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Materials 2017, 10(7), 815; https://doi.org/10.3390/ma10070815

Effects of the Crack Tip Constraint on the Fracture Assessment of an Al 5083-O Weldment for Low Temperature Applications

Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 46241, Korea
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Received: 23 June 2017 / Revised: 11 July 2017 / Accepted: 11 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue The Brittle Failure of Different Materials)
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Abstract

The constraint effect is the key issue in structural integrity assessments based on two parameter fracture mechanics (TPFM) to make a precise prediction of the load-bearing capacity of cracked structural components. In this study, a constraint-based failure assessment diagram (FAD) was used to assess the fracture behavior of an Al 5083-O weldment with various flaws at cryogenic temperature. The results were compared with those of BS 7910 Option 1 FAD, in terms of the maximum allowable stress. A series of fracture toughness tests were conducted with compact tension (CT) specimens at room and cryogenic temperatures. The Q parameter for the Al 5083-O weldment was evaluated to quantify the constraint level, which is the difference between the actual stress, and the Hutchinson-Rice-Rosengren (HRR) stress field near the crack tip. Nonlinear 3D finite element analysis was carried out to calculate the Q parameter at cryogenic temperature. Based on the experimental and numerical results, the influence of the constraint level correction on the allowable applied stress was investigated using a FAD methodology. The results showed that the constraint-based FAD procedure is essential to avoid an overly conservative allowable stress prediction in an Al 5083-O weldment with flaws. View Full-Text
Keywords: crack tip constraint; J-Q theory; aluminum alloy; cryogenic temperature; constraint-based fracture assessment crack tip constraint; J-Q theory; aluminum alloy; cryogenic temperature; constraint-based fracture assessment
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Moon, D.H.; Park, J.Y.; Kim, M.H. Effects of the Crack Tip Constraint on the Fracture Assessment of an Al 5083-O Weldment for Low Temperature Applications. Materials 2017, 10, 815.

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