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zoe122208: 金币+50, 翻译EPI+1, ★★★★★最佳答案 2015-07-01 21:04:35
在本研究中，内管材料 是应变率 不敏感材料，一旦 内管 发生 塑性变形，则 焊接失败。因此，在 推导 临界厚度的 过程中，我们 认为 内管 不允许出现 大变形，采用了 准静态模型 去描述 和计算 磁脉冲内管的 临界厚度 问题。另外，磁脉冲焊接 的动态作用 主要是体现在 外管上面，在 推导过程，计算 外管对内管的作用力P 是采用 速度和密度以及声速 几个参数 计算出来的，因此 认为 作用力P 是考虑了 动态效应之后 的。而且，针对 材料的 屈服强度，也是 考虑了 动态效应的。用了 一个 准静态模型 去描述和计算 动态问题 确实 不够严谨，在未来工作中，我们 会考虑 应力波 对内管、外管的 动态响应 问题。
In this research, the inner tube is made of materials that is insensitive to strain rate ( strain rate independent material), once plastic deformations emerge inside of the tube, it represents the welding failure. Therefore, in the process of deducing the critical thickness, in order to avoid the large deformations emerging inside of the tube, we adopted a quasistatic model to describe and calculate the critical thickness of the magnetic pulse inner tube. In addition, the dynamic effect of magnetic pulse welding was mainly reflected by external tube, in the deducing process, the force P that the external tube act on internal tube was calculated by adopting such parameters as speed, density and sound velocity. Therefore, the acting force P was believed to be convincing, not only for the consideration of dynamic effects by adopting various parameters, but also on for the consideration of dynamic effects according to the material yield strengths. Indeed, it is not fully rigorous to describe and calculate the dynamic issues by a quasistatic model, in our future work, efforts will be paid to the dynamic response of stress wave upon internal and external tubes. |
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