Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Muránsky, Ondrej; Hamelin, Cory J.; Hosseinzadeh, F.; Prime, Michael Bruce

doi:10.1016/j.ijpvp.2017.04.002

Title: Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Journal Article · Thu Apr 06 00:00:00 EDT 2017 · International Journal of Pressure Vessels and Piping

DOI:https://doi.org/10.1016/j.ijpvp.2017.04.002· OSTI ID:1352364

Muránsky, Ondrej ^[1];

^[1]; Hosseinzadeh, F. ^[2];

^[3]

ANSTO, Lucas Heights, NSW (Australia)
Open Univ., Milton Keynes (United Kingdom)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

An assessment of cutting-induced plasticity (CIP) is performed, by finite element (FE) prediction of the plastic strain accumulation along the cut tip when the EDM wire sections the NeT TG4 weld benchmark specimen along two cutting directions. The first direction corresponds to a conventional (C) cutting strategy, whereby the EDM wire cuts through the thickness of the weld specimen and travels in a direction transverse to the weld. The second direction corresponds to a self-equilibrating cutting (SE) strategy, whereby the EDM wire cuts across the transverse direction of the weld specimens and travels through the thickness of the plate. The cutting thus progresses simultaneously through the compression-tension-compression regions of present weld residual stress (WRS) field. This type of cutting strategy is believed to minimize the CIP by minimising residual stress redistribution during cutting, due to stress equilibration across the sectioned material. The simulated cutting procedures are conducted under a range of clamping conditions to assess whether mechanical restraint has a primary or secondary influence on CIP accumulation. Both predictions of CIP and the resultant back-calculated WRS demonstrate that (i) mechanical restraint is the primary variable influencing CIP development, and (ii) under no circumstance does a self-equilibrating cutting strategy perform significantly better than a conventional cutting approach. Furthermore, the reason that self-equilibrating cuts are not effective is illustrated by calculating the Mode I (K_I) stress intensity factor (SIF) along the cut tip, and correlating trends in K_I to CIP development.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1352364

Alternate ID(s):: OSTI ID: 1550465

Report Number(s):: LA-UR-16-22477

Journal Information:: International Journal of Pressure Vessels and Piping, Vol. 164; ISSN 0308-0161

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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