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temperature evolution and fatigue life evaluation of AZ31B magnesium alloy based on infrared thermography

Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1942-1948页

作者：闫志峰张红霞王文先王凯裴飞飞太原理工大学材料科学与工程学院太原030024

The surface temperature of extruded AZ31B alloy plate was measured by infrared thermograph in air during tension and high-cycle fatigue tests. The mechanism of heat production was discussed and the value of critical fatigue damage temperature was calculated according to the P—ΔT curve. Results show that the variation trend of temperature is different between tension and fatigue tests. The temperature evolution in tension test consists of four stages： linear decrease, reverse linear increase, abrupt increase, and final drop. The initial decrease of temperature is caused by thermal elastic effect, which is corresponding to the elastic deformation in tension progress. When cyclic loading is above the fatigue limit, the temperature evolution mainly undergoes five stages： initial increase, steep reduction, steady state, abrupt increase, and final drop. The peak temperature in fatigue test is caused by strain hardening that can be used to evaluate the fatigue life of magnesium alloy. The critical temperature variation that causes the fatigue failure is 3.63 K. When ΔT≤3.63 K, the material is safe under cyclic loading. When ΔT3.63 K, the fatigue life is determined by cycle index and peak temperature.

关键词： AZ31B magnesium alloy high-cycle fatigue thermographic analysis temperature evolution

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Review on the Fatigue temperature evolution of Structural Metal

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International Journal of Plant Engineering and Management 2014年第2期19卷 88-95页

作者： FENG Shuo WANG Zhong-qi XUE Hong-qian QIAO Song-song CUI Zi-wei School of Mechanical Engineering Northwestern Polytechnical University China aviation engine establishment Space Star Technology Co. Ltd.

With the rapid development of infrared imaging technology in last decades, the application range of the nondestructive examination, including fatigue testing,is continuously wider. By reviewing the studies and utilizations of temperature evolution during metal undergoing cyclic loading, this paper provides a reference and also guidance for further research. According to the articles on fatigue temperature evolution, the present overview summarized general rule and characteristics of fatigue temperature evolution. The cause of this temperature evolution is specifically analyzed. Some fatigue life prediction methodologies based on the temperature evolution are systematically reviewed. Finally, a prospect of this research direction is given.

关键词： temperature evolution infrared imaging fatigue testing nondestructive examination

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Dynamic thermo-mechanical behaviors of SME TiNi alloys subjected to shock loading

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Acta Mechanica Sinica 2020年第6期36卷 1336-1349,I0004页

作者： Lingyan Shen Yonggui Liu Mengmeng Hui School of Civil Engineering Henan Polytechnic UniversityJiaozuo454000China CAS Key Laboratory for Mechanical Behavior and Design of Materials University of Science and Technology of ChinaHefei230027China

Dynamic thermo-mechanical coupling behaviors of shape memory TiNi alloy in the strain rate ranging from 300 s^−1 to 2000 s^−1 are investigated by the split Hopkinson pressure bar(SHPB)device with an infrared(IR)detection *** stress–strain space,dynamic response shows a strong strain hardening property,however,in stress–temperature space,transformation path is particularly sensitive to the strain *** corresponding temperature evolution measured synchronously shows that local temperature increased associated with the forward phase transition,and it would keep the loading maximum value unchanged or decreased for unloading,depending on the strain ***,local temperature evolution was consistent with the transformation stress and its values at different points are the *** evolution and transformation deformation mechanism is then analyzed by a simple one-dimensional *** results show that latent heat and dissipated energy are responsible for temperature ***,the temperature evolution with strain rate reveals that with the increase of strain rate,the phase transformation deformation mechanism undergoes a transformation from phase transition fronts propagation during lower strain rates to combination of local nucleation and front propagation during middle strain rate and to uniform nucleations during higher strain *** results are helpful for a passive shape memory alloy(SMA)micro-valve design.

关键词： Thermal-mechanical coupling temperature evolution Strain rate effect Phase transformation path

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Fatigue limit assessment of a 6061 aluminum alloy based on infrared thermography and steady ratcheting effect

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1301-1308页

作者： Ru-yi Feng Wen-xian Wang Zhi-feng Yan Deng-hui Wang Shi-peng Wan Ning Shi College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan University of TechnologyTaiyuan 030024China

To quickly predict the fatigue limit of 6061 aluminum alloy,two assessment methods based on the temperature evolution and the steady ratcheting strain difference under cyclic loading,respectively,were *** temperature evolutions during static and cyclic loadings were both measured by infrared *** tests show that the temperature evolution was closely related to the cyclic loading,and the cyclic loading range can be divided into three sections according to the regular of temperature evolution in different *** mechanism of temperature evolution under different cyclic loadings was also analyzed due to the thermoelastic,viscous,and thermoplastic ***,ratcheting strain under cyclic loading was also measured,and the results show that the evolution of the ratcheting strain under cyclic loading above the fatigue limit undergone three stages:the first increasing stage,the second steady state,and the final abrupt increase *** fatigue limit of the 6061 aluminum alloy was quickly estimated based on transition point of linear fitting of temperature increase and the steady value of ratcheting strain ***,it is feasible and quick of the two methods by the proof of the traditional S-N curve.

关键词： 6061 Aluminum temperature evolution fatigue limit ratcheting strain

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