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overtorquing

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001617
EISBN: 978-1-62708-227-3
... type of coupling, undue stress concentrations at some of the crack-initiation sites, and overtorquing of some couplings during installation. Recommendations on ways to prevent further failures based on these causes are discussed. Progression markings Residual stress 41255B Cu-9Al-4Fe-4Ni...
Image
Published: 01 December 1993
Fig. 2 Comparison of overload failures with a typical engine fracture (right). Uniaxial tensile failure on left and an overtorqued failure (combined stress state) at center. Both overload failures exhibit ductility, with plastic deformation Near the fracture regions reflected by a notable More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001766
EISBN: 978-1-62708-241-9
....a0003521 Introduction Metallurgical Evaluation Conclusions Failure Timeline Engineering Mechanics Analysis The primary basis for the allegation that overtorque was the sole precipitating cause of the anchor fracture was the observation of differing degrees of permanent twist evident...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001703
EISBN: 978-1-62708-227-3
... resistance. It has been demonstrated that rapid rusting is easily produced in seawater, and that pitting occurs in highly stressed locations. The stress intensification at the root of the overtorqued threads, together with the chloride environment will thus shorten the time for a crack to initiate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001015
EISBN: 978-1-62708-217-4
... investigator, on the basis of prior examination, came to the conclusion that the clamp did in fact fail prior to the accident due to overtorqueing of the tightening mechanism. Other investigators felt that the conclusion was not necessarily justified. The basic purpose of this examination was to determine...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001649
EISBN: 978-1-62708-234-1
... to the service firm. This was the only information pertaining to the assembly of the joint that was supplied. Immediately on recognition that a failure had occurred, each of the wrenches used were verified for proper calibration. Because direct overtorque was seemingly ruled out as a failure mechanism...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001760
EISBN: 978-1-62708-241-9
... overload failure overtorquing cast aluminum alloy casting pores metallurgical analysis thermomechanical fatigue strength EN 46200 (aluminum alloy AlSi8Cu3) ...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001117
EISBN: 978-1-62708-214-3
... in the hoop direction that was due to overtorquing during connection makeup. Additional testing was carried out to determine whether such a failure could occur. Couplings were torqued on pipe to levels that far exceeded design levels, without any failures. Discussion Fractographic examination clearly...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001815
EISBN: 978-1-62708-241-9
... fractures in coarse-grained material may never have been recorded as such. For instance, some of the reported fractures due to “overtorque” during repairs in the past may have been due to this statistical possibility, not being recognized as unusual character by maintenance personnel. Unfortunately, none...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001377
EISBN: 978-1-62708-215-0
... deformation close to the fracture indicates a low ductility failure. 2× Fig. 2 Comparison of overload failures with a typical engine fracture (right). Uniaxial tensile failure on left and an overtorqued failure (combined stress state) at center. Both overload failures exhibit ductility, with plastic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... were within specifications. Unused fasteners and nuts from the same batch were installed in a simulated joint in an effort to duplicate the head cracking. Overtorquing of the fasteners caused nut-thread stripping at torques of 10.2 to 11.3 N · m (90 to 100 in. · lb). Additional torque tests using...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... the same batch were installed in a simulated joint in an effort to duplicate the head cracking. Overtorquing of the fasteners caused nut-thread stripping at torques of 10.2 to 11.3 N · m (90 to 100 lbf · in.). Additional torque tests using stronger steel nuts stripped the fastener threads but did...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... aluminum-zinc alloy connector exposed to a semiindustrial atmosphere caused failure by SCC in less than one month. This connector had been overtorqued during tightening to seal the assembly for a preservice hydrostatic test. In this case, too, substitution of straight-threaded connections reduced...