MULTISPRING REPRESENTATION OF （MULTISPRING表示）.pdf

MULTI-SPRING REPRESENTATION OF FASTENERS FOR MSC/NASTRAN MODELING ∗ ** Alexander Rutman , Ph. D, Joseph Bales-Kogan, M. Sc. Boeing Commercial Airplane Group Strut Structures Technology MS K95-04 3801 South Oliver, Wichita, Kansas 67210 ABSTRACT The paper describes a particular modeling approach for 3-dimensional representation of fastener joints developed for MSC/NASTRAN. Different physical properties of plate-fastener systems are analyzed separately and interaction between them is established. Calculations of the system properties are shown, as well as the technique of their application in models. Description of a program automating generation of additional cards required by the method is included. The procedure is illustrated with an example showing both an application of the method and results of FEA based on its implementation. ∗ Lead engineer. ** Stress analyst. 1 INTRODUCTION Generally, distribution of loads through the structure depends not only on the mechanical properties of selected materials and dimensions of its components but also on stiffness of the fasteners connecting them. Therefore, more realistic finite element analysis results can be obtained when components of a model are connected by elements representing stiffness of the joints. The procedure below describes the stiffness analysis and modeling technique for 3-dimensional fastener joint representation, including description of a program for generation of additional b