Redistribution of Stresses During Creep-Bending of Grain-Boundary Sliding Materials
A finite-element model has been developed to examine the effect of a viscous intercrystalline boundary phase on the distribution of stresses and displacement rates during creep. In particular, the model has been applied to bending where the principal creep mechanism is assumed to be grain-boundary sliding. The model shows that the usual method of calculating the stress distribution is reasonably accurate for the very early stages of creep but it becomes increasingly inaccurate as strain proceeds. The resulting stress redistribution during creep-bending is quite different from that normally encountered.
KeywordsResidual Stress Silicon Nitride Neutral Axis Maximum Tensile Stress Stress Redistribution
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