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stiffness

Independent control of dynamic material properties by exploiting structural hierarchy and intrinsic structural gradients

Submitted by Ramathasan The… on
research
Damping
stiffness
hierarchical materials
carbon nanotube array
Applied mechanics; Dynamics and Vibrations

Achieving high damping and stiffness is challenging in common materials because of their inter-dependent scaling. Controlling extreme mechanical waves requires synergistically enhanced damping and stiffness. We demonstrate superior damping and stiffness in vertically aligned carbon nanotube (VACNT) foams that are also independently controllable by exploiting their synthesis-tailored structural hierarchy and structural gradients. They exhibit frequency- and amplitude-dependent responses with dramatically tunable dynamic stiffness while maintaining constant damping.

Graphene is softer to bend when stretched and bent and harder to stretch when bent and moderately stretched

Submitted by Antonino Favata on
graphene
softening
hardening
stiffness
bending
stretching

 

In the attached paper, we have shown that concomitant bending and stretching, whatever their value, concur to make bending stiffness decrease; moreover, concomitant bending and stretching make the stretching stiffness (or the Young modulus) increase until the applied forces reach a threshold value, then they make it decrease. Said differently, graphene is softer to bend when stretched and bent and harder to stretch when bent and moderately stretched.

Cable bending stiffness: new test data

Submitted by Alain Cardou on
industry
cables
bending
stiffness

A new paper by Chen et al.: Experimental research on bending performance of structural cable. In: Construction and Building Materials, 15 October 2015, Vol. 96, pp. 279-288. Equivalent bending stiffness has been obtained applying a force at midspan of simply supported, about one meter long, specimens. A number of tensile force levels have been applied (including zero). Non-linear force-deflection curves are shown.

"A stiffness degradation model for cracked multidirectional laminates with cracks in multiple layers"

Submitted by paolo andrea carraro on
Composites
laminates
stiffness
degradation
cracks
crack density
crack interaction

Free download until April 7, 2015, a new model for stiffness degradation in composite laminates.

http://www.sciencedirect.com/science/article/pii/S0020768314004843

Anisotropic stiffness of isotropic material

Submitted by sykledust on
mechanician
classical elasticity
Continuum mechanics; nonlinear elasticity
tensor
stiffness

Dear colleagues,

 

Consider a simple non-linear elastic material with stress given as

σ = D(εdev) εdev + B εiso

where εdev is the norm of εdev, D is a function of εdev and B is constant. The material is isotropic since the principal directions of  σ and ε will coincide.

Non Linear Analysis Ansys

Submitted by _shyam_shankar on
mechanician
ansys
Engineering Data
stiffness

When Working on Ansys Non Linear Static Structural Analysis, I couldn't comprehen while defining and assigning material properties to corrosponding bodies.

When I give different random values for density in Engineering Data and runing the jobs parallely the results look SIMILAR for all the independent values, I couldn't fish out on what basis do the software is giving out results.

Ansys Non Linear ANALYSIS

Submitted by _shyam_shankar on
Forums
Computational Mechanics Forum
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ansys
material properties
stiffness
Non linear Analysis with Ansys
Engineering Data

When Working on Ansys Non Linear Static Structural Analysis, I couldn't comprehen while defining and assigning material properties to corrosponding bodies.

When I give different random values for density in Engineering Data and runing the jobs parallely the results look SIMILAR for all the independent values, I couldn't fish out on what basis do the software is giving out results.

Clamping with a specific stiffness in Abaqus

Submitted by schurik01 on
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ABAQUS/CAE
stiffness
clamping

Hello,

is there a simple possibility to set a boundary condition to clamp my sheet in Abaqus with a specific stiffness?

Usually you use the "encastre"-boundary condition. But I would like to give this condition a specific stiffness.

Thanks a lot for your help in advance 

Spring stiffness of a helical spring

Submitted by Biswajit Banerjee on
research
stiffness
helical spring
spring constant

Once in a while I have to find the stiffness of a spring that I get from the local hardware shop.  I usually use a formula that can be found in some books on mechanics of materials.

But the assumptions bother me a bit because the springs that I used usually underwent large deformations and I wasn't sure whether the numbers I was using were correct or not.  

To check the formula I compared its predicted k to numbers from Abaqus simulations and found reasonably good results for many situations - but not for soft springs.

Finite Element Modeling On Polymer Nanocomposite with Clay Nanofiller

Submitted by ANIL KUMAR on
research
interface
mechanical properties
stiffness

I'm doing Mtech project on Finite Element Modeling On Polymer Nanocomposite with Clay Nanofiller.  For that am using ABAQUS software,  so i need some information regarding that ABAQUS software, how to do finite element modeling of nanocomposites with nanofiller and How to prepare a code distrubution in the plate like particales in the polymer matrix with ABAQUS software. So please can any give information.

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