao on
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biomechanics
biological materials
tissue mechanics
bio-MEMS
Engineered tissue

Force-driven evolution of mesoscale structure in engineered 3D microtissues and the modulation of tissue stiffening

Ruogang Zhao, Christopher S. Chen, Daniel H. Reich, Biomaterials, Vol. 35, Issue 19, June 2014, Pg 5056–5064

http://www.sciencedirect.com/science/article/pii/S0142961214001604

Abstract:

MULTISCALE QUASICONTINUUM APPROACHES FOR DISCRETE MODELS OF FIBROUS MATERIALS SUCH AS ELECTRONIC TEXTILE AND PAPER MATERIALS

Submitted by Stephane Bordas on
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multiscale
Paper
fibers
textile
QC
quasi-continuum
electronic textile
fibrous materials
fibres

http://orbilu.uni.lu/handle/10993/15356 http://orbilu.uni.lu/bitstream/10993/15356/1/Abstract_Beex_WCCM2014.pdf

Mecahnics on the behaviour of Horizontal/laterally loaded thin hollow tubes

Submitted by adarshchatra on
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Mecahnics on the behaviour of Horizontal/laterally loaded piles or pipes

Dear all,

Please give some reading material on the horizontal/laterally loaded thin hollow tube, which explains with suitable formulas to calculate circumferential/hoop stresses in the thin tube subjected to lateral/horizontal loaḍ

 

Urgent help - Contact modelling in Abaqus

Submitted by r_1159 on
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ABAQUS

Dear all

I urgently need the answer to my question. I am modelling a clapping or contact between two surfaces similar to a crack.

I have used abaqus : 1-tangential : frictionless  2-Hard contact

I wanna know what moelling approach does abaqus use for above situation ?

Does abaqsu use hertzian contac ? bilinear stiffness or what ?

Thank you

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