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Method for Evaluating Bolt Competitive Failure Life Under Composite Excitation 被引量:1
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作者 Guangwu Yang Long Yang +3 位作者 Han Zhao Haoxu Ding Bing Yang Shoune Xiao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第4期372-384,共13页
In this study,the competitive failure mechanism of bolt loosening and fatigue is elucidated via competitive failure tests on bolts under composite excitation.Based on the competitive failure mechanism,the mode predict... In this study,the competitive failure mechanism of bolt loosening and fatigue is elucidated via competitive failure tests on bolts under composite excitation.Based on the competitive failure mechanism,the mode prediction model and“load ratio-life prediction curve”(ξ-N curve)of the bolt competitive failure are established.Given the poor correlation of theξ-N curve,an evaluation model of the bolt competitive failure life is proposed based on Miner’s linear damage accumulation theory.Based on the force analysis of the thread surface and simulation of the bolt connection under composite excitation,a theoretical equation of the bolt competitive failure life is established to validate the model for evaluating the bolt competitive failure life.The results reveal that the proposed model can accurately predict the competitive failure life of bolts under composite excitation,and thereby,it can provide guidance to engineering applications. 展开更多
关键词 BOLT Competitive failure life Evaluation model Mode prediction model Composite excitation
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On Willa Cather's Sense of Values and Philosophy of Life——After Reading The Sculptors' Funeral
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作者 Li Xiaoling (Lanzhou Normal College, Lanzhou, 730070, China) 《兰州大学学报(社会科学版)》 CSSCI 北大核心 2000年第S1期29-32,共4页
What is success? How is success measured? Willa Cather provides us two sets of values.To some people, success is measured in terms of money. To some success means choosing one’s own life and realizing one’s own valu... What is success? How is success measured? Willa Cather provides us two sets of values.To some people, success is measured in terms of money. To some success means choosing one’s own life and realizing one’s own values. In the novel The Sculptor’s Funeral Cather portrays an artist, who breaks the bondage of the old environment, and becomes a successful sculptor. However, he is regarded as a failure by his local people because the values by which they judge success are not the same. 展开更多
关键词 Sense of values philosophy of life tragedy success failure
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CYCLIC HYSTERESIS ENERGY OF CARBON AND ALLOY STEELS 被引量:2
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作者 TONG Xiaoyan WANG Dejun XU Hao Northeast University of Technology,Shenyang,China TONG Xiaoyan P.O.Box 180,Northeast University of Technology,Shenyang 110006,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1990年第2期123-127,共5页
Based on the low-cycle fatigue tests of carbon and alloy steels,the cyclic properties of hysteresis energy and its changing rules have been analysed.The mathematical formula of cyclic hysteresis energy of the material... Based on the low-cycle fatigue tests of carbon and alloy steels,the cyclic properties of hysteresis energy and its changing rules have been analysed.The mathematical formula of cyclic hysteresis energy of the materials with different cyclic properties have been presented. The total absorbed energy to failure is associated with the variation of cyclic hysteresis energy. 展开更多
关键词 cyclic hysteresis loop cyclic hysteresis energy fatigue failure life Masing material Non-Masing material
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Storage life of silicone rubber sealing ring used in solid rocket motor 被引量:4
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作者 Liu Weikai He Guoqiang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第6期1469-1476,共8页
It is urgent to carry out detailed research on storage performance of rubber sealing ring to get the criterion for its storage life. This paper acquires material ageing regularity by theoretical analysis and experimen... It is urgent to carry out detailed research on storage performance of rubber sealing ring to get the criterion for its storage life. This paper acquires material ageing regularity by theoretical analysis and experimental confirmation. On this condition, failure mode and failure criterion of typical sealing structure is studied, and the failure mechanism is found. Thus by analyzing the stress distribution, the relationship between ageing state and sealing condition is established. Rationalization proposal is put forward and storage life of sealing ring is evaluated. The research mentionedabove has special reference to the design of sealing structures and can provide reference for prolonging their service life. 展开更多
关键词 failure criterion Sealing ring Silicone rubber Solid rocket motor Storage life
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Machinability of damage-tolerant titanium alloy in orthogonal turn-milling 被引量:2
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作者 Tao SUN Lufang QIN +1 位作者 Junming HOU Yucan FU 《Frontiers of Mechanical Engineering》 SCIE CSCD 2020年第3期504-515,共12页
The damage-tolerant titanium alloy TC21 is used extensively in important parts of advanced aircraft because of its high strength and durability. However, cutting TC21 entails problems, such as high cutting temperature... The damage-tolerant titanium alloy TC21 is used extensively in important parts of advanced aircraft because of its high strength and durability. However, cutting TC21 entails problems, such as high cutting temperature, high tool tip stress, rapid tool wear, and difficulty guaranteeing processing quality. Orthogonal turn-milling can be used to solve these problems. In this study, the machinability of TC21 in orthogonal turn-milling is investigated experimentally to optimize the cutting parameters of orthogonal turn-milling and improve the machining efficiency, tool life, and machining quality of TC21. The mechanism of the effect of turn-milling parameters on tool life is discussed, the relationship between each parameter and tool life is analyzed, and the failure process of a TiAlN-coated tool in turn-milling is explored. Experiments are conducted on the integrity of the machined surface (surface roughness, metallographic structure, and work hardening) by turn-milling, and how the parameters influence such integrity is analyzed. Then, reasonable cutting parameters for TC21 in orthogonal turn-milling are recommended. This study provides strong guidance for exploring the machinability of difficult-to-cut-materials in orthogonal turn-milling and improves the applicability of orthogonal turn-milling for such materials. 展开更多
关键词 orthogonal turn-milling damage-tolerant titanium alloy tool life and failure machined surface integrity MACHINABILITY
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Microstructure characterization and HCF fracture mode transition for modified 9Cr-1Mo dissimilarly welded joint at different elevated temperatures 被引量:1
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作者 Chendong Shao Fenggui Lu +2 位作者 Xiongfei Wang Yuming Ding Zhuguo Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第12期1610-1620,共11页
The high cycle fatigue(HCF) tests of modified 9 Cr-1 Mo dissimilarly welded joint were carried out at different elevated temperatures and the fracture mechanism was systematically revealed. The fatigue strength at 1... The high cycle fatigue(HCF) tests of modified 9 Cr-1 Mo dissimilarly welded joint were carried out at different elevated temperatures and the fracture mechanism was systematically revealed. The fatigue strength at 108 cycles based on S-N curve can be estimated as a half of weld joint's yield strength for all conducted temperatures, which can be a reliable criterion in predicting the fatigue life. The results show that the inter-critical heat affected zones(IC-HAZs) of both sides are the weak zones due to their low hardness and inferior fatigue resistance property. HAZ of COST-FB2(BM2) is the weakest zone at room temperature due to the existence of numerously distributed defects and the initiation of cracks, either in the surface or interior zone, impacting a crucial effect on the fatigue life of the joint. While at elevated temperatures, fatigue life was controlled mostly by the intrusion-extrusion mechanism at the specimen surface under high stress level and subsurface non-defect fatigue crack origin(SNDFCO) from the interior material under low stress amplitude. With increasing temperature, more and more fatigue failures began to occur at the HAZ of COST-E(BM1) due to its higher susceptibility of temperature. Besides, it is found that the-ferrite in the BM1 has no harm to the HCF behavior of the joint at the conducted temperatures. 展开更多
关键词 High cycle fatigue Dissimilarly welded joint life time Fatigue failure Fracture mode
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