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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->西北工业大学]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research progress in damage mechanism of nickel-based single crystal superalloys under service conditions]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to improve the service life of nickel-based single crystal blades and solve the key technology of aeroengine turbine and gas turbine, domestic and overseas researchers carried out a large number of research on the failure and damage mechanism of nickel-based single crystal superalloys under service conditions in recent years. The research achievements and progress of fatigue, creep and thermomechanical fatigue damage mechanism of nickel-based single crystal superalloys under service conditions were concluded. In addition, in view of the time and cost increase caused by a large number of experiments, the research works and achievements in life prediction methods of nickel-based single crystal superalloys in recent years were summarized, and the difficulties and challenges in life evaluation and failure analysis of nickel-based single crystal superalloys were proposed.]]></description>
<pubDate>2023/7/20 0:00:00</pubDate>
<category><![CDATA[西北工业大学]]></category>
<author><![CDATA[SHEN Jianghua, ZHOU Yuting, WANG Xiuxia]]></author>
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<atom:name>SHEN Jianghua, ZHOU Yuting, WANG Xiuxia</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research progress of operational reliability of civil aircraft]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the technical status and development trend of civil aircraft operation reliability research, the requirements of civil aircraft operation reliability research were expounded according to the current type design, development and actual situation of in-service aircraft. By reviewing the research progress and engineering application status of civil aircraft operational reliability theory, the research status and problems of civil aircraft operational reliability are elaborated from six aspects:operation data acquisition and processing, operational reliability analysis method, operational reliability prediction feedback technology, optimization design based on operational reliability, optimize maintenance tasks, and comprehensive management platform for operational reliability. The future development direction of operation reliability research of civil aircraft is prospected.]]></description>
<pubDate>2023/7/20 0:00:00</pubDate>
<category><![CDATA[西北工业大学]]></category>
<author><![CDATA[FENG Yunwen, LIU Jiaqi, PAN Weihuang, LU Cheng]]></author>
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<atom:name>FENG Yunwen, LIU Jiaqi, PAN Weihuang, LU Cheng</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-scale implicit scheme for steady flows of diatomic molecular gases in all flow regimes]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The application of unified gas kinetic scheme is greatly hindered by the huge requirements of computing resources. Based on Boltzmann-Rykov model equation, a conservative implicit scheme for steady flows in all flow regimes was developed by adopting macroscopic prediction technique, and the macroscopic equation and microscopic equation were solved collaboratively to accelerate the convergence. At the cell interface, a simplified and efficient multi-scale numerical flux was directly constructed from the characteristic difference solution of kinetic model equation. The adoption of non-uniform, unstructured velocity space and velocity space adaptive technology further reduce the requirement of computation and improve computational efficiency. The applications of unstructured discrete velocity space and adaptive discrete velocity space reduced the number of velocity mesh significantly and made the present method be rather efficient. The accuracy and effectiveness of the proposed method were confirmed by the simulations of rarefied supersonic and hypersonic flows over a flat plate, supersonic and hypersonic flows over a sphere. Numerical results indicate that the proposed method can accurately solve two-dimensional and three-dimensional diatomic gas multi-scale flow problems, and it is about one orders of magnitude faster than the explicit discrete unified gas kinetic scheme method.]]></description>
<pubDate>2023/7/20 0:00:00</pubDate>
<category><![CDATA[西北工业大学]]></category>
<author><![CDATA[ZHONG Chengwen, CHEN Jianfeng, ZHANG Rui, ZHUO Congshan, LIU Sha]]></author>
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<atom:name>ZHONG Chengwen, CHEN Jianfeng, ZHANG Rui, ZHUO Congshan, LIU Sha</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Dynamic loading technology for Mullins effect of rubber elastomer used in aeronautical tires]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The rubber elastomers, widely used in aeronautical tires, are subject to experience severe dynamic cycling loading during their engineering service. In order to obtain their mechanical characteristics and potential damage mechanisms under those conditions, a dynamic loading methodology was proposed for performing Mullins effect experiments based on stress wave loading. According to the characteristics of stress wave propagation, the dimension parameters of each unit were designed and configured on the basis of Hopkinson pressure bar principle. An experimental system was then built for rubber elastomer materials, and the dynamic cyclic behavior of styrene-butadiene rubber used in tires was obtained. The analyses on the experimental original signals demonstrated that the system can obtain the increasing maximum strain during each cycle, which manifested the system can achieve the dynamic loading of Mullins effect for elastomer. Finally, the loading system specificaitons were discussed for obtaining controllable loading and unloading parameters after finely adjusting system components.]]></description>
<pubDate>2023/7/20 16:28:59</pubDate>
<category><![CDATA[西北工业大学]]></category>
<author><![CDATA[MIAO Yinggang, YIN Jianping, DU Wenxuan]]></author>
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<atom:name>MIAO Yinggang, YIN Jianping, DU Wenxuan</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Simulation of the oblique entry motion of convolutional projectile into water]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the influence of motion parameters and warhead shape on the oblique entry process of a projectile into water, adopting volume of fraction of gas-liquid two-phase flow and water vapor cavitation model. The three-dimensional kinematics and dynamics of the rigid body were coupled by nested grids, and the motion process of the projectile in the stage of speed 80~100 m/s tilting into water and opening cavitation process was simulated. According to the literature experiments, the prediction errors of the velocity and displacement of the underwater projectile are 0~6% and -8%~0, and the rotation angle error is - 6%~0. Through the simulation study of the water entry velocity and angle of entering water under multiple working conditions, it is found that with the increase of the water entry velocity, the axial impact load of the projectile increases. The maximum load is linearly related to the square of the speed, and the nonlinear attenuation rate of the velocity is large. The larger the angle of entry, the smaller the angular rate of rotation of the projectile body, the stronger the stability of movement. But the velocity decay rate is not affected by the angle of entry.The projectile body adopted a stepped head modification, compared with the conical nose projectile, the average velocity decay rate, rotation angular rate and maximum axial impact load of the body after the head stepped modification are reduced to 66.7%, 40% and 77.2% respectively. The motion stabilitity is improved significantly.]]></description>
<pubDate>2023/7/20 16:28:59</pubDate>
<category><![CDATA[西北工业大学]]></category>
<author><![CDATA[ZHAO Xu, HU Xinkang, YAO Rui]]></author>
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<atom:name>ZHAO Xu, HU Xinkang, YAO Rui</atom:name>
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