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overload failure

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270107
EISBN: 978-1-62708-301-0
... rivets. All of the rivets on the failed blade were missing and sections of skin were torn from most of the rivet holes. One such rivet hole was examined in a SEM, revealing corrosion on one of the tear surfaces and dimples (characteristic of ductile overload failure) on the other. In addition, the inner...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270162
EISBN: 978-1-62708-301-0
... for closer examination. Based on their observations and the results of SEM fractography, failure analysts concluded that the gusset plates failed due to a downward bending overload in tension and that the tail rotor control cable snapped due to tensile overload. There were no indications of delayed failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270185
EISBN: 978-1-62708-301-0
... maraging steel bolts marked M-1 and M-2 are shown in Fig. CH51.3 and their fracture surfaces in Fig. CH51.4 . In bolt M-1, beach marks are seen, suggesting failure by fatigue. In bolt M-2, the fracture surface is rough and indicative of tensile overload failure. Fig. CH51.3 Failed maraging steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270172
EISBN: 978-1-62708-301-0
..., it was concluded that the fin failed in a brittle manner by overload. aircraft piston engine cooling fins SEM fractography overload failure Summary Background Testing Procedure and Results The cylinder cooling fin of a piston engine was found broken off from the engine cylinder during...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
..., with a rock candy appearance. Figure CH28.3 is a typical SEM fractograph. Fig. CH28.2 Fracture surface of bolt No. 2 showing mud cracks Fig. CH28.3 Intergranular cracks seen on the fracture surface of bolt No. 4 Bolt No. 6 showed clear indication of single torsional overload failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270078
EISBN: 978-1-62708-301-0
... stabilizer link rod and broken port stabilizer link rod Fig. CH7.2 Damage to the threads of the link rod, near the fracture surface, as a result of bending Scanning Electron Fractography Conclusion The fracture surface shows dimples characteristic of overload failure ( Fig. CH7.3...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
... failed by overload and its fracture was secondary. In an aircraft accident, it was found that the undercarriage oleo struts had fractured on both port and starboard sides. Investigation was carried out to find the nature of failures in the two struts. Figure CH23.1 shows the fractured starboard...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270128
EISBN: 978-1-62708-301-0
... at the root transition region on the convex side of the airfoil and propagating inward to a depth of 50% of the blade root cross section before giving rise to a single overload failure. The crack initiation can be traced to the corrosion pits. No tool mark or foreign object damage or flaw in the material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270100
EISBN: 978-1-62708-301-0
... showing the relatively smooth fatigue fracture region Fig. CH16.4 SEM fractograph showing fatigue striations in the region shown in Fig. CH16.3 . Fig. CH16.5 SEM fractograph of the rapid fracture region showing dimples characteristic of tensile overload failure From...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270143
EISBN: 978-1-62708-301-0
... of the blade Fig. CH33.4 Photograph showing dent marks at the crack origin The remaining portion of the fracture surface, region II ( Fig. CH33.2 ), had a fresh and rough fracture surface and a coarse crystalline appearance. The gross fractographic features were typical of overload failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270067
EISBN: 978-1-62708-301-0
... overload failure in superalloys. The fracture surface near the leading edge was discolored due to oxidation and exposure to high temperatures. Fig. CH2.1 Photograph of the failed LPTR blade Fig. CH2.2 Photograph of the LPTR blade showing (a) entire fracture surface and (b) intergranular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270076
EISBN: 978-1-62708-301-0
...Abstract Abstract An adaptor and a bolt were overloaded during a flight causing them to fracture. This chapter recounts the circumstances that led to the failure and the investigation that followed. It includes images of the fracture surfaces which show that both components failed quickly due...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610549
EISBN: 978-1-62708-303-4
... whether the crack was initiated by an inclusion, a porous region, a segregated phase, a corrosion pit, a machined notch, a forging lap, a nick, a mar, or another type of discontinuity, or was simply the result of overloading. However, the time employed in ascertaining all the circumstances of a failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... be time consuming and expensive, but they are necessary for an accurate assessment of stress levels in areas of complex geometry of some components. This type of analysis is almost essential for determining stresses caused by thermal gradients such as those found in welding. Overload failures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
... of fatigue crack area to the overload failure area was approximately 60:40. The chemical composition of the failed bolts conformed to the specifications. The cleanliness and microstructure of the steel were satisfactory. The hardness and microstructure suggested that correct heat treatment was given...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270158
EISBN: 978-1-62708-301-0
.... Based on their observations and the results of SEM fractography, investigators concluded that tensile overload was the predominate cause of failure. fractography visual examination wing control cable Summary Background Visual Examination of General Physical Features Testing Procedure...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270025
EISBN: 978-1-62708-301-0
... the crack propagation zone and a rough region indicating the final rapid overload failure. Because of longer exposure to the environment, the smooth fatigue crack propagation region appears slightly tarnished, whereas the final fracture appears relatively bright. When there are multiple fatigue crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... of as-received roll pin (200 ╬╝m) An SEM was used to examine the fracture surface of the service failure and a laboratory-created overload failure from the same lot of material. Figure 22 shows the results of the SEM examination. In this figure, the topology of the fractures was intergranular, with some...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270074
EISBN: 978-1-62708-301-0
...Abstract Abstract This chapter discusses the key findings of an investigation into the failure of an aircraft engine fuel pump. It explains how investigators came to the conclusion that metal slivers from a heavily worn spring may have interrupted the flow of lubricant to one of the slipper...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270141
EISBN: 978-1-62708-301-0
... well-defined chevron marks along the fracture surface that end in a shear lip on the convex side. Further examination using a SEM shows that the failure was due to overload. Based on these observations and the results of tensile testing and microstructural analysis, investigators concluded...