Applying fracture mechanics to cracked components subjected to unloading

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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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 languageEnglish
Title of host publicationASME 2016 Pressure Vessels and Piping Conference
Subtitle of host publicationVolume 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
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages6
ISBN (Electronic)9780791850411
Publication statusPublished - 21 Jul 2016
EventASME 2016 Pressure Vessels and Piping Conference, PVP 2016 - Vancouver, Canada
Duration: 17 Jul 201621 Jul 2016


ConferenceASME 2016 Pressure Vessels and Piping Conference, PVP 2016


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


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