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Effect of short crack on closure behavior in a 304L austenitic stainless steel
Last modified: 2013-05-03
Abstract
This paper aims to investigate the effect of crack length on closure in a 304L
austenitic stainless steel. CT specimens are initially pre-cracked under different
constant applied stress intensity factor (SIF) ranges at a load ratio of R = 0.1.
Crack closure is detected by means of a back face strain gage at different crack
lengths obtained from a progressive electric discharge machining of the crack
wake. A numerical tool is developed to analyze the load-displacement curves after
signal analysis by means of data filtering. For different applied SIF ranges, the
SIF for crack opening Kop is shown to increase with the residual crack length DC
and reaches a steady state Kop level for DC longer than 1.2 mm. An analytical
expression of the evolution of closure versus the crack length is given.
austenitic stainless steel. CT specimens are initially pre-cracked under different
constant applied stress intensity factor (SIF) ranges at a load ratio of R = 0.1.
Crack closure is detected by means of a back face strain gage at different crack
lengths obtained from a progressive electric discharge machining of the crack
wake. A numerical tool is developed to analyze the load-displacement curves after
signal analysis by means of data filtering. For different applied SIF ranges, the
SIF for crack opening Kop is shown to increase with the residual crack length DC
and reaches a steady state Kop level for DC longer than 1.2 mm. An analytical
expression of the evolution of closure versus the crack length is given.
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