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keyhole instability

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240221
EISBN: 978-1-62708-251-8
... test uses a V-notched specimen. Three others are the Charpy keyhole test, Charpy U-notch test, and the precracked Charpy test. The Charpy keyhole and U-notch tests are similar to the Charpy V-notch test. Only the geometry of the machined notch is different. However, since the notch is not as severe...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280323
EISBN: 978-1-62708-267-9
... structure during test so as to induce failure by a reduction in strength. (In some cases, the changes may enhance strength.) The structural changes may be termed “metallurgical instabilities,” and, while they influence all modes of failure, these instabilities are sometimes conveniently described in terms...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610101
EISBN: 978-1-62708-303-4
... an instability or other maximum load is reached before the 5% secant, the maximum load reached up to and including the possible intersection of the 5% secant is the P Q . Type II illustrated in Fig. 29 is an example of one of the other types of load-versus-displacement records. The 5% secant corresponds...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.9781627083096
EISBN: 978-1-62708-309-6
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.9781627082709
EISBN: 978-1-62708-270-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.9781627082563
EISBN: 978-1-62708-256-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
... be used on thicker sections, such as one-pass welding of titanium alloy plate up to 12.7 mm (0.5 in.) thick, using square-groove butt joints and the keyhole technique. Resistance welding, which is another fusion welding process, occurs when heat is generated by resistance to electrical current at two...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550033
EISBN: 978-1-62708-307-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... extension, and each as associated with the increment of fracture area ( dA ). Thus, dU e / dA equals dW/dA being the point of instability. That is, when dU e / dA becomes slightly larger than dW/dA , rapid crack propagation will occur, driven by release of strain energy. Otherwise, no fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.9781627082617
EISBN: 978-1-62708-261-7