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首页> 外文会议>AMD-vol.257; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >FAILURE OF AN IMPULSIVELY-LOADED COMPOSITE STEEL/POLYMER PLATE
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FAILURE OF AN IMPULSIVELY-LOADED COMPOSITE STEEL/POLYMER PLATE

机译：脉冲加载的复合钢/聚合物板的失效

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摘要

The concept of spraying a thick layer of a polymeric material onto a metal plate has recently received considerable interest in many civilian and military applications. There are numerous analytical and numerical solutions for single thin (membrane) plates made of either a steel or an elastomer. However, solutions for a composite plate made of both of the above constituents are lacking. The objective of the present paper is to formulate a model for a composite steel/elastomer plate, derive an analytical solution for the plate subjected to impulsive loading and compare it with a more exact numerical solution. It is assumed that the circular plate is fully clamped around its periphery, and it is loaded by a uniformly distributed transverse pressure of high intensity and short duration. The pressure imparts an initial impulse which is proportional to the initial transverse velocity of the plate. As an example, DH-36 is used for a steel backing plate while polyurea is chosen as a coating. The analytical model is developed where the steel layer is treated as a rigid perfectly-plastic material. The magnitude of flow stress is adjusted iteratively according to the calculated magnitude of average strain. On the other hand, a linear elastic material is assumed for the polyurea with elastic modulus in the tensile range calculated from the Arruda-Boyce model. The magnitude of the average strain rate was relatively low, about 100 sec~(-1); therefore, the effect of strain rate is not considered in this paper. A comprehensive parametric study was performed by varying several material and structural parameters in the model. A closed-form analytical solution was compared with the results of detailed FE simulations of compos- ite plates, and good correlation is obtained. It was found that the polyurea coating could improve the failure resistance of the composite plate by 20 % provided that the thickness of the coating is 5 — 10 times larger than the plate.
机译：近来，在许多民用和军事应用中，将聚合材料的厚层喷涂到金属板上的概念引起了人们的极大兴趣。对于由钢或弹性体制成的单个薄（膜）板，有许多分析和数值解决方案。但是，缺乏由上述两种成分制成的复合板的解决方案。本文的目的是为钢/弹性体复合板建立模型，导出承受脉冲载荷的板的解析解，并将其与更精确的数值解进行比较。假定圆形板完全围绕其外围夹紧，并且由高强度且持续时间短的均匀分布的横向压力加载。该压力施加与板的初始横向速度成比例的初始脉冲。例如，DH-36用作钢背板，而聚脲则用作涂层。开发了分析模型，其中将钢层视为刚性的完美塑性材料。流动应力的大小根据计算得出的平均应变大小进行迭代调整。另一方面，假设聚脲具有线性弹性材料，其弹性模量在根据Arruda-Boyce模型计算的拉伸范围内。平均应变率的幅度相对较低，约为100 sec〜（-1）；因此，本文不考虑应变率的影响。通过改变模型中的几种材料和结构参数进行了全面的参数研究。将闭式分析解决方案与复合板详细有限元模拟的结果进行了比较，并获得了良好的相关性。已经发现，如果涂层的厚度是板的5-10倍，则聚脲涂层可以将复合板的耐故障性提高20％。

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