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Bearing caps

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001198
EISBN: 978-1-62708-221-1
...Abstract Abstract Cast iron bearing caps in tractor engines fractured repeatedly after only short operating periods. The fracture originated in a cast-in groove and ran approximately radially to the shaft axis. The smallest cross section was at the point of fracture. The core structure...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001377
EISBN: 978-1-62708-215-0
...Abstract Abstract Sudden and unexplained bearing cap bolt fractures were experienced with reduced-shank design bolts fabricated from 42 CrMo 4 steel, quenched and tempered to a nominal hardness of 38 to 40 HRC. Fractographic analysis provided evidence favoring stress-corrosion cracking...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048592
EISBN: 978-1-62708-218-1
... showed three of four bearing caps, two cap screws, and one universal-joint spider had fractured. Examination of the three fractured bearing caps and the spider showed no evidence of fatigue but showed that fracture occurred in a brittle manner. The bearing cap that was not destroyed still contained...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001630
EISBN: 978-1-62708-236-5
...Abstract Abstract On 22 Feb 1997, one of the arms on an amusement park ride became detached from the central pylon, allowing the passenger carriage at the end of the arm to fall to the ground. Detachment of the arm was found to have occurred as a result of fracture of the cast steel bearing cap...
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
... failure. 4× Investigation Visual examination of the assembly showed that three of four bearing caps, two cap screws, and one universal-joint spider had fractured. Examination of the three fractured bearing caps and the spider showed no evidence of fatigue, but showed that fracture occurred...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089646
EISBN: 978-1-62708-235-8
... of cope versus drag areas. This evidence confirms the cause of crankshaft and crankshaft-bearing failures. The ferrite caps (burrs) can shear the lubricating oil film. Also, the burrs can actually penetrate the bearing-insert material. In either case, the net result is failure of the crankshaft...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001759
EISBN: 978-1-62708-241-9
... of bearing cup is also found invalid based on the measurements of hardness values of the samples selected. Through hardening of bearing cap is found as valid based on metallurgical analyses of the failed and ok sample. Bearing cup inner diameter and outer diameter were found to be ok as per specification...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... of the crankcase. The center three bearing halves sustained greater damage than the end halves. Fig. 14 Bearing halves (a) that failed by fatigue resulting from localized overloading after bearing cap shifted position. (b) Note the damaged areas (arrows A and B) on diametrically opposite sides...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001099
EISBN: 978-1-62708-214-3
... the bottoms of countersunk recesses machined into the aluminum diffuser plate. During disassembly to correct the bearing failure, two of the eight 3 8 in. diam alloy steel hexagonal socket-head cap screws (16 threads/in., 3 in. long, 1 1 2 ; in. threaded portion) fractured...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... #4: Torsional Vibration on a Reciprocating Pump Case #5: Ghosts Case #6: Vibration of Nuclear Magnetic Resonance Machine Case #7: Vibration Induced by Sound Case #8: Machine Tool Vibration Case #9: Extremely High Levels of Vibration on the End Cap of a Large Pipe Case #10: Vibration...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001098
EISBN: 978-1-62708-214-3
...Abstract Abstract Six ASTM A-574 steel cap screws from a hydraulic coupling failed after 3 months in service. The screws were replacements for smaller-diameter cap screws that had been installed during an outage. Six new cap screws were examined along with the failed screws. Eight fracture...
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
... sometimes subjected to vibratory stresses. Apart from wear by bearings, which can be a major contributor to shaft failure (see the section “Wear” in this article), the most common cause of shaft failure is metal fatigue. Fatigue is a weakest link phenomenon; hence, failures start at the most...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
.... [ 2 ]. In many cases, residual stresses are detrimental to material performance in the sense that they affect the load bearing capability of the material. Hence, it becomes essential to measure any locked-in stresses stored in the material after welding process. Residual stress measurement was carried...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
...Abstract Abstract Overload failures refer to the ductile or brittle fracture of a material when stresses exceed the load-bearing capacity of a material. This article reviews some mechanistic aspects of ductile and brittle crack propagation, including a discussion on mixed-mode cracking, which...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... stress concentration OVERLOAD FAILURES, from the perspective of materials failure analysts, refer to the ductile or brittle fracture of a material when stresses exceed the load-bearing capacity of the material from either excessive applied stress or degradation of the load-bearing capacity...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003554
EISBN: 978-1-62708-180-1
...). In an investigation of a series of failures of diesel locomotive axles, it was found that the cause was LMIE by the lead-base Babbitt metal in the traction motor suspension bearings ( Ref 17 ). The Babbitt was a Pb-Sb-Sn alloy. Due to loss of lubrication, the bearings heated to a temperature above the Babbitt melting...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006786
EISBN: 978-1-62708-295-2
... be pointed out that alloys of these embrittler metals can also be embrittling. In fact, for service failures, the embrittling metal is probably not pure but is impure or an alloy. For example, tin- and lead-base bearing alloys and solders also cause metal-induced embrittlement. Furthermore, some alloy...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
..., whereas the cylinder of the seized valve (b) had much retained austenite that transformed to martensite in service, resulting in size distortion (growth). 500× Fig. 12 Part substitution that resulted in a distortion failure. (a) Distorted commercial cap screw that was used as a replacement...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... by buckling-induced fracture. (c) Low-cycle fatigue fracture. Source: Ref 9 Fig. 12 Part substitution that resulted in a distortion failure. (a) Distorted commercial cap screw that was used as a replacement for a hardened bolt. (b) Carry-handle flange that broke because the cap screw bent. (c...
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
... decreases as hardness increases. When two materials with two different hardness materials slide on one another, the coefficient of friction depends mainly on shear strength, yield strength, and hardness of the materials [ 1 ]. Good toughness and hardness of the tool steel is needed to crimp the nylon caps...