| 固支裂纹梁在剪切载荷下的动态特性 |
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| 引用本文： | 刘丰,马岩. 固支裂纹梁在剪切载荷下的动态特性[J]. 兰州理工大学学报, 2009, 35(6) |
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| 作者姓名： | 刘丰 马岩 |
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| 作者单位： | 兰州煤矿设计研究院,甘肃,兰州,730000 |
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| 摘 要： | 用半解析方法分析固支裂纹梁在剪切载荷下的动态特性.该方法将半解析函数作为插值函数,将缺口(裂纹)尖端附近的自由度通过位移场的扩展公式转化为一组广义坐标.通过相似单元转化方法获得双裂纹固支梁在集中载荷和分布载荷作用下的动态应力强度因子,得到结构的前5阶自然模态.结果表明,虽然为剪切模型,但在动态载荷作用下,KⅠ和KⅡ同时存在,说明了动态载荷的应力波作用.
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| 关 键 词： | 固支梁 动态应力强度因子 相似单元方法 半解析法 动态特性 |
Dynamic characteristics of fixedly supported beam with cracks under shearing load |
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| LIU Feng,MA Yan. Dynamic characteristics of fixedly supported beam with cracks under shearing load[J]. Journal of Lanzhou University of Technology, 2009, 35(6) |
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| Authors: | LIU Feng MA Yan |
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| Affiliation: | LIU Feng,MA Yan(Lanzhou Colliery Designing Institute,Lanzhou 730000,China) |
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| Abstract: | Dynamic characteristics of fixedly supported beam with cracks subject to shearing load were analyzed with semi-analytic method.The semi-analytic formula was taken as an interpolation function near crack tip notch and the degree of freedom near the notch tip were transformed into a set of generalized coordinates by means of series expansion formulas of displacement field.The dynamic stress intensity factor for fixedly supported beam with two cracks under concentrated load and distributed loading by using the... |
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| Keywords: | fixedly supported beam dynamic stress intensity factor similar element method semi-analytical method dynamic characteristics |
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