Ridge-cut explosive bolts are a type of pyrotechnic release devices in which two connected structures are separated by explosives. They are designed such that shock waves can interact with and cut their body. Furthermore, they provide a clean separation surface and require a smaller explosive amount compared with other types of explosive bolts. In this study, ridge-cut explosive bolts of various diameters and with an exploding bridge wire (EBW) detonator were developed for use in sled testing. Their initial shapes were designed using an established procedure. Initial separation tests for the initial designs of the explosive bolts showed that considerable debris was produced for some models and that the explosive amount should be reduced. For the minimization of the number of experiments, the appropriate explosive amount was determined in advance through numerical analysis, which was performed using Autodyn, a commercial hydrocode. The numerical analysis technique used was improved to analyze the complete separation phenomena. The numerical results clearly revealed the separation mechanism and characteristics of the explosive bolts and helped determine an appropriate explosive amount for achieving a small amount of debris. Verification tests confirmed that explosive amounts determined using the numerical results were appropriate for separation and generated a small amount of debris.

中文翻译：

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脊形爆破螺栓分离机理及特性的数值分析研究

切脊爆炸螺栓是一种烟火释放装置，其中两个连接结构被炸药隔开。它们的设计使得冲击波可以与它们的身体相互作用并切割它们。此外，与其他类型的爆炸螺栓相比，它们提供了一个干净的分离表面并且需要更小的爆炸量。在这项研究中，开发了各种直径和爆炸桥线 (EBW) 雷管的脊形切割爆炸螺栓，用于雪橇测试。它们的初始形状是使用既定程序设计的。爆炸螺栓初始设计的初步分离测试表明，某些型号产生了大量碎片，应减少爆炸量。为了尽量减少实验次数，适当的爆炸量是通过数值分析预先确定的，这是使用商业水代码 Autodyn 进行的。改进了所使用的数值分析技术来分析完全分离现象。数值结果清楚地揭示了爆炸螺栓的分离机制和特性，有助于确定适当的爆炸量以实现少量碎片。验证测试证实，使用数值结果确定的爆炸量适合分离并产生少量碎片。数值结果清楚地揭示了爆炸螺栓的分离机制和特性，有助于确定适当的爆炸量以实现少量碎片。验证测试证实，使用数值结果确定的爆炸量适合分离并产生少量碎片。数值结果清楚地揭示了爆炸螺栓的分离机制和特性，有助于确定适当的爆炸量以实现少量碎片。验证测试证实，使用数值结果确定的爆炸量适合分离并产生少量碎片。