Showing papers in "Engineering Failure Analysis in 2020"

TL;DR: The gaps in the present state of knowledge and the potential research directions for FRP-strengthened structures that lead to better understanding and establishment of design guidelines are identified.

TL;DR: This work proposes a novel integrated MCDM approach by combining Fuzzy Analytical Hierarchy Process (FAHP) with the modified FBuzzy Multi-Attribute Ideal Real Comparative Analysis (modified FMAIRCA), which is computationally inexpensive and able to provide more viable decisions.

TL;DR: A comprehensive classification of the most popular steady-state based leak detection methods is carried out, based on the core methodology utilised in each technique and without emphasizing on their individual technical detailing.

TL;DR: In this paper, a hybrid intelligent model based on the feasibility of Support Vector Regression (SVR) has been developed to predict the maximum depth of pitting corrosion in oil and gas pipelines, whereas the performance of well-known meta-heuristic optimization techniques, such as Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Firefly algorithm (FFA), are considered to select optimal SVR hyper-parameters.

TL;DR: In this paper, the authors highlight the various available mitigation approaches of localized corrosion of oil and gas pipelines and discuss future challenges and research directions related to localized corrosion mainly in oil and Gas pipelines are also discussed.

TL;DR: In this paper, a review of composite material failure modes and fracture analysis for aircraft accidents is presented, highlighting the significance of the understanding of composite materials failure modes on the overall aircraft accident investigation process.

TL;DR: The structural damage and failure patterns induced by the Lesvos earthquake to masonry structures are presented to highlight the causes and weaknesses that led to damage, or the factors that prevented it, to assist the challenging task of engineering practice.

TL;DR: In this paper, a micro-CT analysis revealed microstructural features, such as the orientation of SCFs along the printing direction, the presence of enclosed voids within the extrudates of thick-layered parts, and a reduction in maximum length of SCF in thin-layer parts, which influenced the final mechanical behaviour of the printed parts.

TL;DR: In this paper, the Eulerian-Eulerian method was used to analyze the slurry flow for various particle concentrations and small volumetric flow rates, and the analysis showed that for small flow rates the pump flow is very unstable with significant backflow and intense local abrasion and as the particle concentration increases, the flow resistance increases, flow backflow increases, and local wall abrading is aggravated.

TL;DR: Variational mode decomposition (VMD) being highly adaptive, effective in attenuating mode-mixing problem, low computational time requirement and therefore it is suitable to decompose a modulated multi-component non-stationary gearbox vibration signal is utilized for demodulation and to diagnose localized gear tooth faults under real-time speed variation.

TL;DR: The core objective of this paper is to learn from the experience of the documented pipeline failures, with the purpose of building a safer and better future for the oil & gas pipeline transportation network.

TL;DR: In this paper, the authors investigated the lower coal seam entry failure mechanism under the remnant pillar by means of numerical simulations and in-situ observations, and the global model was validated by comparing the surrounding rock deformation of 3905 headgate with the in-site observation data due to the extraction of Panel 3805.

TL;DR: In this article, the design of a shell-and-tube counter-flow heat exchanger in AutoCAD software is first considered, and the system is then meshed and simulated in ANSYS 2019 software.

TL;DR: A novel approach for implementation of a digital twin for condition monitoring of a small-scale knuckle boom crane is presented and an inverse method for estimation of the weight as well as its force vector direction based on physical strain gauge measurements is implemented.

TL;DR: An innovative use of the drone-based survey for the computation of the geometry of the structure is proposed, in order to significantly reduce the time-cost expenditure of the structural assessment, without any significant lack in the accuracy of the measurements.

TL;DR: This work uses the historical operating parameters for establishing the time-dependent CDD growth of corroded pipelines based on machine learning based on data-driven machine learning.

TL;DR: The methods applied for gear tooth fault detection using vibration analysis, with an emphasis on tooth fault modelling and dynamic simulation are reviewed, with a brief discussion of the methods and models used during the past few decades.

TL;DR: Wang et al. as mentioned in this paper designed model tests according to the different water source positions and tunnel lining forms to study the collapsibility of loess and the failure behavior of metro tunnel under high-pressure water environment.

TL;DR: Wang et al. as mentioned in this paper proposed a composite support method of shotcreting, grouting anchor bolt, anchor cable, and anchor cable for a deep soft rock roadway, which can provide reference value for other similar engineering.

TL;DR: In this article, the performance of modified surfaces, which have been developed by using various surface engineering techniques to combat the slurry erosion failure in hydrodynamic turbines, is reviewed and the evaluation of enhancement in the coating characteristics (mechanical and micro-structural) as well as coating efficiency under different slurry degradation conditions are reported.

TL;DR: In this article, a highway tunnel through BCMS in Tibet, the failure modes of the tunnel were analyzed by distinct element PFC2D program, which indicated that there were three kinds of excavation failure modes in the boulder-cobble mixed tunnel, that were, small scale local damage, collapse failure of rapid development and failure of cavity rising slowly.

TL;DR: In this article, the authors present a comprehensive and up-to-date review of tribological issues related to rolling element bearings widely used in various parts (main shaft, gearbox, pitch, yaw, and generator systems) of the wind turbine.

TL;DR: In this article, an integrated experimental and numerical study is performed to investigate the deformation and fracture in aluminum matrix -car carbide particle composites, where Al-TiC and Al-B4C cylindrical specimens are fabricated by solid state sintering during hot pressing and then subjected to compression and tension tests for investigating the fracture by electron microscopy.

TL;DR: In this article, the authors present a literature review of the tribological aspects of car start-stop systems, mainly focused on the bearing crankshaft, and discuss the operating parameters associated with the engine tribological behavior.

TL;DR: In this article, the impact process, damage and failure mode, dynamic behavior, and impact resistance evaluation method of reinforced concrete (RC) piers under lateral impact loading were investigated.

TL;DR: In this article, rotating bending fatigue tests were performed on uncoated specimens and specimens coated with diamond-like carbon (DLC) in air environment, and the total stress was evaluated by the superposition of the bending stress calculated by the finite element method and the residual stress induced by the coating deposition.

TL;DR: Developing and applies a vibration based method especially suited for arch bridges to detect, locate and quantify damages in the structural components and successfully applied to identify unknown damages using only vibration data of damaged structural elements of arch bridges.

TL;DR: Wang et al. as mentioned in this paper developed a parametric asymmetric Voronoi block generation program, and the parametric modeling of laminated strata is first implemented in UDEC, then, the numerical model of roadway is established by combining the results of exploration test, microproperties calibration, tension and shear test of rockbolt, and bearing characteristics of timber.

TL;DR: In this paper, the authors provide an overview of the common modes and causes of failure of heat exchanger tubes, and effective recommendations to prevent such failures form an important part of this study.