大型空间结构材料性质退化和结构损伤

就材料性质的退化对大型空间结构动力响应的影响以及大型空间结构在轨损伤评估两个问题进行简要论述。损伤通常在复合材料中发生。对典型的空间桁架结构研究表明:材料性质的退化将引起固有频率的降低,并对振型有显著影响。介绍一种应用在轨响应测量的理论来评估结构系统损伤的发生、位置和程度。以天线桁架为例说明此理论的应用。

DEGRADATION OF MATERIAL PROPERTIES AND DAMAGE ASSESSMENT FOR LARGE SPACE STRUCTURES

In this paper,the special themes which include effect ofdegradation of material properties on the dynamic response of largespace structures(LSS)and damage assessment for LSS have been dealtwith.This damage is usually observed in fibrous composite media.Delicatestudies implemented on representative space truss structures indicate thatdegradation of material properties will result in a reduction of naturalfrequencies and may have important effects on the mode shapes.A theoryfor assessing the occurrence,location,and extent of potential damageusing on-orbit response measurements is presented.A MAST truss is usedas an example.The damages to the structural system for the sampleproblem have been identified and the extent of the damage quantified.