Applying fracture mechanics to cracked components subjected to unloading

Sam Oliver; Martyn Pavier; Mahmoud Mostafavi

doi:10.1115/PVP2016-63575

Applying fracture mechanics to cracked components subjected to unloading

Sam Oliver, Martyn Pavier, Mahmoud Mostafavi

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

1 Citation (Scopus)

527 Downloads (Pure)

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
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	https://doi.org/10.1115/PVP2016-63575
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
Country/Territory	Canada
City	Vancouver
Period	17/07/16 → 21/07/16

Keywords

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

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Oliver, S., Pavier, M., & Mostafavi, M. (2016). Applying fracture mechanics to cracked components subjected to unloading. In 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). Article V005T09A016 American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2016-63575

Oliver, Sam ; Pavier, Martyn ; Mostafavi, Mahmoud. / Applying fracture mechanics to cracked components subjected to unloading. 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 American Society of Mechanical Engineers (ASME), 2016.

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title = "Applying fracture mechanics to cracked components subjected to unloading",

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.",

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author = "Sam Oliver and Martyn Pavier and Mahmoud Mostafavi",

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Oliver, S, Pavier, M & Mostafavi, M 2016, Applying fracture mechanics to cracked components subjected to unloading. in 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), ASME 2016 Pressure Vessels and Piping Conference, PVP 2016, Vancouver, Canada, 17/07/16. https://doi.org/10.1115/PVP2016-63575

Applying fracture mechanics to cracked components subjected to unloading. / Oliver, Sam; Pavier, Martyn; Mostafavi, Mahmoud.
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 American Society of Mechanical Engineers (ASME), 2016. V005T09A016.

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

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AU - Pavier, Martyn

AU - Mostafavi, Mahmoud

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N2 - 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.

AB - 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.

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BT - ASME 2016 Pressure Vessels and Piping Conference

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T2 - ASME 2016 Pressure Vessels and Piping Conference, PVP 2016

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Oliver S, Pavier M, Mostafavi M. Applying fracture mechanics to cracked components subjected to unloading. In 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. American Society of Mechanical Engineers (ASME). 2016. V005T09A016 doi: 10.1115/PVP2016-63575

Applying fracture mechanics to cracked components subjected to unloading

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