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Tension in Non - linear springs - How do I measure it?

Submitted by bharathkoya on
research

Dear sir,



I am modeling ligament structures in the knee joint finite element model
with non-linear springs and I am successfully getting non-linear
displacement curve.



My only problem is with the calculation of tension in the springs. I
have a set of non-linear springs representing a particular ligament in
the joint, which is having an elongation when I apply the forces on the
joint. I am giving pre-load to the springs so that they do not have any
slack in them before the analysis. I am also specifying the stiffness of

PhD position at RMIT, University

Submitted by hillssurrey on
job
One Ph.D. student position is available at the Centre for Innovative Structures and Materials RMIT
University. The research topic is about computational mechnaics and structural topology optimisation. It is expected to enroll in the end of this Auguest.

One Ph.D. student position is available at the Centre for Innovative Structures and Materials  RMIT, University. The research topic is about computational mechnaics and structural topology optimisation. It is expected to enroll in the end of this Auguest. More details please contact with e89817 [at] rmit.edu.au

PhD position at RMIT, University

Submitted by hillssurrey on
education
University
PhD position at RMIT

One Ph.D. student position is available at the Centre for Innovative Structures and Materials  RMIT, University. The research topic is about computational mechnaics and structural topology optimisation. It is expected to enroll in the end of this Auguest. More details please contact with e89817 [at] rmit.edu.au

Many mechanicians will receive awards from ASME.

Submitted by Jianliang Xiao on

Many people from mechnaics community will receive prestigious awards from ASME this year.

Ted Belytschko will receive the ASME Honorary Membership;

Wei Cai will receive the Tom Hughes Young Investigator Medal;

T.W. Chou will receive the Nadai Medal;

Richard Christensen will receive the Timoshenko Medal;

Normal Fleck will receive the Koiter Medal;

Yonggang Huang will receive the Drucker Medal;

Sia Nemat-Nasser will receive the ASME Medal;

Ting Zhu and Vicky Nguyen will receive the Sia Nemat-Nasser early career medal.

Convergence of a Solution

Submitted by mohammedlamine on
research

 

The Solution of a Differential Equation or a Set of Differential Equations Converges vers the Exact if it is Consistant and it is Stable : Lax's Theorem. Since the Exact is not always known it is convenient to apply this Theorem. Numerical instabilities are a result of Roundoff errors and Truncation errors. The Domain of Stability can be obtained from a Von Newman analysis in the Complex domain. This implies a condition (relation) between the variation steps. 

 

Mohammed Lamine 

Temp_disp_elements

Submitted by vbajpai007 on

Dear All,

I am trying to simulate a milling operation with temperature. This is a 3-D simulation. I am using C3D8T element type. It has 1,2,3 and 11 degree of freedom. Can you please help me in choosing an other solid element type which has additional 4,5 and 6 degree of freedom. Therefore, I need a solid element type with 1,2,3,4,5,6 and 11 degree of freedome. I get this warning:  ***WARNING: DEGREE OF FREEDOM 4 IS NOT ACTIVE ON NODE 14 INSTANCE WORK-1 - 

             THIS BOUNDARY CONDITION IS IGNORED

Thanks

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