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- Title
Coordinative optimization method of composite laminated structures based on system reliability.
- Authors
Ma, Yujia; Wang, Xiaojun; Shi, Qinghe; Ren, Qiang
- Abstract
This paper develops the coordinative optimization method based on system reliability for laminated structures. The proposed method improves the rough RBO based on first layer failure (FLF) criterion for composite laminates, and the coupling optimization method of thickness and sequence in traditional RBO strategy based on last layer failure criterion (LLF) is improved. In this paper, the finite element analysis is used to obtain the response for the failure based on two-dimension Hashin failure criterion (the limit function). Obviously, the stiffness of composite materials will decline due to destruction of elements. Therefore, stiffness degradation is considered to describe the process of damage evolution. Subsequently, combining with the branch-bound method (B&B), we can complete the search of main failure sequences and calculate the system reliability with the help of the second-order upper bound theory. In order to guarantee the efficiency and accuracy of optimization, the adaptive GA algorithm is introduced in the whole optimization procedure. After the proposed optimization policy is given in detail, two laminated structures are presented and the results are compared with the traditional optimal method based on safety factor, which demonstrates the validity and reasonability of the developed methodology.
- Subjects
LAMINATED materials; RELIABILITY in engineering; COMPOSITE structures; FINITE element method; SAFETY factor in engineering
- Publication
Structural & Multidisciplinary Optimization, 2019, Vol 59, Issue 5, p1483
- ISSN
1615-147X
- Publication type
Article
- DOI
10.1007/s00158-018-2141-x