| 疲劳极限以下小载荷的强化和损伤试验 |
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| 引用本文： | 卢曦,郑松林.疲劳极限以下小载荷的强化和损伤试验[J].上海理工大学学报,2009,31(2). |
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| 作者姓名： | 卢曦 郑松林 |
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| 作者单位： | 上海理工大学,机械工程学院,上海,200093 |
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| 基金项目： | 上海市教育委员会创新项目，上海市教育委员会资助项目 |
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| 摘 要： | 以某变速箱圆柱齿轮单齿弯曲为例,对疲劳极限以下小载荷的强化和损伤进行了试验研究.结果表明,疲劳极限以下的小载荷对疲劳寿命、疲劳强度和静强度均具有强化作用;一定范围内的小载荷作用一定的次数才能体现出强化效果;循环载荷谱中小载荷虽有一定的强化作用,但强化效果有所下降;循环载荷谱中小载荷循环次数增加,其强化效果随之增加;高载荷造成损伤后,原来具有强化作用的小载荷失去了强化效果,但更低的小载荷却体现出一定的强化效果;小载荷强化的原因是材料的微观组织得到强化和改善.
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| 关 键 词： | 小载荷 强化 损伤 程序载荷 |
Strengthening and damaging effect of low-amplitude load below fatigue limit |
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| LU Xi,ZHENG Song-lin.Strengthening and damaging effect of low-amplitude load below fatigue limit[J].Journal of University of Shanghai For Science and Technology,2009,31(2). |
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| Authors: | LU Xi ZHENG Song-lin |
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| Institution: | College of Mechanical Engineering;University of Shanghai for Science and Technology;Shanghai 200093;China |
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| Abstract: | The strengthening and damaging effect of low amplitude load below the fatigue limit were investigated,taaking as example the single tooth bending of transmission cylindrical gear under the programmed load composed of loads above and below the endurance limit.The experimental results show that the strengthening effect of low amplitude load in programmed load spectrum is somewhat weakened.The strengthening effect could be increased as the number of cycles of low amplitude load in programmed load spectrum incr... |
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| Keywords: | load below fatigue limit strengthening damaging programmed load |
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