An assessment of the effects of prestrain on upper shelf fracture toughness
- 1 October 1986
- journal article
- research article
- Published by SAGE Publications in The Journal of Strain Analysis for Engineering Design
- Vol. 21 (4), 219-224
- https://doi.org/10.1243/03093247v214219
Abstract
The effects of prestrain on the fracture toughness of steels are examined by using a simple cumulative damage model of microvoid growth and coalescence. First the effects of a shear prestrain on the mode III toughness at a single temperature are calculated in order to obtain guidance on how best to approximate the stress—strain curve after pre-strain. Then the models are used to examine the influence of a uniaxial pre-strain on the values of mode I toughness on the upper shelf. The mode I analyses require crack tip blunting solutions, and it is demonstrated that an approximate blunting solution enables the models to be applied readily. Numerical results for various amounts of pre-strain are calculated by taking material properties typical of an A533B steel. It is found that the effects are generally small for the material properties considered.Keywords
This publication has 6 references indexed in Scilit:
- Critical fracture stress and fracture strain models for the prediction of lower and upper shelf toughness in nuclear pressure vessel steelsMetallurgical Transactions A, 1979
- Finite deformation analysis of crack-tip opening in elastic-plastic materials and implications for fractureJournal of the Mechanics and Physics of Solids, 1977
- On the influence of state of stress on ductile failure initiation in high strength steelsEngineering Fracture Mechanics, 1977
- Detection and toughness characterisation of ductile crack initiation in 316 stainless steelsInternational Journal of Fracture, 1976
- Observations of fibrous fracture modes in a prestrained low-alloy steelMetal Science, 1976
- On the relationship between critical tensile stress and fracture toughness in mild steelJournal of the Mechanics and Physics of Solids, 1973