| 电磁热效应裂纹止裂研究的进展 |
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| 引用本文： | 白象忠,胡宇达,等.电磁热效应裂纹止裂研究的进展[J].力学进展,2000,30(4):546-557. |
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| 作者姓名： | 白象忠 胡宇达 |
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| 作者单位： | 秦皇岛燕山大学机械工程学院 |
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| 基金项目： | 国家自然科学基金(19772046)及河北省自然科学基金(599255)资助项目 |
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| 摘 要： | 利用电磁场的热效应对带有裂纹的载流导体进行裂纹止裂，是达到延长其工作寿命、提高安全性和可靠性的一种行之有效的方法．理论计算和试验观察都证明了：载流导体中裂纹尖端处的热集中效应，能够在附近的一个很小范围内熔化形成微小的焊口，裂纹前缘处的曲率半径瞬间增加了２～３个数量级，显著地减少了应力集中，阻止了干线裂纹源的形成，有效地遏制了裂纹的扩展。本文阐述了这一物理过程的研究现状、进展情况以及未来应用前景．
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| 关 键 词： | 载流导体 电磁热效应 裂纹 裂纹尖端 |
| 修稿时间： | 1999年5月24日 |
ADVANCE OF THE STUDY OF
CRACK PREVENTION BY THE ELECTROMAGNETIC HEAT EFFECT |
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| Abstract.ADVANCE OF THE STUDY OF
CRACK PREVENTION BY THE ELECTROMAGNETIC HEAT EFFECT[J].Advances in Mechanics,2000,30(4):546-557. |
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| Authors: | Abstract |
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| Abstract: | The crack prevention for a conductor with a crack by the heat effect of the electromagnetic field is effective, in extending its service life and improving its security and reliability. The theoretical calculations and experimental studies show that a small welded joint can be formed at a small sphere near the tip of a crack inside, the conductor by smelting as the result of heat concentration effect. The curvature of the crack front will be increased in several orders of magnitude instantly and the stress concentration will be reduced remarkably. So the formation of the main crack will be prevented and the extension of the crack will be prevented too. The current status of studies about this physical phenomenon, their further development and the prospect of its application in the future are reviewed in this paper. |
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| Keywords: | thin current-carrying conductor electro-magnetic heat effect crack crack tip crack preventing |
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