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fracture control

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610303
EISBN: 978-1-62708-303-4
...Abstract Abstract Fracture control can be defined as a concerted effort to maintain operating safety without catastrophic failure by fracture. It requires an understanding of how cracks affect structural integrity and strength and the time that a crack can grow before it exceeds permissible...
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Published: 01 November 2012
Fig. 3 Key parameters for fracture control. (a) Residual strength in terms of stress. (b) Crack growth and time period when inspection can be performed. Source: Ref 1 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610263
EISBN: 978-1-62708-303-4
... is achieved, and then the top portion of the nut fractures. Fig. 8 Installation of fastener with breakaway nut to control clamp-up. Source: Ref 10 Preload Control Insufficient preload, caused by an inaccurate tightening method, is a frequent cause of bolted joint failure. There are six main...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... influence on material behavior, including fracture toughness. Chemical composition includes impurities dissolved in the matrix or present as precipitates and inclusions. There have been few systematic investigations to determine the influence of controlled alloy additions and impurity levels on fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270162
EISBN: 978-1-62708-301-0
...Abstract Abstract Several components from the tail boom of a helicopter were found fractured at a crash site, including gusset plates, the hat section near the lower yoke, and a cable that controls the pitch of the tail rotor. The components were recovered from the wreckage and taken to a lab...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270076
EISBN: 978-1-62708-301-0
... attempting to overcome certain control problems during a flight, the adaptor of one of the control pods got sheared off. A bolt connecting the adaptor to the pylon also had fractured. The bolt and the adaptor failed by overload. Use of twin suspension hooks is recommended for better flight stability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270152
EISBN: 978-1-62708-301-0
...Abstract Abstract This chapter discusses the failure of an aileron control cable in an aircraft and explains how investigators determined the cause. Based on their observations and the results of SEM fractography, investigators concluded that the cable had been damaged by a shearing tool...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270158
EISBN: 978-1-62708-301-0
...Abstract Abstract This chapter discusses the failure of a control cable on an aircraft and the findings of an investigation that followed. The cable was made of stranded steel wire that was visibly worn. All seven strands had snapped and bore evidence of corrosion, pitting, nicks, and rubbing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
... airborne flight, due to failure of shutter bolts on the rear pitch reaction control valve. Following this accident, shutter bolts on all reaction control valves of similar aircraft were inspected. During inspection, one bolt each on five shutters belonging to different aircraft were found to be fractured...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270090
EISBN: 978-1-62708-301-0
...Abstract Abstract This chapter discusses the failure of an aircraft control cable and the investigation that followed. It explains how visual examination showed that the failure occurred in a heavily worn section that runs over a pulley. Further examination under a stereoscope and in a SEM...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270100
EISBN: 978-1-62708-301-0
... of an aluminum alloy with brass bushing had fractured ( Fig. CH16.2a ). Fig. CH16.1 Starboard undercarriage door control mechanism, indicating the region of fracture of the link rod Fig. CH16.2 (a) Failed link rod and the universal joint. Arrow indicates the fracture. (b) Sketch showing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610001
EISBN: 978-1-62708-303-4
... the velocity of sound. During the postwar period, predictive models for fracture control were pursued based on earlier work by Griffith, Orowan, and Irwin. Since the paper of Griffith in 1920 and the extensions of his basic theory by Irwin and others, we have come to realize that the design of structures...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060209
EISBN: 978-1-62708-355-3
.... In particular, the tensile ductility (e.g., fracture strain), the flow stress, and cavity formation conditions should be established as a function of temperature and strain rate. A curve of ductility versus temperature or strain rate shows what degree of deformation the material can tolerate without failure...
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Published: 01 November 2012
Fig. 6 Property improvement due to inclusion control in steel. (a) Axial fatigue data. Comparison of axial fatigue data for untreated and calcium-treated rolled ASTM A516 steel. 51 mm (2 in.) thick plates tested with alternating stress ratio of 0.1. Source: Ref 3 . (b) Charpy V-notch data More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630257
EISBN: 978-1-62708-270-9
.... Many failures can be prevented by specifying proper design and appropriate material properties, along with careful attention to manufacturing and quality control procedures and with other factors. However, a fracture mechanics approach can often be used to determine the key factors leading...
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Published: 01 December 2001
Fig. 8 Stress at fracture versus strain rate in slow-strain-rate SCC tests of AZ91. The specimens were partially immersed in distilled water. Strain was controlled with a linear ramp to maintain the desired strain rate. Source: Ref 11 More
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Published: 01 April 2004
Fig. 1.29 Large-area silicon chip soldered into a metallized ceramic package using an alloy based on the Au-3Si composition. The expansion mismatch between silicon and the ceramic makes it necessary to cool the assembly at a controlled rate in order to prevent fracture of the components. More
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Published: 30 November 2013
Fig. 12 Common fracture-toughness testing setup showing the interaction of the test specimen with the control and data acquisition instruments. A crack-mouth opening displacement gage is mounted in the compact-type (C(T)) specimen. Current systems generally use servohydraulic test systems More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060239
EISBN: 978-1-62708-355-3
.... It covers the parameters and standards related to low-temperature tensile testing. The chapter discusses the factors involved in controlling test temperature. Finally, the chapter discusses the safety issues concerning the use of cooled methanol, liquid-nitrogen, and liquid helium. ceramics...
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Published: 01 November 2012
Fig. 26 General relationships between failure modes and material properties. Shaded blocks indicate properties that are influential in controlling a particular failure mode. K Ic , plane-strain fracture toughness; K ISCC , threshold stress intensity for stress-corrosion cracking. Source: Ref More