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tensile-overload fracture

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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
... in tension. Tensile overload fracture is caused by the coalescence of microvoids in the material and is manifested as equiaxed dimples in the magnified electron fractograph. If the ductile failure is due to shear forces, for example, as in torsion fractures, the dimples will be elongated, with an open end...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
... surface indicated that cracking initiated at the outer periphery of the strut and propagated inward until overload fracture occurred. SEM imaging revealed fatigue striations along the outer periphery and dimples elsewhere, indicative of tensile overload. Based on these observations, investigators...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
... at the center and propagated slowly outward. The outer area is the region of final brittle fracture overload. Source: Ref 16.5 Fatigue Crack Growth Stage III (Overload Fracture after Fatigue) When a relatively hard material comes into contact with a softer material under pressure, different types...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270162
EISBN: 978-1-62708-301-0
... gusset plate, right-hand side Fig. CH42.8 SEM fractograph of the hat section The fracture of the strands of the control cable indicated equiaxed dimples typical of tensile overload ( Fig. CH42.9 ). Fig. CH42.9 SEM fractograph of a broken strand Fractographic examination...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270100
EISBN: 978-1-62708-301-0
... the presence of fatigue striations in the smooth region and dimpling elsewhere. Based on their findings, investigators concluded that fatigue loading initiated a crack in the universal joint that progressed with time and that the final fracture occurred due to bending tensile overload. fatigue crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270185
EISBN: 978-1-62708-301-0
...Abstract Abstract A pair of bolts on a connecting rod failed during a test run for a prototype engine. They were replaced by bolts made from a stronger material that also failed, one due to fatigue, the other by tensile overload. The fracture surfaces on all four bolts were examined using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270158
EISBN: 978-1-62708-301-0
... the individual filaments was of the cup-and-cone type with necking, indicating failure by tensile overload. In the other two strands, some of the individual filaments showed some variation in the mode of fracture. They were of the slant type. However, plastic deformation preceding fracture was observed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
...; the fracture is typically macroscopically flat and generally transverse to the direction of cyclic or fluctuating tensile stress that caused fatigue. In contrast with tensile overload fracture, which generally has more or less shear lip (slant 45° fracture) along free surfaces, propagating fatigue fractures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610549
EISBN: 978-1-62708-303-4
... to overload after the cross section is reduced by one of the crack initiation modes. Figure 4(a) shows the fracture surface of a steel tube and is an excellent example of the type of information that can be obtained by macroscopic examination. The V-shaped chevron marks and fanlike marks clearly indicate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... and macroscopic observation, the first impressions should be based on obvious visual evidence. The simplest and most important observations relate to deformation: Was the metal obviously deformed? If it was deformed prior to fracture, yielding and fracture has occurred due to one or more gross overloads...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870267
EISBN: 978-1-62708-344-7
... and operating overload, the importance of surface cleanliness and finish, and the role of inspection, testing, replacement, and repair in safe-life and fail-safe designs. Examples highlighting the benefits and potential pitfalls of proof loading tests are included as well. coaxing compressive stress...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630117
EISBN: 978-1-62708-270-9
...Abstract Abstract Fatigue fractures are generally considered the most serious type of fracture in machinery parts simply because fatigue fractures can and do occur in normal service, without excessive overloads, and under normal operating conditions. This chapter first discusses the three...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870201
EISBN: 978-1-62708-344-7
... to ensure that a valid analysis can be conducted based on the requirements of plane-strain conditions. (It is also possible to create a tiny sharp crack in brittle materials by a simple compressive overload. See, for example, Ref 9.15 .) Fig. 9.7 Compact tension specimen for fracture testing Source...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630071
EISBN: 978-1-62708-270-9
... showing orientation and elastic distribution of normal (tensile and compressive) and shear stress components in a shaft under pure (a) tension, (b) torsion, and (c) compression loading. Also shown is single-overload fracture behavior of ductile and brittle materials under these loading conditions (bottom...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... and the subsequent effect on a propagating crack. Application of a single tensile overload can extend the life of a cracked component by retarding the rate of crack advance ( Ref 13 ). This transient crack propagation behavior is often controlled by several mechanisms, including crack closure ( Ref 38...
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 μm) 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 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... on Fracture In very general terms, when crack size ( a ) in a stressed part reaches a critical size ( a cr ), the fracture process occurs almost instantaneously with complete and sudden separation of the part. This stage of final fracture is referred to as overload fracture, as discussed in more detail...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... be listed. Some of these causes are overload, fatigue, corrosion, stress corrosion, embrittlement, and service abnormalities. For each item listed in the spreadsheet, the result of the assumed failure mode on the function of that item is listed next. This helps in deciding corrective measures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130111
EISBN: 978-1-62708-284-6
... the process of crack initiation or extension. Crack extension also can be multimode over time (e.g., fatigue crack growth followed by overload). In terms of fracture appearances (or fracture modes, defined earlier in the section “Determination of Failure Mechanism” in this chapter), a general summary...