Analyzing thick and thin domains is quick and easy with StressCheck’s Modal & Buckling Solver module. In most cases only one element is needed through a part’s thickness for a reliable solution. The computed natural frequencies and buckling load factors exhibit superconvergence. Pre-stress conditions can be easily handled.
Modal & Buckling Solver
The Modal & Buckling Solver provides a solver and post-processing functionalities for modal analysis and bifurcation (eigenvalue) buckling. Modal and buckling analyses can be performed for both 2D planar problems (plates and beam elements) and 3D problems (shell, extrude and solid elements).
Key Features and Advantages
Modal analysis supports computation of natural frequencies and their associated mode shapes.
- Mass density may be defined as a constant or as a formula
- Mode shapes can be constrained or unconstrained, in which the first six shapes are rigid body modes
- Can specify a pre-stress for 3D problems to account for initial stress conditions
Buckling analysis supports computation of buckling load factors and their associated buckling mode shapes. Both standard and pre-load buckling options are incorporated. To perform a buckling analysis, StressCheck first solves the linear problem corresponding to the specified loads and constraints. Using the stress field computed from the linear solution, a geometric stiffness matrix is generated and used for eigenvalue computation.
- Standard buckling provides a buckling load factor for a given loading condition
- Pre-load buckling takes into account an additional fixed set of loads (for example, residual stresses) when reporting the buckling factor for applied loads
- StressCheck’s high-order elements minimize detrimental locking effects on the eigenvalue solution and promote proper simulation of mode shapes
- The element formulation permits rapid transitions from thin to thick domains
- In many cases only one element is needed through a part thickness
- Convergence information for natural frequencies and buckling load factors is reported
- No limit on number of eigenvalues to be computed
- StressCheck Handbook simplifies boundary condition influence on buckling load factor and mode shapes by allowing users to switch between support types
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“At DST Group, we have effectively used StressCheck over the last 10 years to determine accurate stress intensity factors. The results have been used to improve our residual strength and structural life estimates for aircraft in service with the Royal Australian Airforce, including C-130, P-3C and F/A-18 A/B. We have found it to be extremely easy to use and a very versatile code with which to create parametric models.
We have recently used StressCheck to obtain improved stress intensity factor solutions (Improved stress intensity factors for selected configurations in cracked plates and Improved stress intensity factors for a single corner crack at a loaded fastener hole) for five key generic configurations. These transferable parametric results have been published externally. One specific example is the non-linear contact analysis of a cracked, filled fastener hole, with both fastener and remote plate loading.”
Dr. Manfred Heller, Head
Structural & Damage Mechanics, DST Group