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torsional overload

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270122
EISBN: 978-1-62708-301-0
... microscopes, was flat and shiny with deformation marks and dimples, typical of torsional overload, and signs of severe rubbing on the periphery. Based on their observations, investigators concluded that the quill shaft failed by torsional overload, the source of which could not be determined. quill...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270124
EISBN: 978-1-62708-301-0
... that a considerable amount of rubbing occurred after the shaft broke. SEM fractography revealed deformation marks and elongated dimples, typical of shear overloads, along with other details. Based on their analysis, investigators concluded that the cardan shaft failed under torsional overload. They also cited a need...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270074
EISBN: 978-1-62708-301-0
..., causing adhesive wear and the welding of slipper pad material onto the surface of a mating cam plate. Excessive friction between the slipper pads and cam plate, in turn, created a torsional overload that caused the camshaft to break. The chapter presents SEM images showing the wear pattern on one...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
... aircraft were also found failed. Also, a new bolt had failed during fitment. Investigations revealed that the five bolts had failed by SCC and the new bolt by torsional overload due to excessive torque tightening. An aircraft crashed following loss of yaw control while in full airborne flight, due...
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 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 stages...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630071
EISBN: 978-1-62708-270-9
..., and shear—are identical in pure torsion, unlike other types of loading. Figures 5 , 6 , and 7 show examples of torsional fractures. Fig. 5 Single-overload torsional fracture on the transverse shear plane of a shaft of medium-carbon steel of moderate hardness. Note that the originally straight...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
..., Part 6—Torsional Fractures , Mach. Des. , 1950 2.10. Voort G.F. Vander , Visual Examination and Light Microscopy , ASM Handbook , Vol 12 , Fractography , ASM International , 1987 , p 91 – 165 10.31399/asm.hb.v12.a0001834 2.11. Puttick K.E. , Ductile Fracture in Metals...
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 as exhaustive as one wants. A failure mode such as fracture of a component can be due to several causes. For each failure mode, all possible independent causes should be listed. Some of these causes are overload, fatigue, corrosion, stress corrosion, embrittlement, and service abnormalities. For each item...
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
... material failed by overload 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410499
EISBN: 978-1-62708-265-5
.... , Fractography of Induction-Hardened Steel Fractured in Fatigue and Overload , Mater. Charact. , Vol 39 , 1997 , p 25 – 41 10.1016/S1044-5803(97)00089-2 21.16 Ochi T. and Koyasu Y. , Strengthening of Surface Induction Hardened Parts for Automotive Shafts Subject to Torsional Load , SAE...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130087
EISBN: 978-1-62708-284-6
..., that the part was overloaded. This may be difficult to do, because exact service conditions are frequently impossible to determine with any degree of certainty. Besides service or maintenance abuse, four potential sources or origins of damage and failure relate to the product life cycle, as follows...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... torsion, rotation, beam bending, or axial loads. Specimens ( Fig. 1 ) are chosen according to the loading method employed. For example, the standard fatigue test for plastics in ASTM D 671 specifies repeat flexural stress as a standard fatigue test. In this test, a triangulated specimen geometry ( Fig. 1d...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610549
EISBN: 978-1-62708-303-4
... 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 is extremely important. When a broken component is received for examination...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050001
EISBN: 978-1-62708-311-9
...-driven timer. The output was the high voltage obtained directly from the tank voltage, and low-turn work coils could not be used. Coil designs to heat small areas were developed in many creative ways. For example, to get around overloads, a shunt coil was used. This was a coil made of copper tubing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630101
EISBN: 978-1-62708-270-9
... BEFORE STUDYING this chapter on single-overload ductile fracture, it is recommended that the reader review the first three paragraphs, at least, of Chapter 8, “Brittle Fracture,” in this book. This will give an overall perspective of the very different but closely related subjects of brittle...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... fracture—which is the result of a single overload—can be brittle, ductile, or a combination of the two. For some materials, such as relatively brittle cast iron, there may be no distinct difference between overload and fatigue appearances. These three regions are shown in Fig. 3.14(a) and (b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... examinations of fracture surfaces often reveal regions having a texture different from the region of final fracture. Fatigue, stress-corrosion, and hydrogen embrittlement fractures may also show these differences because the final failure is due to overload after the cross section is reduced by one...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... fails in tension. The fracture surface of a fatigued high-strength part is shown in Fig. 10 . The portion of the fracture surface due to fatigue crack growth and the portion finally cracked due to overload are clearly evident. Fig. 9 Typical propagation of fatigue crack. Source: Ref 8...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630081
EISBN: 978-1-62708-270-9
... mechanism. Fractures accompanied by gross deformation (ductile fracture) are caused by one of three possible failure mechanisms: monotonic ductile overload, very low cycle fatigue, or stress rupture. In contrast, fracture in the absence of gross deformation (brittle fracture) is caused by either: (1) high...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
... is dull, with a fibrous appearance. Microscopically, ductile fracture is characterized by several distinct stages ( Ref 5 – 8 ); an example is shown in Fig. 8 . In this case, an ISO 12.9 low-alloy bolt failed by ductile torsional overload. The fracture was smooth, with fracture initiating from...