Showing papers in "Engineering Failure Analysis in 2002"

TL;DR: In this paper, the macroscopic and microscopic characteristics as well as the proposed mechanisms of Type I (high-temperature) and Type II (low temperature) hot corrosion are reviewed.

TL;DR: In this article, the authors reviewed the characteristics of tempered martensite embrittlement (TME), hydrogen embrittlements (HE), and stress corrosion cracking (SCC) in high-strength steels and found that the most useful tool for determining which of these mechanisms is responsible for a failure, under similar conditions, of structures made of AISI 4340 alloy steel.

TL;DR: In this paper, the authors used a finite element analysis to determine the temperature profile of the disc brake rotor and calculated the strain amplitude to predict the number of high-g braking cycles to failure.

TL;DR: In this article, a series of mechanical analyses were performed to identify the possible causes of the failures by examining anomalies in the mechanical behaviour of the turbine blade, and the steady-state stresses and dynamic characteristics of the blade were evaluated and synthesized in order to determine the cause of blade failures.

TL;DR: In this article, a three-dimensional finite element (FE) model is used to study details of four different loosening processes that are characterized by either complete or localized slip at the head and thread contacts.

TL;DR: In this paper, the authors analyzed three blowout attributed to high pH SCC in different oil and natural gas transmission pipelines, which occurred by the sudden propagation of longitudinal cracks at the outer surface of the pipes.

TL;DR: In this paper, the internal surface of the ACSR conductor near the fracture showed typical static deformation marks and dynamic fretting wear tangential marks, both associated with the presence of Al2O3 debris.

TL;DR: In this paper, the fracture of a turbojet engine turbine blade was investigated and it was inferred that the root cause of cracking and excessive heat damage might be attributed to eccentricity of the shaft resulting from various reasons such as misalignment, uneven wear of bearing elements and mismatch in clearance.

TL;DR: In this paper, the authors present cases of metallurgical failure analysis of two femoral compression plates and one femoral nail-plate fabricated in stainless steel, one oral maxillo-facial plate for jaw reconstruction in commercially pure titanium alloy, and several Nitinol wires.

TL;DR: In this paper, a model for the evolution of the damage was developed, supposing that the residual stresses induced by shot-peening are mainly effective in stopping microcrack propagation but not in preventing micro-crack initiation.

TL;DR: In this article, it was found that columnar grains at the blade root airfoil region were oriented unfavorably leading to poor stress rupture property in the transverse direction.

TL;DR: A steel molding of ASTM A681 developed a large crater while being fabricated on an electrical discharge machine as mentioned in this paper, probably caused by inadequate flushing of the dielectric/coolant.

TL;DR: In this article, the crankshaft of a piston engine of a transport aircraft failed during a climb and was found to fracture at the web radius region of journals 2 and 3 and progressed in the transverse direction of the shaft axis causing it to fracture.

TL;DR: In this article, a failure analysis of a broken multi-strand wire rope from a crane was performed and the fracture of the steel wires in the wire rope showed characteristics of fatigue.

TL;DR: In this article, the authors reported the experience within the ESB regarding small punch testing of various plant components including steam drums, rotors and turbine bolts, and showed that a reasonable relationship existed between the Charpy FATT and the small punch transition temperature, TSP.

TL;DR: In this article, a 2nd-stage turbine blade of a fighter plane failed due to fatigue under low cycle fatigue (LCF) conditions due to abnormally high stresses at elevated temperature.

TL;DR: In this article, a micro/hairline crack was noticed on a low speed, hollow shaft of a single stage helical gearbox during service, and the shaft was withdrawn from service because of leakage of oil.

TL;DR: In this article, the failure of a primary reformer tube in an ammonia plant was investigated and detailed metallurgical examinations indicated that the failure was due to stress corrosion cracking and both longitudinal and transverse cracks were observed at the region of fracture.

TL;DR: In this article, the effect of varying the heat treatment parameters on the mechanical properties of A357-T6 aluminum castings was studied and sixteen heat treatments were designed to minimize failures due to a heat treatment step.

TL;DR: In this article, the failure of two adjacent platen super heater tubes of a thermal power plant has been analyzed and a significant amount of oxide layer was observed in the inner side of the failed tube.

TL;DR: In this paper, the authors investigated the cause of a catastrophic failure in a six-inch diameter feedwater line leading from the economizer to the steam drum on a boiler at a private industrial power plant in the Midwest.

TL;DR: In this article, a simple method for calculating the stress intensity factors for cracks emanating from a notch under arbitrary loading is presented, and a range of examples are presented to demonstrate the accuracy of the present method.

TL;DR: In this article, a landing gear of an aircraft failed during its landing procedure due to the fracture of the outer cylinder, which is manufactured from an Al-5.7Zn-2.7Mg-0.5Cu alloy.

TL;DR: In this article, the authors presented the results of a study regarding the failure mechanisms detected in alloyed cast iron liners of marine engines, where cracks and extensive corrosion were found in the adjustment flange between the liners in the cylinder block.

TL;DR: In this paper, the results revealed that corrosive wear at the root fillet caused pitting, intense localised plastic strain and folds, leading to crack formation, and the advance of the crack took place under the successive stress repetitions to which the gear was subjected, causing the tooth to fail by fatigue.

TL;DR: In this paper, only fatigue failures which have their origin in cracks beneath the hardened layer in the core material are considered, and the fatigue tests indicate that the hardening process parameters significantly influence the fatigue lives.

TL;DR: In this paper, the effects of abrasive wear on the tensile strength of a 6-strand steel wire rope were examined against the rope discard criteria for wear stated in ISO 4309: 1990 and other selected international standards.

TL;DR: In this article, an extensive failure analysis of Cor-Ten steel has been carried out on the Brennero Highway with the aim of finding the reasons of early failures of guardrails.

TL;DR: In this article, a landing gear of an aircraft failed during landing due to the fracture of its outer cylinder attachment lug, which was manufactured from an aluminium alloy following British Specification DTD 5104 A.

TL;DR: In this article, the high temperature tensile and creep rupture properties of 1Cr-0.5Mo steels for pendent superheater tubes in a boiler of a thermal power plant after five years service exposure for 43,000 h were investigated.