While carrying out a dynamic explicit analysis in ABAQUS for a metal forming process, I encountered a problem while defining Boundary conditions. The following message popped up:
"In an explicit analysis step, an amplitude must be referenced if nonzero displacements are specified"
In dynamic explicit analysis why would this error message be encountered? This process is related to metal forming.
When using a displacement boundary condition the default amplitude in an implicit analysis (static general) is a ramp. In an explicit analysis the default is "instantaneous", which means the object that you give the BC to "jumps" according to the vector you defined.
When you create your explicit analysis by chaning a model, which used to be solved by the static general sovler (e.g. using the replace button in the step module) and which originally used the default amplitude (ramp), you need to define a new one.
here you must review or define properly the boundary conditions of your model in terms of displacement. If your problem is not well defined, Abaqus could diverge to an infinity of solutions, and then the error message appears.
When using a displacement boundary condition the default amplitude in an implicit analysis (static general) is a ramp. In an explicit analysis the default is "instantaneous", which means the object that you give the BC to "jumps" according to the vector you defined.
When you create your explicit analysis by chaning a model, which used to be solved by the static general sovler (e.g. using the replace button in the step module) and which originally used the default amplitude (ramp), you need to define a new one.
Hi all,
I think I have the same problem. I am trying to model steel beam to column connection under impact load. this beam to column sample is connected to a rigid frame. The connection between the frame and the sample is assumed fully fixed in the modelling. What I want to do is to decrease the fixity of the frame to sample connection. If any body have any idea, I 'll be grateful for that.
Hi all,
The explicit analysis in abaqus has many bugs. one of them is amplitude. many problems were reported when using amplitude whether smooth step or not. depending on your contact and constraints abaqus explicit is abale or not to solve the problem with amplitude.
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