关于海船船体总强度准则的一个新见解

  目的  为提高船体加筋板极限承载性能非线性数值模拟的准确性，研究理想弹塑性、各向同性强化及循环塑性Chaboche材料模型对加筋板极限状态时的塑性屈服分布及压缩、拉伸极限强度的影响。  方法  针对某同一尺寸加筋板，采用ANSYS软件开展轴向循环压缩、循环压缩−拉伸载荷下的极限承载性能非线性有限元数值模拟。  结果  结果显示，不同的材料属性对加筋板极限承载性能及极限状态时的塑性屈服分布具有显著影响；在开展船体加筋板极限承载性能非线性有限元数值模拟时，需要根据不同的载荷形式选择恰当的材料模型。  结论  所得结果对进一步研究船体结构在循环载荷作用下的极限强度特性及累积塑性破坏机理具有一定的参考价值。

Ultimate longitudinal strength

  Objectives  In order to improve the accuracy of nonlinear numerical simulation of the ultimate load-bearing behavior of a hull stiffened plate, the effects of ideal elastoplastic, isotropic hardening and cyclic plastic Chaboche material models on the plastic yield distribution, compression and tensile ultimate strength of stiffened plates in their ultimate state are studied.   Methods  For a stiffened plate of the same size, ANSYS software is used to carried out non-linear finite element numerical simulation of ultimate bearing performance under axial cyclic compression and cyclic compression-tension loads.   Results  The results show that different material properties have a significant impact on the ultimate bearing capacity of stiffened plates and the plastic yield distribution in the ultimate state. When carrying out nonlinear finite element numerical simulation of the ultimate bearing behavior of a hull stiffened plate, it is necessary to select the appropriate material model according to different load forms.   Conclusions  The results of this study can provide valuable references for further research on the ultimate strength characteristics and cumulative plastic failure mechanisms of hull structures under cyclic loading.