### Abstract

The *J*-integral is widely used as a fracture parameter for elastic-plastic materials. The *J*-integral
describes the intensity of the stress field close to the crack tip in a
power-law hardening material under a set of well-known restrictions.
This study investigates what happens when one of these restrictions is
broken, namely the requirement for no unloading to occur.

In
this work, a centre-cracked plate is subjected to a single cycle of
load in which unloading occurs. A remote tensile stress is applied, then
released, then applied again up to and beyond its initial magnitude.
The *J*-integral at each step of the analysis is calculated using
finite element analysis. Its validity as a fracture parameter at each
step is discussed with the aid of results from a strip yield analysis of
the same problem. The relevance of the results in the context of
structural integrity assessment is discussed.

Original language | English |
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Title of host publication | ASME 2016 Pressure Vessels and Piping Conference |

Subtitle of host publication | Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 24th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Electric Power Research Institute (EPRI) Creep Fatigue Workshop |

Publisher | American Society of Mechanical Engineers (ASME) |

Number of pages | 6 |

Volume | 5 |

ISBN (Electronic) | 9780791850411 |

DOIs | |

Publication status | Published - 21 Jul 2016 |

Event | ASME 2016 Pressure Vessels and Piping Conference, PVP 2016 - Vancouver, Canada Duration: 17 Jul 2016 → 21 Jul 2016 |

### Conference

Conference | ASME 2016 Pressure Vessels and Piping Conference, PVP 2016 |
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Country | Canada |

City | Vancouver |

Period | 17/07/16 → 21/07/16 |

### Fingerprint

### Keywords

- Fracture mechanics
- Fracture (Materials)
- Stress
- Hardening
- Finite element analysis
- Cycles
- Strips
- Tension

### Cite this

*ASME 2016 Pressure Vessels and Piping Conference: Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 24th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Electric Power Research Institute (EPRI) Creep Fatigue Workshop*(Vol. 5). [V005T09A016] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2016-63575