Use of <i>R</i>-Curves for Design in the Elastic-Plastic Fracture Mechanics Regime
TL;DRAbstract
Prediction of initiation and maximum pressure was made for two geometrically similar pressure vessels with a fivefold difference in size for two choices of steel. The vessels were supposed to contain a semielliptical axial defect in the outer surface of the cylindrical section and were subjected to internal pressure. Discussion is offered on the choice of data from plane-sided or side-grooved pieces and on the definition and geometric variability of the R-curves. Use of a normalized R-curve to allow transfer of data from a sample to the structure, beyond J-controlled growth, is examined and a comparison is made of all these cases. For these examples, the main effect of the choice of toughness data is on the extent of stable growth prior to maximum load.
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Prediction of initiation and maximum pressure was made for two geometrically similar pressure vessels with a fivefold difference in size for two choices of steel. The vessels were supposed to contain a semielliptical axial defect in the outer surface of the cylindrical section and were subjected to internal pressure. Discussion is offered on the choice of data from plane-sided or side-grooved pieces and on the definition and geometric variability of the R-curves. Use of a normalized R-curve to allow transfer of data from a sample to the structure, beyond J-controlled growth, is examined and a comparison is made of all these cases. For these examples, the main effect of the choice of toughness data is on the extent of stable growth prior to maximum load.
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