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Engineering failure analysis
Elsevier Science
Engineering failure analysis

Elsevier Science

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Engineering failure analysis/Journal Engineering failure analysisSCIEIISTP
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    Cracking failure analysis of steel piston forging die

    Zhenwei W.Jianping W.Xingquan Z.Changwen H....
    10页
    查看更多>>摘要：? 2022 Elsevier LtdThe steel piston forging die used in an enterprise prematurely lost its function due to the corner crack at the bottom of die cavity. In order to determine the cause of the cracking, the structure of the crack was observed with optical light microscope. The fracture morphology was examined by scanning electron microscopy (SEM) method. Micro-hardness was also tested to assess the mechanical property of the die material. Furthermore, stress distribution in the die during forging was evaluated by finite element analysis (FEA) method. The investigation shows the uneven distribution of carbides in the die material is the main reason for premature failure of die, and the material oxidation at the high temperature and the coarse grain also reduce the ability of material resistance to fracture failure. The stress concentration decreases further the material endure to the fatigue load resulting from the strong impact and thermal loading during forging.
      原文链接:
    • NSTL
    • Elsevier

    Quality reliability analysis of flash welding joint of cold-rolled 50JW800 silicon steel strip

    Xu Y.Yang B.Shi Y.Feng X....
    10页
    查看更多>>摘要：? 2022 Elsevier LtdIn this study, the quality reliability of the flash butt welding (FBW) joint of a 50JW800 silicon steel strip is analyzed through metallographic observation, cupping tests, and tensile tests. It is found that the recrystallization in some areas of the joint is insufficient, as is the mechanically forced connection, owing to the plastic deformation and uneven heat distribution of the joint during the process of FBW. Insufficient recrystallization is the root cause of strip breakage during cold rolling. The quality reliability of the 50JW800 silicon steel strip FBW joint is also analyzed using eddy current nondestructive testing technology. It is found that the eddy current testing signal has a good response to different structural characteristics of the joint. Therefore, eddy current test technology can be used to ensure the quality reliability of silicon steel strip FBW joints in actual production.
      原文链接:
    • NSTL
    • Elsevier

    Evaluation of failure risk for prestressed anchor cables based on the AHP-ideal point method: An engineering application

    Zhu H.Xiang Q.Luo B.Du Y....
    12页
    查看更多>>摘要：? 2022 Elsevier LtdThis research is focused on the evaluation method of failure risk of prestressed anchor cable, and an accurate evaluation method with a simple operation is proposed. The analytic hierarchy process are used to determine the weight of each evaluation element, the closeness degree of each indicator is determined based on ideal point method. The results show the following: (1) the evaluation method better integrates the effects of multiple factors on the failure risk of the prestressed anchor cable, and the evaluation results are accurate and consistent with the actual situation of the project; (2) the evaluation result is intuitive, and the correlation degree obtained can not only reflect the failure risk grade of prestressed anchor cable, but also the possibility of deterioration of the failure risk of the evaluated anchor cable to a higher level could be obtained; and (3) the rationality and practicability is verified by comparison with field situation and other several methods. In addition, this method has good applicability in solving the other uncertain problems.
      原文链接:
    • NSTL
    • Elsevier

    Experimental and numerical study based on ductile failure for the tri-hub burst of turbocharger turbine

    Li B.Cui Y.Liu S.Liu Y....
    18页
    查看更多>>摘要：? 2022 Elsevier LtdThe prediction of the tri-hub burst of turbocharger turbine at a given speed range is a current problem of great practical interest. In this work, the theory of rotating discs burst is used to guide the design of pre-weakened turbine scheme, and a ductile failure approach, namely a coupled plasticity-damage model, is employed to predict the tri-hub burst of the pre-weaken turbine. The optimal defect sizes are obtained by burst simulation using the coupled plasticity-damage material model. Two pre-weakened turbine specimens is conducted in turbine containment test bench. Experimental results show that the tri-hub burst view between the simulation and experiment have a good agreement. For two pre-weakened turbine specimens, the burst speed error of simulation and experiment are 0.5% and 3.1%. Comparison with the prediction of the burst speed by the theory of linear elastic model and the theory of elastoplasticity, the burst speed predicted by the former is much less than the target burst speed (270,000 r/min), while the burst speed predicted by the latter is much larger than the target burst speed. In conclusion, the ductile failure approach is presented in the tri-hub burst prediction of the turbine to show that it is more accurate to predict the target burst speed. In addition, it also prove that the rotating discs burst theory can be used to guide the design of pre-weakened turbine scheme.
      原文链接:
    • NSTL
    • Elsevier

