BEASY Fracture & Crack Growth 10.0r16 provides a great number of new and advanced features that will enable engineers to improve fracture analysis and crack growth simulation to provide deeper design insight. The new release not only incorporates improvements and enhancements to the core BEASY Fracture & Crack Growth software but also to the model creation and visualisation tools as well as the Finite Element System Interfaces.
This new version builds on previous BEASY versions (10.0r12 and 10.0r14) to provide a comprehensive simulation tool to predict crack behaviour
Partial Crack Growth - The crack growth algorithms have been enhanced enabling crack growth simulations to be performed automatically across a much wider range of applications. The new capability is of particular value where residual stresses exist within the structure. The residual stresses can prevent the crack opening thus reducing the Stress Intensity Factors thereby resulting in slower crack growth. As the residual stresses can vary locally within the structure (particularly if they have been applied as some form of surface treatment) this can result in parts of the crack front growing at very different rates or in some cases not growing at all along part of the crack front.
Figure 1 Crack Growth Simulation in a Gear Tooth
This development also benefits models where crack growth on part of a crack front slows as it approaches a compressive load region but there is significantly faster growth at other parts of the crack front. This is typically the case when looking at crack growth through a gear tooth for example.
The new capability can also be used when simulating multiple cracks where one crack has either slow growth or no growth at all.
In the example shown in Figure 1 a corner crack is growing in a structure where the stress intensity factor on the crack front at the lower edge is significantly less than at the upper edge thus resulting in slower crack growth in that area. This variation in SIF along the crack front drives a change in the crack growth profile which is used to create the successive crack meshes representing the crack surface.
Figure 2 The example shows the predicted successive crack growth fronts from an automatic crack growth simulation where parts of the crack grow much fast than the remainder of the crack front
Crack Growth Around Corners - This new feature enables automatic crack growth to continue where a crack is growing around a corner. For example, in the previous release when a crack grows from a stiffener into a base panel, the automatic crack growth could fail and the user would have to manually restart the simulation. In the new release, the automatic correction procedure enables crack growth to continue in more situations.
Figure 3 Automatic crack growth in an integral stiffener