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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
... to the member. At failure, the part was receiving a second set of loads up to 103.6% of design load. Visual investigations showed rubbing and galling of the fillet. Microscopic and metallographic examination revealed beach marks on the fracture surface and evidence of cold work and secondary cracking...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001364
EISBN: 978-1-62708-215-0
... of a combustion test indicated that the compressor deposit was comprised of a 9. 8 wt% carbon and that the condenser deposit contained 8.7 wt% carbon. It was concluded that the primary cause of failure was the rubbing of the impeller against the casting and that a self-sustaining Freon fire had occurred...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001786
EISBN: 978-1-62708-241-9
... calculations) revealed areas of damage due to rubbing with evidence of cleavage fracture on the unaffected surfaces. The results of stress analysis indicated that repeated reversals of the spindle produced stresses exceeding the fatigue limit of the shaft material. These stresses led to the formation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001484
EISBN: 978-1-62708-229-7
...Abstract Abstract Fusing of the switch contacts of a boiler feed pump drive motor led to the failure of a turbine. After rubbing of most of the Ni-Cr steel LP wheels had occurred, due to the admission of water carried over with the steam, a copper-rich alloy from the interstage gland rings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047998
EISBN: 978-1-62708-225-9
... was observed. It was concluded that overheating was caused by lubricant flow was permitted by wear of the labyrinth seals. Positive rubbing seals and MIL-G-81322 grease lubricant were found to have longer life than those with the labyrinth seals and mineral-oil-paste lubricant on testing under simulated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047558
EISBN: 978-1-62708-236-5
... of fatigue that had been subjected to appreciable rubbing. The fracture appeared to be typical of rotary bending fatigue under conditions of a low nominal stress with a severe stress concentration. It appeared that the fatigue cracks initiated in the surface-weld layer. The weld deposit in the original...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001178
EISBN: 978-1-62708-235-8
... of fracture were fine-grained and had not spread by rubbing. Because the screws were electrolytically galvanized, failure resulted from “delayed fracture.” Experience has shown that this type of fracture is seen on production parts made of high-strength steels, which absorbed hydrogen during pickling...
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
...Abstract Abstract A short fracture section of a forged and normalized Ck 35 (DIN 17200) steel slide showed three distinct zones: a dark colored crystalline area, an incipient crack propagating into a far advanced, rubbed fracture surface, and a fine crystalline final break. Metallographic...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001267
EISBN: 978-1-62708-215-0
... at rub marks on the inside edge of the spring. An investigation of loads encountered in service indicated that the springs had been loaded to a large fraction of the yield strength. Redesign of the spring mechanism was recommended. Springs (elastic) Woody fracture ASTM A228 UNS K08501 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001272
EISBN: 978-1-62708-215-0
... of bolt hole. B, Crack initiation site and associated radial marks. Higher-magnification view in Fig. 9 . C, Rubbed zone. Appears as dark region in Fig. 10 . Contains crack initiation site A. Rubbed surface inclined to nonrubbed area. D, Partial set of radial marks along boundary between rubbed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001232
EISBN: 978-1-62708-233-4
... times the nominal stress can form at notches. In this sense, abrupt changes in cross-section, sharp edges, screw threads, grooves or borings, working faults such as turning or grinding grooves, surface damage such as rubbing or pressure points and stress cracks from grinding or welding 7 can act...
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
... progression markings, indicating that they had both occurred by fatigue. Fig. 6 Fracture surface of failed bearing cap Fig. 7 Close-up view of mating fracture surface to that shown in Fig. 6 . A slaglike deposit was present in the region marked “D.” Rubbing damage is evident at the edge...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001028
EISBN: 978-1-62708-214-3
... by tearing that were subsequently smeared by metal rubbing ( Fig. 9 ). Fig. 7 SEM micrographs of the right side of the outer fracture surface after opening. (a) Extent of fatigue crack propagation on the outer fracture surface, right side. 15×. (b) Shape and pattern of the thumbnail at arrow F in Fig...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... by black arrows. Rod “A” exhibited a large amount of rubbing/sliding as one broken end moved out of place and slid over the other end that was fixed in place (see Figs. 4 , 5 ). This phenomenon indicated that the Rod “A” failed first and then Rod “B” failed due to overloading. Fig. 2 Fractured Rod...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001368
EISBN: 978-1-62708-215-0
... and the 170 mm (6.5 in.) diam necked-down section of the shaft. Although the fracture surface on the necked-down section was completely destroyed by rubbing against the mating fracture surface, sufficient fracture features were present on the hub section that a failure analysis could be conducted...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001370
EISBN: 978-1-62708-215-0
..., and flat. Some portion of the fracture surface was found to have been rubbed. A cavity near the center was observed ( Fig. 3 ). The presence of corrosion deposits masked the macroscopic fracture details. After cleaning with 50% orthophosphoric acid, more macroscopic details were observed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001802
EISBN: 978-1-62708-241-9
..., fractures in torsion on a plane parallel to the maximum shear stress. Higher magnification SEM analysis of the torsional overload fracture surfaces also reveals distinctive features. Near the outer diameter (OD) of the wire, the torsional failure fracture surfaces show a large amount of rubbing, shown...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001778
EISBN: 978-1-62708-241-9
... on the static tensile load. It is important to mention that the smooth region is caused by rubbing action as the crack propagates through the section and the rough region is mainly caused by mixed-mode (ductile + cleavage) failure. The enlarged view of the fatigue zone showing striations is shown in Fig. 6(b...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001264
EISBN: 978-1-62708-215-0
.... ∼15×. The inside surface of the plate section on the nail side is shown in Fig. 3 . Note the beveled, burnished area in the final fracture zone caused by rubbing of the screw after fracture occurred. This burnishing indicates that the implant had been fractured for some time prior to its...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001033
EISBN: 978-1-62708-214-3
... was undergoing tests as part of a space power development program. After about 80 h of operation, the engine was shut down because of low power output and the detection of a slight rub between the displacer and the mating cylinder. The regenerator matrix consisted of a stack of 350 type 304 stainless steel...