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spring element

WARNING: THE AVERAGE FORCE USED TO ENFORCE CONTACT CONSTRAINTS AT NODE SPRING-1.86 IS 383.736E+03 TIMES LARGER THAN

I am trying to simulate and spring analysis by using concentrated force on Abaqus 6.9.

Job cannot be performed due to the following warning and error. May i know the solution!

***WARNING: THE AVERAGE FORCE USED TO ENFORCE CONTACT CONSTRAINTS AT NODE
                    SPRING-1.86 IS 383.736E+03   TIMES LARGER THAN THE
                    AVERAGE ON THE OTHER ELEMENTS IN THE MODEL.

 ***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT


Thanks 

 

ABAQUS model for special joint element and spring element

Very urgent two enquires:

1. How to model rotational spring element in order to define a curve
like M=k*(theta) where theta is the rotaional angle? It seems that
abaqus could only provide F=kx model.

 

2. there is a dashpot connector element which behaves like F=C * V
(where C is a constant), can I ask how to model F=C*(dv/dt)=C*a(where a
is the derivative of change of velocity)?

Thanks.

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