Showing papers in "Engineering Failure Analysis in 1997"

TL;DR: In this article, three types of contact fatigue damage are discussed, and a number of actual examples are presented to illustrate this failure mode in practice, which can significantly reduce the load-carrying capacity of components, and may ultimately lead to complete failure of a gear.

TL;DR: The need for research into the field of structures containing both multi-site and widespread fatigue damage, topics which have recently received worldwide attention, is highlighted.

TL;DR: The de Havilland Comet I became the first commercial airliner to be powered by jet engines as mentioned in this paper, and was introduced as the flagship aircraft on the routes of the British Overseas Airways Corporation.

TL;DR: In this paper, a failure analysis of a leaf spring which failed prematurely during service was carried out using optical and scanning electron microscopy, hardness and tensile testing, and residual stress evaluation by X-ray diffraction.

TL;DR: The characteristics of the various types of contact fatigue are as follows: 1. Microscopic pits form under pure rolling contact, and irregular-shaped pits are formed under rolling-sliding contact as mentioned in this paper.

TL;DR: In this paper, the failure of vertical furnace wall tubes of a co-generation boiler was investigated and the thinned section failures were found to be due to acid attack as a consequence of hideout.

TL;DR: In this paper, the three-dimensional boundary element method and the J-integral were used to evaluate the stress intensity factors for cracks at attachment lugs, and two symmetrical quarter elliptical cracks in a straight shanked lug were investigated.

TL;DR: In this article, the effect of molten gallium on the behavior of brass alloys with different microstructures is studied and the role of plastic slip behaviour in the generation of high localized stresses and, consequently, on crack initiation is examined.

TL;DR: In this article, an extensive investigation was carried out to determine the cause of the early retirement of an in-service hoist rope, which was retired earlier than expected because it met the criteria for removal based on the number and distribution of wire breaks.

TL;DR: The failure of the MV Kurdistan demonstrates the classic combination of high stress, low toughness and defect which are required to cause initiation of a brittle failure as discussed by the authors, and the casualty illustrates the importance that secondary stresses and thermal stresses can have on the conditions which lead to failure.

TL;DR: In this article, the main mechanisms by which components in central heating systems can corrode, and indicating the factors which can increase or decrease the rates of corrosion are summarized, and three case studies of corrosion failure in heating systems are presented.

TL;DR: In this paper, the bursting of a large silo on a farm caused considerable environmental damage and cost, and the cause was misuse of the silo for vegetable slurry instead of for feed for livestock.

TL;DR: In this article, the ability of externally bonded composite (fibre glass) wraps to increase the load-carrying capacity of both damaged and undamaged concrete beams was evaluated.

TL;DR: After 204,000 h of operation, some welds in the main steam line of a thermal generating station were examined ultrasonically and a major reflector close to a butt weld in the line was found to be cracking that was 90% through-wall as mentioned in this paper.

TL;DR: In this paper, it is proposed that surface cracks trap lubricants used during the drawing process of the wires, and carburize the region during subsequent annealing, which can also be potential sites of fatigue crack initiation.

TL;DR: In this paper, the authors compared different techniques for determining the safe strength of fillet welded lap joints under eccentric shear loading and assessed the benefit of having a torsionally closed, continuous fillet welding seam.

TL;DR: In this article, a failure analysis was carried out on chains used in markedly different applications, and failure mechanisms emphasize the importance of operating the equipment within the original design parameters, and also that material integrity is fundamental to the operational life of a system.

TL;DR: In this article, the authors present a numerical simulation of the growth of these defects based on the local stresses in the vicinity of the crack edge, which is related to cracks actually found in cylinders which have leaked or failed in service.

TL;DR: In this paper, the authors focus on recent Australian applications of sensor technology to a range of structural problems involving crack growth, multiple interacting flaws, impact damage, and composite repairs, and focus on the use of sensor technologies for monitoring structural integrity.

TL;DR: In this paper, failure analysis of locally produced shoe brake blocks was carried out and a metallurgical process was designed to produce efficient brake blocks for the Nigeria Railway Corporation (NRC).

TL;DR: In this paper, the authors describe the investigation of the catastrophic failure of a raise boring machine used for underground reaming operations, which was due to the fracture of the 32 drive head bolts, 30 of which had failed as a result of corrosion induced fatigue.

TL;DR: In this article, chemical composition analysis, metallographic examination, stress calculation and fracture surface observation were performed to determine the cause and mode of the fracture in a shell after long distance transportation.

TL;DR: In this paper, the failure of pipe-to-flange joints and a sight port flange was investigated, and it was found that carbon contents were much higher than permitted for “L” grades of austenitic stainless steel.

TL;DR: In this paper, it was shown that water had entered the system in a sufficient amount to form an immiscible mixture of a water-rich phase and a butanone-rich one.

TL;DR: In this article, the influence of prolonged aging on creep embrittlement susceptibility of 1 Cr − 1 2 Mo steel was investigated, and it was found that the creep life (time to failure) of material subjected to prolonged aging [heat-affected zone (HAZ) material in the as-received state] is increased in the lower stress zone.