Evaluating the Conditions When Warm Pre-stressing does not Produce a Benefit in Apparent Toughness

Gelderen, D.G.A. Van; Booker, Julian D; Smith, David J.

doi:10.1016/j.matpr.2015.05.055

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…To facilitate straight and efficient fatigue precracking, all specimens were precracked in liquid nitrogen, as room temperature would have been too high with respect to both 77 K and 4 K, and the risk of artificially increasing toughness by the so-called warm prestressing (WPS) effect [22] would have been significant. Prior to precracking, all specimens were polished on both sides to ensure the precrack was visible past the notch.…”

Section: Fatigue Precracking At 77 K (Liquid Nitrogen)mentioning

confidence: 99%

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

Benzing

2023

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In the framework of a collaborative project between ASME, NASA, and NIST, quasi-static fracture toughness tests have been performed at liquid nitrogen temperature (77 K, or -196 °C) and liquid helium temperature (4 K, or -269 °C) on weld specimens extracted from the centers of four 316L welded stainless steel plates, each produced by a different vendor. Although the plates were produced in accordance with the same specifications from the same material (316L), large differences in fracture toughness have been observed, with the best weld (W2) exhibiting almost twice the critical toughness of the worst (W1) at 77 K (219 kJ/m2 vs. 113 kJ/m2), and about seven times the critical toughness of W1 at 4 K (146 kJ/m2 as compared to 21 kJ/m2). The Charpy absorbed energies recorded at 77 K for three of the welds within the same project were found to be strongly linearly correlated with fracture toughness at both test temperatures. The exception was weld W4, which provided the highest impact toughness and the second lowest quasi-static fracture toughness (stable crack initiation and resistance to crack propagation).

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Section: Fatigue Precracking At 77 K (Liquid Nitrogen)mentioning

confidence: 99%

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

Benzing

2023

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show abstract

“…The complete test matrix is provided in Table 4. To facilitate straight and efficient fatigue precracking, all specimens were precracked in liquid nitrogen, as room temperature would have been too high with respect to both 77 K and 4 K, and the risk of artificially increasing toughness by the so-called warm prestressing (WPS) effect [22] would have been significant. Prior to precracking, all specimens were polished on both sides to ensure the precrack was visible past the notch.…”

Section: Materials and Test Matrixmentioning

confidence: 99%

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

Benzing¹

2022

View full text Add to dashboard Cite

In the framework of a collaborative project between ASME, NASA, and NIST, quasi-static fracture toughness tests have been performed at liquid nitrogen temperature (77 K, or -196 C) and liquid helium temperature (4 K, or -269 C) on weld specimens extracted from the centers of four 316L welded stainless steel plates, each produced by a different vendor. Although the plates were produced in accordance with the same specifications from the same material (316L), large differences in fracture toughness have been observed, with the best weld (W2) exhibiting twice the critical toughness of the worst (W1) at 77 K, and more than seven times the critical toughness of W1 at 4 K. The Charpy absorbed energies recorded at 77 K for three of the welds within the same project were found to be strongly linearly correlated with fracture toughness at both test temperatures. The exception was weld W4, which provided the highest impact toughness and the second lowest quasi-static fracture toughness (stable crack initiation and resistance to crack propagation).

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“…• Benefits of WPS. When can the beneficial effects of WPS be degraded [39] For example, to what extent can limited rises in crack driving force be allowed during the cooling transient? • Fracture Mode.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…• Welding Residual Stresses. The interaction of weld residual stress and the WPS effect needs better clarification for validation of WPS assessment methods [38,39]. These stresses are generally included in the pre-load stress intensity factor in WPS models based on small-scale yielding approximations.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

‘Mind the gap’ in fitness-for-service assessment procedures-review and summary of a recent workshop

Larrosa

Ainsworth

Akid

et al. 2017

International Journal of Pressure Vessels and Piping

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'Mind the gap' in Fitness-for-Service (FFS) assessment procedures was a workshop held at The University of Manchester in June 2015. The goal of the workshop was firstly to identify 'knowledge gaps' or areas for improvement in FFS assessment procedures and, secondly, to present methodologies that have been developed to narrow these gaps. It was intended that identification of these 'gaps' would allow an understanding of the current development needs for defect tolerance arguments in the FFS assessment procedures. The following questions were addressed: 1) What are the main 'knowledge gaps' in current FFS assessment procedures and methodologies? 2) What are the main barriers that need to be overcome in order to narrow these 'gaps'? 3) What are the current procedures (if any) and why are these not useful, over-or under-conservative and what needs to be improved? 4) What research is currently ongoing in order to narrow the gaps? This paper summarises the presentations and discussions at the workshop on subjects such as environmentally assisted cracking mechanisms, creep, welding residual stresses and fracture mechanics.

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Evaluating the Conditions When Warm Pre-stressing does not Produce a Benefit in Apparent Toughness

Cited by 4 publications

References 23 publications

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

Fracture toughness tests at 77 K and 4 K on 316L stainless steel welded plates

‘Mind the gap’ in fitness-for-service assessment procedures-review and summary of a recent workshop

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