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Hi, I am already aware of the problems/limitations of tet 4s and always use tet10s, but thanks anyway. I am in full agreement with keeping it simple, because if you do not understand the answer you get then you have no chance with a more complex solution. People forget that FE does not replace...

Hi Corus, I think I have now solved my problem. You are correct the problem was due to rigid body motion which I have overcome using dof springs (celas) elements with very low stiffness values. I also removed the physical gap in the model therefore the gap elements now connect co-incident nodes...

Thanks, I will try using hexa elements rather than tets and changing my model such that there is no physical gap. I do not understand why you need to use 'prescibed' displacements (which are presume is the same as enforced displacemens), and then subsequently remove them. Is the purpose of this...

Maybe I did not explain myself correctly. Imagine a blind hole is a solid part (tet elements). A solid tet element pin/bar is inserted into the hole and a shear force is applied to the end onf the pin/bar. This will result in a moment and shear load being reacted within the hole. The resultant...

Hi All, I have modelled a circular pin in a part with a clearance hole using solid elements in Nastran for windows. The pin is subject to a offset shear load which results in a shear and moment being applied to the hole. I am trying to model the resultant connection between the two parts using...

Hi All, I have tried to import a Cadds5 part into Patran 2001. I only have the _pd file. When I try to import this Patran replied this is an invlid file. I know Cadds5 stores lots of other files in a unique directory for each part created. Do I need the cotents of the directory?. Any help would...

Hi All, I have tried to import a Cadds5 part into Patran 2001. I only have the _pd file. When I try to import this Patran replied this is an invlid file. I know Cadds5 stores lots of other files in a unique directory for each part created. Do I need the cotents of the directory?. Any help would...

Hi Gents, I today experienced the benefit of adding shell elements to the surface nodes of a solid mesh for Fatigue analysis purposes. I am currently investigating the fatigue life of a machined fitting which I meshed using Tet10 elements. Obviously I am only interested in the magnitude of the...

Hi all, What is the best way of modelling rivets in relatively thin plates in order to obtain the correct load transfer for joints such as a multi-rivet lap joint?. I have previously used various methods such as beam and celas/rigid elements and compared these with hand-calcs but the best I...