航空学报 > 1991, Vol. 12 Issue (12): 631-634

复合材料层压板的安全系数与可靠度

羊姈1, 马祖康1, 符国政2   

  1. 1. 西北工业大学 ;2. 飞机结构热强度研究所
  • 收稿日期:1991-04-29 修回日期:1991-06-15 出版日期:1991-12-25 发布日期:1991-12-25

SAFETY FACTOR AND RELIABILITY FOR COMPOSITE LAMINATES

Yang Ling1, Ma Zukang1, Fu Guozheng2   

  1. 1. Northwestern Polytechntcal University;2. Institute of Aero Structure Thermal Strength
  • Received:1991-04-29 Revised:1991-06-15 Online:1991-12-25 Published:1991-12-25

关键词: 复合材料层压板, 综合可靠性, 安全系数

Abstract: In the aircraft design the safety factor / is a design limit load of struc-turs in the ultimate load of structure. It provides guarantee for certain degree of safety. In fact, from the reliability design point of view, both the strength and load are random variables obeying certain distributions. Therefore, the concept of simple safety factor of reliability fx is introduced. It concerns with coefficient of variation of normal distribution and reliability index and it only adopts to simple elements or a single failure mode of a structure. For composite laminates the concept of comprehensive reliability safety factor based on reliability analysis is presented and its rangs is given. Comprehensive reliability safety factor relates to the disperse degree of strength and load and the value of required reliability. Several failure modes of laminate, different load group and the effect of structural parameters of laminate are also considered. The application of comprehensive reliability safety factor is convenient as general safety factor and its characteristics is better than simple safety factor of reliability.

Key words: composite laminate, comprehensive reliability, safety factor