    Corrosion crack failure analysis of 316L hydraulic control pipeline in high temperature aerobic steam environment of heavy oil thermal recovery well

    Ma Z.Wang T.Li H.Liu W....
    14页
    查看更多>>摘要：? 2022The 316L hydraulic control pipeline (HCP) easily caused corrosion failure in the process of heavy oil recovery. In this study, the corrosion failure of 316L HCP in the 260–350 °C high temperature aerobic steam environment was investigated by using autoclave. Based on SEM, EDS, cracks morphology and XPS analysis, the failure mechanism of 316L HCP exposure in different high temperature steam environments was concluded. The results indicate that the corrosion fracture occurs at 260 °C. The SCC cracking was transgranular propagation, and the corrosion failure was attributed to anodic dissolution stress corrosion cracking. With the increase of temperature, the formation of absorbed water film on the surface contributes to improving the compactness of corrosion products which could prevent the crack propagating under corrosion medium. Moreover, the high temperature significantly affected the content of Cr(OH)3 and Ni(OH)2 in the oxide film which improved the corrosion resistance of stainless steel.
      原文链接:
    • NSTL
    • Elsevier

    Development method and experimental verification of fatigue load spectrum of anti-yaw damper for rail vehicles

    Liu C.Song Y.Li F.Wang S....
    19页
    查看更多>>摘要：? 2022 Elsevier LtdThe fatigue failure of anti-yaw damper seats on the carbody of railway vehicles is found during operation. The load time histories were obtained through calibration tests and field tests, and a novel load spectrum development method was proposed based on the field test results.The results show that the anti-yaw damper load presents the quasi-static characteristic within the frequency range of 5 Hz. The largest load impact on the anti-yaw damper seat appears when the vehicles pass through turnouts. Fatigue tests of the original and improved structures were carried out based on the proposed load spectrum. The fatigue failure phenomena of the damper seat were reproduced in the bench test. It is verified that the fatigue strength of the anti-yaw damper seat with improved structure meets the application requirements. This novel load spectrum development method could provide a reference for the design of other vehicle structures.
      原文链接:
    • NSTL
    • Elsevier

    Fault diagnosis and location identification of rotor–stator rub-impact based on Hjorth parameters

    Yu M.Chen W.Lu Y.
    15页
    查看更多>>摘要：? 2022 Elsevier LtdHjorth parameters reveals Activity, Mobility and Complexity of signals. From this, the paper has proposed the scheme to identify a rotor–stator rub-impact fault and occurrence location by Hjorth parameters. Firstly, the approach has given an analysis to the difference of Hjorth parameters of signals and verified the sensibility of Hjorth parameters to running state of equipment; secondly, in the same running state of equipment, the consistency and robustness of Hjorth parameters of signals from the same sensor have been analyzed and proved; thirdly, for verifying the sensitivity of sensors installation locations to rub-impact fault and occurrence locations, Hjorth parameters of signals from different sensors have been analyzed; finally, the calculated Hjorth parameters are used as feature vector, and K-nearest neighbor (KNN) classification algorithm is employed for identifying a rub-impact fault and determining the rub-impact locations. The results indicate that proposed method can accurately identify the rub-impact fault and occurrence locations.
      原文链接:
    • NSTL
    • Elsevier

    An adaptive deep learning model towards fault diagnosis of hydraulic piston pump using pressure signal

