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fatigue life.Evaluation Method for Foundry Crane Metal Structure Considering Load Dynamic Response and Crack Closure Effect

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 525-553页

作者： Qing Dong Bin He Gening Xu School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuanChina.

To compensate for the shortcomings of quasi-static law in anti-fatigue analysis of foundry crane metal structures,the fatigue life.evaluation method of foundry crane metal structure considering load dynamic response and crack closure effect is *** line with the theory of mechanical vibration,a dynamic model of crane structure during the working cycle is constructed,and dynamic coefficients under diverse actions are *** models of the internal force dynamic change process of dangerous cross-sections and a simulation model of first principal stress-time history are established by using the steel structure design criteria,which is utilised to extract the change of first principal stress of danger points over ***,the double-parameter stress spectrum is obtained by the rain flow counting *** fatigue life.calculation formula is corrected by introducing a crack closure parameter that can be calculated by the stress ratio and the effective stress *** the finite element model imported into ***,crack propagation analysis is performed by the growth method in the fatigue integration module *** the metal structure of a 100/40t-28.5m foundry crane with track offset as an example,the accuracy of calculation results and the feasibility and applicability of the proposed method are verified by theoretical calculation and finite element simulation,which provide a theoretical basis for improvement of the fatigue resistance design of foundry cranes.

关键词： Metal structure of foundry crane load dynamic effect crack closure effect crack propagation fatigue life.

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fatigue Properties of Plain Concrete under Triaxial Constant-Amplitude Tension-Compression Cyclic Loading

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Journal of Shanghai University(English Edition) 2005年第2期9卷 127-133页

作者：宋玉普曹伟孟宪宏 State Key Laboratory of Coastal and Offshore Engineering Dalian University o f Technology Dalian 116023 P.R. China Dongguan Civil Engineering Quality Supervision Office Dongguan 523067 P.R. C hina State

fatigue tests were conducted on tapered plain concrete prism specimens under tri axial constant-amplitude tension-compression cyclic loading. The low stress of the cyclic loading was taken as 0.2f c and the upper stress ranged from 0. 20f t to 0.65f t. Three constant lateral pressures were 0.1f c, 0.2f c and 0.3f c respec tively. Based on the results, the th ree-stage evolution rule of the fatigue stiffness, maximum(minimum) longitudina l strain and damage were analyzed, and a unified S-N curve to calculate fati gue strength factors was worked out. The results show that the fatigue strength and fa tigue life.under triaxial constant-amplitude tension-compression cyclic loadin g are smaller than those under uniaxial fatigue condition. Moreover, the secondary strain creep rate is related to the fatigue life. a formula for describing thei r relation was derived. The investigation of this paper can provide information for the fatigue design of concrete structures.

关键词： concrete triaxial constant-amplitude tension-compression cyclic loading fati gue strength fatigue life.

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EFFECTS OF ELECTRON BEAM LOCAL HEAT TREATMENT ON fatigue PROPERTIES FOR Ti-6Al-4V ALLOY JOINTS

EFFECTS OF ELECTRON BEAM LOCAL HEAT TREATMENT ON FATIGUE PRO...

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： FU Pengfei, LIU Fangjun, MAO Zhiyong, LI Jinwei Beijing Aeronautical Manufacturing Technology Research Institute, 100024,CHINA, Baliqiaobei , Chaoyang District, Beijing, P.O.Box 863

Ti-6Al-4V alloy plates after electron beam welding(EBW) were heat treated by electron beam local heat treatment(EBLHT),the joints specimens were tested by low cycle fatigue tests,and the influence of

关键词： Electron beam heat treatment Ti-6Al-4V alloy fatigue life.

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结构风振的概率疲劳累积损伤

结构风振的概率疲劳累积损伤

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中国土木工程学会桥梁及结构工程学会结构可靠度委员会全国第三届学术交流会议

作者：欧进萍叶骏哈尔滨建筑工程学院

本文通过考虑脉动风压的随机过程性,利用风荷载的规范标定方法和结构疲劳试验结果,从结构风振随机反应分析着手,提出了基于疲劳累积损伤机制的抗风结构疲劳可靠性和寿命估计的分析方法,并通过一典型单自由度结构说明了此方法的应用．

关键词： Wind-resistance structure fatigue cumulative damage reliability analysis fatigue life.

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