Switching between linear and non-linear analyses in StressCheck®‘s Non-Linear Solver is seamless because of our simple element library. We treat elements and model definitions separately allowing the analyst the freedom to move between linear and nonlinear analysis after model formulation. No need to start over, no need to break the chain of analysis.
True freedom through hierarchic modeling.
The Non-Linear Solver allows users to incorporate geometric and material nonlinear effects into elasticity analyses. Seamless integration with linear analysis is made possible by the hierarchic simulation structure upon which StressCheck® is formulated.
Key Features and Advantages
Four different material laws supported to represent elastic-plastic material needs:
Material nonlinear analysis supports problems for which there are changes in material properties and plasticity must be assessed. The solver incorporates both the deformation theory of plasticity (for single overload events) and the incremental theory of plasticity for simulating multiple load-unload events such as during cold-working processes. It can perform a load step analysis to determine limit load at which there is unrestricted plastic flow.
Geometric nonlinear analysis support problems undergoes large displacements (and/or strain), ensuring equilibrium is satisfied in the deformed configuration. The user can switch from the default solver to the Newton-Raphson method for cases in which there is a strong coupling between membrane and bending forces.
The General nonlinear option combines the strengths of geometric and material nonlinear analyses for problems undergoing both large deformation (and/or strains) and localized plasticity.
Material nonlinear with multi-body contact – StressCheck® also supports the solution of an assembly for which one or more parts undergo localized plasticity (e.g. fastened joints, lugs, etc.). Dual iterative approach to update contact pressures as material plasticizes.
- StressCheck®’s high-order elements are well suited for effectively and efficiently capturing non-uniform plastic boundaries as well as large structural rotations
- Transition seamlessly from a linear to a non-linear solution process by simply switching solvers
- Simple to check convergence of nonlinear analyses via StressCheck®’s hierarchic framework
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“Through the use of StressCheck® the A-10 Aircraft Structural Integrity Program’s (ASIP) Analysis Group is able to model more accurately the physics of fatigue crack propagation in critical aircraft structure. Through this tool we are able to model, analyze and predict failure of aircraft structure and then develop crucial inspection and maintenance planes to ensure the safety and sustainability of our nations warplanes. Without the analysis capability provided to us through StressCheck® we would not be able to provide accurate assessments of the A-10 structure to top USAF leadership.”
SWRI Research EngineerSouthwest Research Institute