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《Acta Mechanica Solida Sinica》 2005-01
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INVESTIGATION TO THE TENSILE FAILURE OF LY12 SUBJECTED TO THERMOMECHANICAL LOADING WITH HIGH HEATING-RATE

Peng Xianghe 1 Yang Yunmin 1 Chen Yuze 2 Yin Yihui 2 ( 1Department of Engineering Mechanics, Chongqing University, Chongqing, 400044) ( 2Institute of Mechanics, Chinese Academy of Engineering Physics, Mianyang, 621900)  
Using a Gleeeble 1500 thermal mechanical material testing system, experiments are performed to investigate the effect of heating rate and its history on the tensile strength of LY12 aluminum alloy at different working temperatures, and to determine the failure temperature of the material for the given preloaded stresses. Metallographical analysis of the fracture region shows that besides temperature and preloaded stress level, heating rate plays a significant role. The local thermal inconsistency is introduced and verified with a numerical example. It shows that high heating rate may induce very strong local residual stress that may cause severe damage in the material. Since most engineering materials are, in nature, heterogeneous, the study on the effect of high heating rate on the materials properties will be of great significance.
【Fund】: 国家自然科学基金 (10 2 72 119);; 教育部“跨世纪优秀人才培养计划”基金资助 .
【CateGory Index】: TG115
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