| 卸载后加载对扭杆刚度下降门槛值的影响 |
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| 引用本文： | 卢红岩,孟宪红.卸载后加载对扭杆刚度下降门槛值的影响[J].力学与实践,2008,30(4):65-67. |
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| 作者姓名： | 卢红岩 孟宪红 |
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| 作者单位： | 北京航空航天大学 航空科学与工程学院 北京 100083 |
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| 摘 要： | 基于损伤力学原理，推导了扭力矩门槛值表达式. 并采用多次卸载后加载的方法
进行定扭角刚度下降实验，得到卸载后加载的剩余扭力矩，进而计算每次加载后的剪
应变门槛值. 实验表明多次卸载后加载的方法可在一定程度上提高剪应变门槛值.
此结论可以用于同类材料在工程应用中需要提高门槛值的构件.
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| 关 键 词： | 刚度下降实验 剪应变门槛值 损伤力学 |
| 收稿时间： | 2007-7-16 |
| 修稿时间： | 2007-10-22 |
THE EFFECT OF RELOADING ON THE THRESHOLD OF TWISTING BAR WITH STIFFNESS DEGRADATION |
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| LU Hongyan,MENG Xianhong.THE EFFECT OF RELOADING ON THE THRESHOLD OF TWISTING BAR WITH STIFFNESS DEGRADATION[J].Mechanics and Engineering,2008,30(4):65-67. |
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| Authors: | LU Hongyan MENG Xianhong |
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| Abstract: | In this paper, on the base of damage mechanics, the
expression of torque threshold is deduced. The method of reloading after
unloading is adopted to carry out the stiffness degradation experiment under
certain twisting angles, and the residual torque is obtained, and then the
threshold of the shear strain is calculated correspondent to every
reloading. According to the experiment, the threshold of the shear strain is
increased in certain degree under loading after unloading for many times.
This conclusion can be used to increase the threshold of structures made of
similar material which need higher threshold in engineering application. |
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| Keywords: | stiffness degradation experiment shear strain threshold damage mechanics |
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