Showing papers in "Engineering Failure Analysis in 2013"

TL;DR: In this article, the seismic behavior of masonry churches damaged during the 2009 L’Aquila earthquake is studied, and four important basilicas are considered in order to derive general conclusions from the damage assessment and the performance analysis.

TL;DR: In this paper, the behavior of one-way square reinforced concrete (RC) slabs subjected to a blast load through experiments and numerical simulations is investigated and different damage levels and modes are observed.

TL;DR: In this paper, the structural mechanics of wind turbine blades were analyzed with behavioral models to identify the mechanisms of the damage, which can help prevent similar engineering incidents in the future and provide a reference for stakeholders devising strategies for improving risk management and disaster prevention.

TL;DR: In this paper, the authors analyzed the failure pressure of line pipes with or without corrosion defects, and focus on the high strength steels, based on von Mises strength failure criterion, theoretically deduced with the strain hardening material.

TL;DR: In this paper, the authors present a comprehensive study of the die and mold repairing industries and assist the selection of the most appropriate process depending upon the availability of resources with thorough knowledge of the advantages and limitations.

TL;DR: In this paper, the authors have studied HIC behavior in pipeline steels using analysis of hydrogen permeation, hydrogen discharge using microprint technique, HIC standard test and their correlation with microstructure, type and morphology of inclusions.

TL;DR: In this paper, a new method is presented for calculating the gear mesh stiffness for a propagating crack in the tooth root, which can be used to assess the status of tooth damage and by increasing the accuracy of the calculated mesh stiffness, dynamic simulations of a gear can be improved.

TL;DR: In this paper, structural performance analysis of industrial buildings was carried out during field surveys, focusing on production plants, with two main events of local magnitude M L 5.9 and 5.8 occurring in the Emilia Region of Northern Italy.

TL;DR: In this article, a performance-based assessment procedure is proposed on the basis of Italian guidelines for seismic risk mitigation of cultural heritage, in order to support the interpretation of observed damage, which could be used for small-to-medium size artworks such as museum contents, historic archives and libraries, and archaeological elements.

TL;DR: This paper researches on the phonation principle of the pipeline leakage and the characteristic of the sound source, and the sound field is established on the basis of aero acoustics to improve detection ability of small leakage with low false alarm rate.

TL;DR: In this paper, the authors presented an overview of the damage that was observed over the course of a 2-day reconnaissance trip that took place 2 weeks after the 2011 Spanish earthquake, focusing on the damage observed in both historical and recent constructions.

TL;DR: In this paper, the effects of a crack on the cantilever steel beam with circular cross section were investigated and a finite element method (FEA) software was used in developing the model.

TL;DR: In this paper, a 2D finite element method with principle of linear elastic fracture mechanics is adopted to carry out crack propagation path studies for gear pair with different contact ratio, and a comparative study has been carried out to reflect the change in the total effective gear mesh stiffness caused by assumed straight line vs. curved crack path approximation for varying crack levels.

TL;DR: In this paper, a mesh stiffness model of internal gear pair with a tooth root crack in the ring gear is derived based on the potential energy principle, which is incorporated into the dynamic model of a one-stage planetary gear set with 21-degree-of-freedom (DOF) to investigate the effect of the internal gear tooth root cracks.

TL;DR: In this article, a grey relational analysis (GRA) and decision-making trial and evaluation laboratory (DEMATEL) method is proposed to rank the risk of failure, wherein the GRA is used to modify RPN values to lower duplications and the ordered weighted rule is followed; then, the DEMATEL method is applied to examine the direct and indirect relationships between failure modes and CFs, giving higher priority when a single CF causes FMs to occur multiple times.

TL;DR: In this paper, the authors proposed a cumulative reduction index (CRI) which uses a variable crack intersection angle to study the effect of different gear parameters on total time varying mesh stiffness.

TL;DR: In this paper, an experimental methodology based on conventional photo-elasticity technique for computing stress intensity factor (SIF) for cracked spur gear tooth is presented for different single tooth contact position and crack length.

TL;DR: In this article, a finite element analysis of hoisting rope and three-layered strand for the exploration of fretting fatigue parameters and stress distributions on the cross-section is presented. And the Archard's wear law based evolution of the fretting wear depth of wires crossed at different angles and implications to fatigue life estimations of fretted wires are presented.

TL;DR: In this paper, the authors investigated the correlation between absorbed, released and acoustic emission energies, and obtained the complete load vs displacement curves up to complete failure, evidencing very different post-peak responses by varying the material, even for the same size and slenderness.

TL;DR: In this paper, three masonry churches collapsed or severely injured during the 20-29 May 2012 earthquakes occurred in Emilia-Romagna, Italy are analyzed in detail from a numerical standpoint.

TL;DR: In this article, the authors investigated the damage character of reinforced concrete beams under close-in blast loading through experiments and showed that the spallation area increases with the decrease of the scaled distance.

TL;DR: In this paper, simulated acid rain attack led to the gradual decomposition of cement hydration products such as Ca(OH) 2, calcium silicate (C-S-H) gel, x CaO·Al 2 O 3 ⋅ y H 2 O (C x AH y ) and ettringite.

TL;DR: In this article, the authors studied the impact of the 2011 Tabanli and Edremit earthquakes on different types of structures and their failures and seismic performance, through detailed explanation of damage mechanisms.

TL;DR: In this article, the authors proposed a mathematical optimization model to derive optimal number and degrees of preventive repairs to minimize the service provider's servicing cost, and provided some guidelines to help the extended warranty provider to design flexible extended warranty contracts and determine their corresponding optimal maintenance strategies.

TL;DR: In this article, an ICE3 high speed train rated for 330 km/h service speed derailed during departure from Cologne, Central Station, Germany, due to fatigue failure of one of the driving axles.

TL;DR: In this article, a probabilistic model capable to model chloride ingress is presented, which simulates the Fick's diffusion process considering time-dependent effects, and the probability of failure is calculated using Monte Carlo simulation and the first order reliability method with a direct coupling approach.

TL;DR: In this paper, a number of 81 and 18 wind turbines of working life ranging between 6.5 and 1.35m were completely visually scanned and different damages were classified and allocated in their exact position relative to the blade length.

TL;DR: In this paper, the authors present the results of research on fatigue properties in a small number of cycles to failure of high-chromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel designed for the casts working under the so-called supercritical parameters.

TL;DR: Corrosion fatigue behavior of a medium strength structural material was studied in air and in 3.5% NaCl solution as discussed by the authors, where emphasis was placed on the study of corrosion pit formation and the development of cracks from pits.

TL;DR: In this article, the authors show that failure probability will increase sharply with wind speed in an extreme value statistical dependency, such as a reverse Weibull distribution, suggesting that outage data from normal operation of an electrical grid may be used to gauge system vulnerability to extreme fire weather conditions.