Implicit
The examples in this section are from the Implicit class of LSTC. The presented class is is from December 2003. The copyright is with LSTC. You may check the examples separately with the menu on the left. For educational purposes the examples have to be modified to run properly. The description of the examples explains how to work with each example. The examples run with LS-DYNA970 and upwards.
AdaptiveA static load is applied to the center of an ellipsoidal dome. Shell elements are used. Nodes at the base of the dome are constrained, and included in a NODFOR output database. Adaptivity is used to automatically refine the mesh in areas of high curvature. |
Basics IA static tensile test is simulated using shell elements. One end of the specimen is constrained, while concentrated nodal loads are applied at the other end. Uniform stresses develop in the narrowed center section. |
Basics IIA static tensile test is simulated using shell elements and a nonlinear, elastic-plastic material model. One end of the specimen is constrained, while concentrated nodal loads are applied at the other end. Uniform stresses develop in the narrowed center section. |
Basics IIIA tip load is applied to a cantilevered beam made of shell elements. The tip of the beam is constrained to be rigid. |
Contact IThe rear bumper of a truck is modeled using shell elements. A solid, rigid bar is displaced into the bumper, causing plastic buckling of the support. Post-buckling response is determined. |
Contact IIA hemispherical ball of brick elements is displaced into a plate of brick elements. The plate is supported around its edges. |
EigenvalueA coarsely meshed wheel and tire assembly is 'kicked' by a brief transient load. The dynamic response of a node at the top of the tire is monitored. |
Impl Expl SwitchA cantilevered strip of shell elements is loaded using the static implicit method. The analysis type is then switched to explicit, the load is removed, and the dynamic response is simulated. The first fundamental response frequency is verified by eigenvalue analysis. |
SectionA static load is applied to the center of an ellipsoidal dome. Shell elements are used. Nodes at the base of the dome are constrained, and included in a NODFOR output database. |
Springback IA doorbeam subassembly is deformed by a rigid pole. Shell elements are used throughout, and nodal rigid bodies are used to spotweld the components of the doorbeam. The pole is displaced to deform the doorbeam, then retracted to evaluate springback. |
Springback IIThis exercise involves two simulations. First, a cantilevered strip of shell elements is loaded using a dynamic explicit simulation. An output file named dynain is created at the end of this simulation. A second, implicit simulation is then performed which reads the dynain file and computes the springback deformation. |
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