Nonlinear transient analysis of FGM and FML plates under blast loads by experimental and mixed FE methods
Nonlinear transient analysis of FGM and FML plates under blast loads by experimental and mixed FE methods
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DOI：
10.1016/j.compstruct.2011.09.008
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发表时间：
2012-01-01
影响因子：
6.3
通讯作者：
Omurtag, Mehmet H.
中科院分区：
文献类型：
--
作者：
Aksoylar, Cenk;Omercikoglu, Akin;Omurtag, Mehmet H.
通过实验和数值技术研究了非理想爆炸载荷下纤维金属层压（FML）复合材料板的非线性瞬态行为。在实验中，三个不同纵横比的板在爆炸载荷下进行了测试，并对它们的响应进行了模拟，并与开发的混合有限元方法和商业软件 ANSYS 进行了比较。此外，还使用混合有限元法对爆炸载荷下功能梯度 (FGM) 薄板的非线性瞬态行为进行了参数数值分析。在这些参数分析中，研究了纵横比、载荷分布和时域脉冲函数的影响。在开发的混合有限元公式中，使用了冯卡门板理论。非线性泛函是使用 Hellinger-Reissner 原理开发的，并通过增量公式进行线性化。使用 Newmark 方法和 Newton-Raphson 迭代进行动态分析。不进行凝聚，因此在求解过程中也会计算内力的时间导数。阻尼以瑞利阻尼的方式纳入分析中。进行分析的结果是，数值结果与实验结果之间具有良好且可靠的一致性。此外，开发的混合有限元结果与 ANSYS 结果几乎相同。 (C) 2011 Elsevier Ltd. 保留所有权利。
Nonlinear transient behavior of fiber-metal laminated (FML) composite plates under non-ideal blast loads are investigated by both experimental and numerical techniques. In the experiments three plates with different aspect ratios are tested under blast loads and their response is also simulated and compared with both the developed mixed finite element method and the commercial software ANSYS. Furthermore parametric numerical analyses are conducted for nonlinear transient behavior of functionally graded (FGM) thin plates under blast loads with mixed FEM. In these parametric analyses the effect of aspect ratio, load distribution and impulse function in time domain are investigated. In the developed mixed FE formulation, the von Karman plate theory is used. Nonlinear functional is developed using the Hellinger-Reissner principle and linearized with the incremental formulation. Dynamic analyses are carried using the Newmark method with the Newton-Raphson iterations. Condensation is not performed hence time derivative of internal forces are also calculated during the solutions. Damping is incorporated to the analysis in the sense of the Rayleigh damping. As a result of conducted analyses, there is a good and reliable agreement between the numerical and the experimental results. Moreover, the developed mixed FEM results are almost identical to the ANSYS results. (C) 2011 Elsevier Ltd. All rights reserved.