复合材料层压板刚度退化反问题研究.pdfVIP

Journal of Mechanical Strength 2010, 32( 3) : 415-418 X INVERSE PROBLEM STUDY OF COMPOSITESLAMINATE STIFFNESSDEGENERATE XX ( 西北工业大学航空学院, 西安710072) ZHANG BoPing ( School of A eronautics , N orthwestern Polytechnical University , X ican 710072, China) , , , TB33 TB115 Abstract The stiffness of fiber reinforced composite laminates will degrade under static tension or tensionPtension fatigue load. The properties of stiffness degradation are necessar to estimate static strength or fatigue life for composite laminates. A new inverse method of computation lamina stiffness degradation is presented for composites laminate based on linear neural networks and composites mechanics theor . Reduced stiffness properties of the damage lamina can be obtained according to the actual strain in the composite laminate under plane loads. The elastic moduli values of lamina b calculating in terms of experiment datum are used to demonstrate the effectiveness of the method. Key words Co posites; Stiffness degradation; Neural networks; Inverse proble Corresponding author: ZHANG BoPing, E-mail: zhangbp@nwpu. edu. cn, Tel: + 86-29 Fax: + 86-29 Manuscript received in revised form [ 3-4] , , 1 155- 185 ; [ 5] DF( degrada- , tion factor) , , , , G. AkhrasW.