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engineering failure

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Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006815
EISBN: 978-1-62708-329-4
... Abstract The intent of this article is to assist the failure analyst in understanding the underlying engineering design process embodied in a failed component or system. It begins with a description of the mode of failure. This is followed by a section providing information on the root cause...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001019
EISBN: 978-1-62708-217-4
... Abstract A broken aircraft crankshaft and a severely damaged main brass bearing were examined to determine whether engine failure was initiated in the bearing or in the crankshaft. The steel crankshaft failure was a classical fatigue fracture. The bearing had been subjected to extremely high...
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
... Abstract Nodular cast iron crankshafts and their main-bearing inserts were causing premature failures in engines within the first 1600 km (1000 mi) of operation. The failures were indicated by internal noise, operation at low pressure, and total seizing. Concurrent with the incidence of engine...
Image
Published: 01 December 1993
Fig. 2 Comparison of overload failures with a typical engine fracture (right). Uniaxial tensile failure on left and an overtorqued failure (combined stress state) at center. Both overload failures exhibit ductility, with plastic deformation Near the fracture regions reflected by a notable More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003502
EISBN: 978-1-62708-180-1
... Abstract This article provides assistance to a failure analyst in broadening the initial scope of the investigation of a physical engineering failure in order to identify the root cause of a problem. The engineering design process, including task clarification, conceptual design, embodiment...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0046981
EISBN: 978-1-62708-218-1
... Abstract The exhaust valve of a truck engine failed after 488 h of a 1000 h laboratory endurance test. The valve was made of 21-2 valve steel in the solution treated and aged condition and was faced with Stellite 12 alloy. The failure occurred by fracture of the underhead portion of the valve...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001552
EISBN: 978-1-62708-217-4
... of untempered martensite. Magnification 100 times; 2 pct nital. Fatigue failures in crankshafts of small engines can also be caused in other ways. For example, propeller contacts with the ground would cause internal damage, and result in thrust line misalignments. Fatigue failures have also developed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0005695
EISBN: 978-1-62708-180-1
... Abstract This article is a compilation of terms related to analysis and prevention of engineering failures. engineering failure analysis failure prevention COMMUNICATION is often the key issue in practical failure analysis. Communication is required among specific parties who...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001742
EISBN: 978-1-62708-217-4
... connecting rod Fatigue fracture The failures shown in Figs. 1 and 2 occurred in one helicopter engine model. High-cycle, low-stress fatigue fractures in bolts and arms progressed about 75 pct across the section before the final rupture. Factors involved are (1) insufficient specified preload, (2...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001418
EISBN: 978-1-62708-231-0
... the bearing material. The defect was stoned smooth, a new bearing fitted, and the engine returned to service. The engine performed satisfactorily for a further twelve months until fracture of the crankshaft through the No. 5 crank pin supervened. The fracture revealed a complex torsional fatigue failure...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001761
EISBN: 978-1-62708-241-9
... Straightness and misalignment check Abstract An investigation of a damaged crankshaft from a horizontal, six-cylinder, in-line diesel engine of a public bus was conducted after several failure cases were reported by the bus company. All crankshafts were made from forged and nitrided steel. Each...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001032
EISBN: 978-1-62708-214-3
... Abstract A Stirling engine heat pipe failed after only 2h of operation in a test situation. Cracking at the leading edge of an evaporator fin allowed air to enter the system and react with the sodium coolant. The fin was fabricated from 0.8 mm (0.03 in.) thick Inconel 600 sheet. The wick...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001037
EISBN: 978-1-62708-214-3
... of the design to eliminate the raised central section were recommended. Engine components Low-carbon steel Brittle fracture Heat treating-related failures Background Six wrist pins designed especially for a high-performance six-cylinder automotive engine failed after 4800 km (3000 mi) of normal...
Image
Published: 01 January 2002
Fig. 4 Failure of a connecting rod bolt in a diesel engine. In (a), the failed bolt is the upper one, having necked down in a nominally larger cross-sectional area. The lower bolt is another removed from the engine in unstretched condition. In (b), the stretched region of the bolt is shown More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001612
EISBN: 978-1-62708-218-1
... failures Brittle fracture Background A cooling fan fitted onto a diesel engine catastrophically failed after 103 h of operation. The field service report showed that the fan blades were cracked and mounting bolts were sheared from the mount. It was found that the spider had cracked at the OD...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001543
EISBN: 978-1-62708-218-1
... of Piston No. 2 indicate that failure was due to fatigue. Black spots are debris. 15,000├Ś. Conclusions The high temperatures developed in this engine created an environment too severe for 357 aluminum. Surfaces were so hot that the low-melting constituent melted. Then, the alloy oxidized rapidly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001417
EISBN: 978-1-62708-227-3
... in the longitudinal direction. Although the longitudinal crack preceded the transverse ones, it would appear that once initiated, the latter developed at a greater rate than the former. Diesel engines Nonmetallic inclusions Pins Steel Fatigue fracture Very few failures in general are attributable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001673
EISBN: 978-1-62708-227-3
... and copper reprecipitation. Heat exchanger tubes Marine environments Sulfides 90Cu-10Ni Intergranular corrosion The failure of a heat exchanger tube in a marine engine resulted in flooding of the vessel and subsequently sinking it. The coolant utilized in this engine was nonrecirculated...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001755
EISBN: 978-1-62708-241-9
... assembly became jammed and rendered the engine unserviceable. The balls had the shoulder impression of the outer race. It indicated that the balls were off-center and rode over the shoulder of the outer race before failure. The cage material was smeared on the balls. This may be due to jamming...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001023
EISBN: 978-1-62708-214-3
... Abstract The failure of an ATAR engine accessory angle drive gear assembly caused an engine flame-out in a Mirage III aircraft of the Royal Australian Air Force (RAAF) during a landing. Stripping of the engine revealed that the bevel gear locating splines (16 NCD 13) had failed. Visual and low...