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Friction press

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001188
EISBN: 978-1-62708-235-8
... cutting of the middle section of the slide. The initial crack acted as a sharp notch favoring the formation of the fatigue fracture which lead to the failure of the slide. Flame cutting Friction press Thermal stresses Ck 35 Metalworking-related failures Fatigue fracture A short fracture...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001807
EISBN: 978-1-62708-241-9
... of friction coefficient on these shear stresses. Stress Distribution of Two Cylinders under Roll/Slide Contact According to Hertz theory, the complicated problem when two cylindrical bodies with their axes both lying parallel to the z -axis are pressed to come into contact by a force P per unit...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001730
EISBN: 978-1-62708-229-7
... Abstract A shaft can crack twice before it fails. A Detroit electric plant had this experience with one in a coal pulverizer. Because the first crack rewelded partially (by friction) in service, the pulverizer remained serviceable until the second crack developed. Coal pulverizers Shafts...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
..., such that the crack-face friction was zero. The analyses were further extended to include the effects of subsurface inclusions and asperity perturbations on the pitting crack ( Ref 25 ). Finally, a thorough analysis of the surface pitting crack summarized the effects of crack-face friction and lubrication pressures...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... sliding pair, except in few instances, usually produces undesirable high friction and high wear conditions due to enhanced adhesion between the polymer. Also, poor conductivity of the polymers results in elevated temperature at the polymer/polymer interface, leading to melting and rapid wear. Therefore...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006911
EISBN: 978-1-62708-395-9
... is proportional to the load pressing these two surfaces together ( Ref 3 ). The constant of proportionality can be defined as the friction coefficient, μ: (Eq 1) μ = F f F N where F f is the force of friction and F N is the normal force, or normal load ( Fig. 1 ). Fig. 1 Diagram...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001649
EISBN: 978-1-62708-234-1
... was ductile overload and that the mechanical properties of the bolts were consistent with exemplar bolts that had been supplied. After eliminating other sources of excessive load application, the most probable cause of failure was ascribed to variances between the frictional characteristics of the bolt...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001288
EISBN: 978-1-62708-215-0
... Stress Analysis Analytical The platen-supporting flange was considered a built-in cantilever beam ( Fig. 4 ). The table weight, residual stresses, and friction forces between the flange and its supporting surface are neglected in the calculation. The reaction force on the bottom of the flange...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001619
EISBN: 978-1-62708-225-9
.... The observation of surface damage associated with the crack origins supports the fretting-fatigue mechanism. The observation that cracking started at an angle of approximately 60° to the surface indicates that the shear stress, generated by the frictional loads associated with the relative motion, was important...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... in tribological applications are subjected to sliding against hard surfaces such as metals. A polymer–polymer sliding pair, except in few instances, usually produces undesirable high friction and high wear conditions due to enhanced adhesion between the polymers. Also, poor conductivity of the polymers results...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001689
EISBN: 978-1-62708-233-4
... caused property deterioration resulting in embrittlement and fracture, it was concluded that the shaft must have fractured (most probably by fatigue cracking originating at the change of section) and that heating had then taken place from friction between the rotating input shaft and the remaining part...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... Abstract Friction and wear are important when considering the operation and efficiency of components and mechanical systems. Among the different types and mechanisms of wear, adhesive wear is very serious. Adhesion results in a high coefficient of friction as well as in serious damage...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... loop, the friction energy, E d (J) (i.e., friction work), inputted in the interface can be estimated. Both E d (J) and δ S variables can be considered to quantify the wear rate. Fretting Sliding Condition Most of the research work and industrial feedback emphasize that fretting damage...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001530
EISBN: 978-1-62708-225-9
... to attract research interest. 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 The main emphasis of these research efforts has been to understand the wear and frictional mechanism involved and to improve the tribological performance of the copper-based bearing alloys. Among different copper-based alloys, leaded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0065827
EISBN: 978-1-62708-221-1
... with superior properties was initiated. The nominal composition of Fe-0.50C-0.30Mn-0.40Si-5.00Cr-2.00Mo was developed which achieved the goals of edge retention, resistance to softening under frictional heating, wear resistance, ease of heat treatment, dimensional stability in heat treatment, grindability...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... the surface and can lead to the initiation of subsurface fatigue cracks. As these cracks propagate under the repeated loads, they reach the surface and produce cavities, or pits. When sliding is superimposed on rolling, as in gear teeth, the tangential forces and thermal gradient caused by friction alter...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... vibration of the blades and the onset of impact fretting. In some turbines, a wire is threaded through holes in the outer ends of the blades to dampen down vibration. In this case, the frictional energy dissipated in the fretting process is the effective agent and may be considered one of the few cases...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001783
EISBN: 978-1-62708-241-9
... provides information on not only better materials, but also design changes intended to reduce wear and increase service life. bushing wear relative hardness aluminum bronze distortion microstructural analysis coefficient of friction AMPCO 45 (aluminum bronze) UNS 63000 D2 (high carbon, high...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... in designing as well as in failure analysis for explaining the possible reasons of a given wear failure and thus adopting the most suitable countermeasures. It is also fundamental in basic research to help focus toward the goals, such as the reduction of wear rate or the optimization of friction. Wear...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001849
EISBN: 978-1-62708-241-9
.... The rolls are properly heat treated and/or surface hardened in order to withstand the demanding working environments. Repeated loading under bending and compressive stresses, severe friction and wear under corrosive environments and at high temperatures and strain rates are some of the most frequently met...