SYMPOSIA PAPER Published: 01 January 1988
STP27711S

Effect of Prestrain on the -Resistance Curve of HY-100 Steel

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Metal forming and welding operations can introduce residual stresses into structural components. In this study the effect of prestrain on the J-resistance (J-R) curve of subthickness specimens of HY-100 steel was investigated. Prior to testing, the specimen blanks were subjected to four levels of tensile strain up to 10% prestrain. J-resistance curves were determined for unstrained material using multiple-specimen and single-specimen techniques and for the prestrain material using the single-specimen technique. In all cases a half-thickness, full-width, three-point bend specimen geometry was used. Irregularities in the J-resistance curves were correlated with distinct features on the fracture surfaces. In particular, discontinuities in the J-R curve were correlated with the location of ridges along the crack front. The J-R curves obtained after considering the effect of these discontinuities showed a definite influence of the prestraining: the fracture toughness JIc and tearing modulus T decrease with increasing levels of prestrain, with T being more sensitive to the prestrain level than JIc.

Author Information

I, Bar-On
Worcester Polytechnic Institute, Worcester, MA
FR, Tuler
Worcester Polytechnic Institute, Worcester, MA
WM, Howerton
Failure Analysis Associates, Newton, MA
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Developed by Committee: E08
Pages: 244–258
DOI: 10.1520/STP27711S
ISBN-EB: 978-0-8031-5064-5
ISBN-13: 978-0-8031-1258-2