Hello, since you are interested in stresses in the bolt from a shock response, you should consider a realistic approach in terms of geometry and loading.
My take is you should do a pre-stress analysis to assess the contact areas around the bolt first, and ensure the head and nuts connections are...
Hello,
You may have an adjust option activated, that will displace secondary surface nodes onto the main surface. This is a strain free initialization operation.
You may want to deactivate it altogether, with adjust=no in your card.
You can also initialize you mesh position at zero initial...
Model reduction should not be considered this way. By adding coupling and trying to concentrate yours sections to central nodes, you are making assumptions on your section kinematics anyway so you're better off working with beams, that properly formalize assumptions and kinematics you are trying...
Hello,
I am not completely sure about your mass offload setup. As soon as you do not define gravity load you should have your expected conditions ?
Coming back to the mass and RBE3, RBE3 is a connection designed to transmit loads, so if you apply a load to your mass it will be transmitted...
Your simulation objective is not clear, so it is not easy for us to orient towards a good modelling strategy. By the look of your model and assuming you checked the properties, if you do not get mostly bending modes, either your section is very specific or your are looking at quite high...
Distributing coupling is the equivalent of RBE3 in NASTRAN it is a connection made to transmit loads. The constraint forces the central node (your connection point) displacement to be the average of all the master points. You can thus have a relative displacement between connected points as...
Rotation DOF have no meaning for 3D solid elements. These DOF exist in 1D and 2D elements as a mean to simplify the small dimensions. You can see them as the way of connecting the mesh nodes to the shallow structure section orientation.
ABAQUS has a shell to solid feature but it is rather...
Hello, not all formats are readable. It depends on what you want to use. If you want the mesh and the restitution basis, you will need the binary results file output.
We develop a toolbox (SDT-FEMLink) that implements such read and much more, and will let you work in MATLAB with a proper FEA...
Damping is not additive, and not linked to stiffness or mass in general. You will thus not be able to easily setup a guess without assumptions.
That said, if you are working with loss factors in structural dynamics, you can use the Modal Strain Energy assumption. It states that the synthesized...