    Tang S.Zhu Y.Yuan S.
    16页
    查看更多>>摘要：? 2022 Elsevier LtdHydraulic pump is a critical component of a hydraulic transmission system. Its normal and stable operation will directly affect the reliability of the whole system. Owing to the complexity and concealment of fault information, it is crucial to explore an effective method for fault diagnosis of hydraulic piston pump. The obvious change of vibration signal can be observed when different fault types occur, and the implied characteristics of pressure signals are also varying. In this research, an adaptive convolutional neural network (CNN) is constructed based on the ontology representation of pump. First, time–frequency characteristics of pressure signals are obtained via continuous wavelet transform. Second, a deep CNN is established by setting initial hyperparameters. Third, Bayesian optimization is employed to achieve automatic learning of main important hyperparameters to construct an adaptive CNN. The proposed method has better performance for fault diagnosis of hydraulic piston pump compared with other modern intelligent methods.
      原文链接:
    • NSTL
    • Elsevier

    Statistics and construction methods for deep TBM tunnels with high geostress: A case study of Qinling Tunnel in Hanjiang-Weihe River Diversion Project

    Han X.Liang X.Ye F.Chen Z....
    16页
    查看更多>>摘要：? 2022 Elsevier LtdRockbursts pose serious threats to the engineering safety. As a typical deep TBM tunnel with high geostress, the Qinling Tunnel of Hanjiang-Weihe River Diversion Project has encountered a large number of rockbursts. Based on this project, a detailed analysis of the rockburst data was used to investigate the size and locations of single rockfalls, and volume of a single blast. Moreover, the relationships between rockbursts and lithology, and between rockbursts and buried depth were established, and the form of rockburst damage was analysed. In addition, specific construction methods under different rockburst levels were summarised, drawing on the successful experience of this project. A method for replacing the cutter head under rockburst risk after long-distance tunnelling was also proposed.
      原文链接:
    • NSTL
    • Elsevier

    Experimental study on flow-induced vibration response characteristics of leaching tubing in salt cavern gas storage

    Liu J.Zeng L.Guo X.Dai L....
    17页
    查看更多>>摘要：? 2022 Elsevier LtdTo address flow-induced vibration failure problems of water solution leaching tubing string in salt cavern gas storage, a laboratory experimental device for flow-induced vibration of leaching tubing string was developed based on the similarity principle, and the corresponding experimental bench was built, according to the on-site parameters of the M gas storage well in Jianghan Oilfield, China. The vibration simulation experiments were carried out, and the displacement and amplitude-frequency response data at the bottom end of the tubing string were measured. The influences of different operation parameters and structure modes, such as water injection flow rate, two-port distance, screen structure and circulation mode, on the vibration characteristics of the tubing string were explored, the failure mechanism of the leaching tubing string was revealed, and the corresponding vibration failure control methods were proposed. The results obtained demonstrate that, first, at the moment of pump start-up (corresponding to well opening on-site), the tubing string produced obvious water hammer phenomenon. With the increase of the water injection flow rate, the vibration displacement and frequency of the center tube first increase and then decrease, when the water injection flow rate is less than 1.55 L/min (corresponding to the on-site flow rate of 40 m3/h), the risk of vibration failure of leaching tubing can be reduced. Second, when the two-port distance is greater than 0.16 m (corresponding to the on-site two-port distance of 45 m), the amplitude and frequency of lateral vibration of the center tube increase significantly, and the risk of lateral vibration deformation of leaching tubing increases. Third, adding a symmetrical hole screen at the bottom of the center tube can significantly reduce the vibration displacement and frequency of leaching tubing, and improve the safety of the operation tubing string. Fourth, the vibration displacement and amplitude of the leaching tubing in the reverse circulation mode are smaller than those in the positive circulation mode. When the cavern shape requirements are met on-site, the vibration of the tubing string can be effectively reduced by using the reverse circulation cavern leaching.
      原文链接:
    • NSTL
    • Elsevier