Showing papers in "Engineering Failure Analysis in 2003"

TL;DR: In this article, an analytical and experimental study has been conducted to assess the effectiveness of a direct cold expansion technique on the fatigue strength of fastener holes in an aircraft construction industry to make holes more resistant to failure.

TL;DR: In this paper, a series of experiments determined the threshold stress of various bolt metallurgies (900 MPa for 1355AXRC, and 800 MPA for MAC and MA840B steels) and showed that SCC begins in rock bolts when they are sheared by moving rock strata.

TL;DR: In this paper, the authors investigated reformer tubes from a fertilizer plant made of modified HK 40 steel which failed after 4 years service and found that longitudinal cracks found in the tubes were caused by overheating because of inadequate feed flow caused by the choking of damaged catalyst.

TL;DR: In this article, the failure of a titanium reconstruction plate for osteosynthesis, which occurred during use, was investigated, and the results indicated that the premature fracture of the plate was caused by a corrosion-fatigue mechanism.

TL;DR: The cause of the damaged journals was found to be a wrong grinding process that originated small thermal fatigue cracks at the center of the journals, on both crankshafts as mentioned in this paper.

TL;DR: In this article, the failures of boiler tubes due to fireside corrosion in a waste heat recovery boiler utilizing the exhaust gas of a gas turbine fired with high-speed diesel has been analyzed.

TL;DR: In this paper, a failure investigation has been conducted on diesel engine crankshafts used in tractors and made from 0.45 % carbon steel and the failure zones were examined using the scanning electron microscope (SEM).

TL;DR: In this paper, the failure of a turbine blade of a 220 MW thermal power plant was reported, which was made of martensitic stainless steel and the structure was tempered martensite.

TL;DR: In this paper, an attempt has been made to investigate the effect of cryogenic treatment on axial fatigue performance of fillet welded cruciform joints of AISI 304L stainless steel, which failed in the weld metal.

TL;DR: In this paper, a 17-4 PH precipitation hardening stainless steel propeller shaft failed in use when installed in a sailboat working in a marine environment and the failure was caused by torsional fatigue and stress corrosion cracking (SCC).

TL;DR: In this paper, the failure of a gas turbine first stage bucket was investigated by visual inspection and finite element analysis, and the TMF cracking of surface coatings on the suction and pressure sides of the bucket was described.

TL;DR: In this article, an experimental study on the mechanical properties of Expanded Polystyrene (EPS) foam was conducted using high precision micro-force compression tests with foam specimens from actual helmets at precompression strain ranging from 10% to 50% and hot-wet conditions at 60°C with different relative humidity levels between 40% and 85%.

TL;DR: In this article, a performance analysis of roller bearings used in railway ore transportation wagons was carried out, where data from 47,000 failed bearings, divided in seven groups, were used to determine the failure distribution.

TL;DR: In this paper, the rear axle shafts of 575 DI tractors manufactured by Mahindra and Mahindras Ltd, Tractor Division, Mumbai, failed before completion of warranty period.

TL;DR: In this article, the effect of defects caused by the manufacturing process on the fatigue life of wheels subjected to block loading tests was investigated and the data have been used to assess the acceptability of defects and to estimate life under proof tests using current crack propagation models.

TL;DR: In this article, a crack initiated from the root of pits, propagated under the high longitudinal restraint at the weld stop area, through solute enriched dendrites at the welding fusion line, resulting in an intergranular mode of failure.

TL;DR: In this article, the rolling-element fatigue life of advanced hybrid material bearings consisting of silicon-nitride balls, REX20 tool-steel inner races, and CRU20 tool steel outer races was measured under well-qualified laboratory testing.

TL;DR: In this article, the authors analyzed the causes of the failure of an F-4 aircraft due to a crack in the nose landing gear hydraulic actuator cylinder and found that a large quantity of corrosive oxide was detected in the initial stage.

TL;DR: In this paper, a series of alternating bending fatigue tests using a constant load, similar to those known as BoS (bending over sheave) tests, were carried out These simulate the effective working conditions of a rescue hoist.

TL;DR: In this paper, the failure of a ball and race type coal pulverizer mill shaft was investigated and it was found that the fatigue cracks originated from the keyway area, unusually from the top edge.

TL;DR: In this paper, the failure of five shear bolts in the main rotor drive plate of a helicopter during installation torque wrenching was analyzed and it was concluded that the bolts failed because of improper application of antiseize material, which led to development of overloads.

TL;DR: Fractographic observation of commercially pure titanium plates was carried out after fatigue testing in different conditions: room temperature in air using anodised plate, serum at 37°C using non-anodized plate, and serum at 36°C plus gaseous hydrogen using anodeised plate as mentioned in this paper.

TL;DR: In this paper, liquid metal induced embrittlement (LMIE) of En19 steel was investigated by tensile testing specimens coated with liquid pure tin, and the importance of dissolution of the steel by tin on the behaviour of the specimens tested at higher temperatures was illustrated.

TL;DR: In this paper, service-exposed platen superheater and reheater tubes (148,900 h) made of 2.25Cr-1 Mo steels in a 120 MW boiler of a thermal power plant were evaluated for remnant life.

TL;DR: In this article, a case history involving this type of failure is presented, using finite element modeling the failure are analyzed and some methods to prevent the tube failure under internal pressure are recommended.

TL;DR: AISI 304-grade AISI bellows made of austenitic stainless steel were used as a conduit for liquid fuel and oxidizer in the propellant tank of a satellite launch vehicle as discussed by the authors.

TL;DR: In this article, the fundamental basis of the existing S-N curves used for North Sea applications is reviewed and the applicability in the light of research on fatigue of girth welds is considered.

TL;DR: In this article, the failure of a waterwall tube in a coal-fired boiler from a thermal power station was analyzed using stereo and optical microscopy, micro-hardness measurements and scanning electron microscopy in the secondary electron imaging and back scattered electron imaging mode.

TL;DR: In this article, the authors present the results obtained in a failure analysis study carried out in cast steel railway couplings of the trains of one coal transportation line, where a significant number of failures have occurred in these components which led to great losses and disruption of services.

TL;DR: In this article, the authors describe the hydrogen embrittlement damage of tubing made from a commercial low alloy manganese steel containing vanadium and show that the fracture occurred at complex inclusion/matrix interfaces, where the size of the inclusions that caused fracture was 2 to 5 μm.