板壳结构满应力设计及在MSC/Nastran软件上的实现

根据满应力准则和板壳结构的应力与内力的关系,推导了求解板壳结构满应力设计的迭代关系式。采用无量纲设计变量实现变量连接,一个设计变量可以控制多个不同厚度的单元,扩大了程序的适用范围。在MSC/Nastran软件的基础上开发了适用于多工况、多变量的板壳满应力优化程序。利用Nastran的开放性,借助Pat-ran提供的PCL(Patran Command Language)开发环境,程序完全和Patran及Nastran融为一体。首先在Patran中建立有限元模型,利用Nastran进行有限元分析,按照满应力准则对设计变量调整,然后再次利用Nastran进行分析,这样反复迭代直到结构重量收敛。数值算例表明算法的可靠性、精确性和高效性,程序能够满足工程实际需要。

Full Stress Design of Plate Shell Structures and Implementation on MSC/Nastran Software

According to the full stress criterion and the relation between stress and internal force of plate shell structures the iterative formula for the full stress design of plate shell structures was deduced.The design variables were linked with dimensionless design variables,so a design variable can control many elements with different thickness and the application range was extended.Based on MSC/Nastran software,the full stress optimization software for plate shell structures was secondly developed,which is applicable to the problem with multiple variables under multiple loading cases.With the opening of MSC/Nastran and PCL(Patran Command Language) environment of MCS/Patran,the software is in harmony with Patran and Nastran completely.The element finite model was established with Patran and the element finite analysis was finished with Nastran.According to the full stress criteria,the design variables were modified.The element finite analysis and the full stress design repeated until the structural weight was converged.The numerical examples show that the algorithm is robust,reliable,and efficient,and the program satisfies the requirement of engineering application.