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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Dynamic plastic response of double-layered circular metallic plates due to localized impulsive loading
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Dynamic plastic response of double-layered circular metallic plates due to localized impulsive loading

机译：局部圆形载荷对双层圆形金属板的动态塑性响应

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In this paper, the dynamic plastic response of double-layered circular metallic plates subjected to localized impulsive loading was investigated both numerically and empirically. A numerical model was developed in commercial finite element code ABAQUS/Explicit via a user user-defined FORTRAN subroutine in conjunction with the Johnson-Cook thermo-viscoplasticity and damage models. The numerical results were validated with the available experimental results. Next, rigorous parametric studies were conducted on double-layered plates made of Weldox 460E, Aluminum 1100-H12 and a combination of these materials with copper plates for the impulse range of 10-110 N.s. Finally, dimensional analysis of the parametric study was performed and new empirical design formulas were derived for prediction of central deflections of back and front layers based on the suggested dimensionless numbers. The numbers considered the effect of the structural geometry, the inertia of applied dynamic load, the material resistance ability to the plastic deformation, the strain rate sensitivity of the material, and the load ratio both for front and back layers. The comparison between parametric study results and proposed empirical expressions illustrated that the derived equations provided quite reliable and accurate predictions of the central deflections of back and front layers when the deflections changed ranging from 11.4 mm to 62.8 mm.
机译：本文通过数值和经验研究了双层圆形金属板在局部冲击载荷作用下的动态塑性响应。通过用户自定义的FORTRAN子例程，并结合Johnson-Cook热粘塑性和损伤模型，以商业有限元代码ABAQUS / Explicit开发了一个数值模型。数值结果得到了可用的实验结果的验证。接下来，在10-110 N.s的脉冲范围内，对由Weldox 460E，Aluminium 1100-H12制成的双层板以及这些材料与铜板的组合进行了严格的参数研究。最后，对参数研究进行了尺寸分析，并基于建议的无量纲数推导了新的经验设计公式，用于预测后层和前层的中心挠度。这些数字考虑了结构几何形状，施加的动态载荷的惯性，材料对塑性变形的抵抗能力，材料的应变率敏感性以及前层和后层的载荷比的影响。参数研究结果与建议的经验表达式之间的比较表明，当挠度在11.4 mm至62.8 mm范围内变化时，导出的方程式可以对背层和正面层的中心挠度提供非常可靠和准确的预测。

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