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【答案】应助回帖
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ... zoe122208: 金币+95, 翻译EPI+1, ★★★★★最佳答案 2015-07-01 21:08:42
根据文献 可知,在超高 冲击载荷下,材料的 动态屈服强度 和 准静态下的 屈服强度 之比 可能在1~100之间,钢在 受到 几百米速度 冲击时 动态屈服强度 相比准静态屈服强度 可以 增加4倍左右。基于此,我们 首先 通过试验 来获得 某一条件下的 临界厚度,之后 将临界厚度 和冲击压力 带入到 公式中 先计算出 钢在这一条件下的 动态屈服强度,约为1GPa左右(为准静态条件下 的3倍),再将该 屈服强度 作为 计算 其他临界厚度时 20#钢 在其他冲击条件下 的依据,最终得出 不同放电电压(不同冲击速度)下的 临界厚度。
According to relevant literatures, we can learn that under ultrahigh impulse load, the ratio between material dynamic yield strength and quasi-static yield strength can be 1~100. Under the shock of several hundred meters speed, the material yield strength can increase by approximately 4 times. On this basis, firstly we made an experiment and obtained a material critical thickness under certain condition; then we put this critical thickness and the shock pressure into equation to calculate the dynamic yield strength under such condition, and the result was about 1GPa ( 3 times bigger than the that under quasi-static condition), based on which, we calculated other critical thicknesses of the 20# steel under various discharge voltages (various impact velocities ). |
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