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straight-knife shearing

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... failure mode will be shear. The fractured area appears to be highly glazed, and the direction of the fracture will be from straight across the tooth to a convex shape. For example, a loaded gear and pinion set were operating at a high rate of speed when the pinion stopped instantaneously ( Fig. 32...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... of the airfoil, along a path generally parallel to the airfoil surface at the edge of the airfoil/shroud fillet radius ( Fig. 2 ). The fracture then changed direction and ran out to the z-notch noncontact face along the trailing knife-edge seal. The entire fracture surface on the pressure side was uniformly...
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
... on the inaccessible side. Pin Fasteners Pin fasteners are one-piece fasteners, either solid or tubular, that are used in assemblies in which the load is primarily shear. A malleable collar is sometimes swaged or formed on the pin to secure the joint. Special-Purpose Fasteners Special-purpose fasteners...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
... fatigue loading, revealing slip lines on surfaces associated with crack formation and growth. Arrows indicate the direction of crack growth. Original magnification: 52× Fig. 49 Light micrograph of the surface of a badly worn steel chopper knife made from an air-hardenable tool steel showing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
..., internal bursts or chevron cracks, cracks on free surfaces, cracks on die-contacted surfaces Metal-flow-related problems: for example, end grain and poor surface performance; inhomogeneous grain size; shear bands and locally weakened structures; cold shuts, folds, and laps; flow-through defects...
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
... of SCC. Proper selection of fastener materials for the service environment is essential. The substitution of a straight-threaded connection for a pipe-threaded connection is another corrective measure that has been used to reduce the stress concentrations. In one case, the use of pipe-threaded fittings...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... elongation and reduction in wall area or cross section. Such failures often are characterized as having knife-edge fracture surfaces, in the case of tubes. Figure 1(a) ( Ref 4 ) illustrates the elongation and deformation normally encountered with short-term overheating. For example, in tubes, wall thinning...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
... to the rupture, often to a knife-edge at the fracture surface, as shown in the inset in Fig. 8 . Thinning also occurs in areas of swelling adjacent to ruptures; near the rupture shown in Fig. 8 , the tube wall was 67% as thick as it was opposite the rupture, where the tube was shielded from exposure to hot...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003510
EISBN: 978-1-62708-180-1
... knife blades to a sharp cutting edge before hardening. Avoid deep scratches and tool marks. On long, delicate parallels, shafts, and so on, rough out and have pieces annealed to remove stresses before finish machining. Always use the grade or composition of steel most suitable for the work...