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.
|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|
|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||ASME 2016 Pressure Vessels and Piping Conference, PVP 2016|
|Period||17/07/16 → 21/07/16|
- Fracture mechanics
- Fracture (Materials)
- Finite element analysis