| 金属基复合材料热机械疲劳寿命影响参数研究 |
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| 引用本文： | 王放,陈志谦,吕世金.金属基复合材料热机械疲劳寿命影响参数研究[J].船舶力学,2010,14(7):765-770. |
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| 作者姓名： | 王放 陈志谦 吕世金 |
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| 作者单位： | 西南大学材料科学与工程学院,重庆,400715;中国船舶科学研究中心,江苏,无锡,214082 |
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| 基金项目： | 国家自然科学基金资助项目，重庆市科委自然科学基金计划资助项目 |
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| 摘 要： | 基于细观损伤机理,通过对金属基复合材料在热/机械循环载荷下疲劳破坏的数值模拟,研究了六种参数对疲劳寿命的影响.结果表明:(1)疲劳寿命随着试样尺寸的增大而缩短,但达到临界尺寸,即纤维规模超过25根或者长度超过30倍纤维直径后,疲劳寿命将不受尺寸变化的影响;(2)纤维体积含量影响了材料抗疲劳破坏的能力,疲劳寿命随着纤维体积百分含量的提高而延长;(3)疲劳寿命依赖于纤维强度Weibull分布中形状参数的变化,疲劳寿命随着形状参数的增大而延长;(4)疲劳寿命随着疲劳延性系数的增大而延长,但随着疲劳延性指数绝对值的增大而缩短.
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| 关 键 词： | 金属基复合材料 热/机械疲劳寿命 Monte-Cado模拟 参数研究 |
Effects of influential parameters on fatigue life of metal matrix composites under thermo-mechanical loading |
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| WANG Fang,CHEN Zhi-qian,L Shi-jin.Effects of influential parameters on fatigue life of metal matrix composites under thermo-mechanical loading[J].Journal of Ship Mechanics,2010,14(7):765-770. |
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| Authors: | WANG Fang CHEN Zhi-qian L Shi-jin |
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| Institution: | WANG Fang,CHEN Zhi-qian,L(U) Shi-jin |
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| Abstract: | The effects of six kinds of influential parameters on fatigue life of continuous fiber-reinforced metal matrix composites were investigated by numerical simulation based upon micromechanical damage mechanisms under cyclical thermomechanical loading.The results show that,(1) There is an obvious decrease in composite fatigue life as the specimen dimension increased.However the size effect on the fatigue life gets disappeared when the composite size is more than 25 fibers and its length is longer than 30 times... |
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| Keywords: | metal matrix composite thermo-mechanical fatigue life Monte-Carlo simulation parametric study |
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