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20 Sim Crack4/9/2023 Abaqus can calculate such outcomes for a crack, which can then be compared to critical values to determine whether or not a crack will propagate. Another is the J-integral, which describes how much strain energy is released per unit fracture surface area. One of these is the stress intensity factor (K), which describes how quickly the stress increases towards the crack, assuming a linear elastic material. Because the stress at a crack depends strongly on the mesh/thickness of the crack, looking at stress to determine whether a crack will propagate does not work well. Because this thickness is very small, it is difficult to measure and take into account numerically. In the real world, perfectly sharp cracks do not exist a crack will always have a finite thickness. The loading will be localised in a single element and therefore the results will depend strongly on the mesh, which is unwanted. In a simulation it is not possible to obtain an infinitely large stress. In a perfectly sharp crack, loading is applied to a single point, causing a singularity with an infinitely large stress. Simulating this requires special techniques, especially for sharp cracks. In many cases it is important to know whether a crack will propagate.
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