Analysis of spring-in of U-shaped composite parts with drop-off plies by FEA-RSM

Abstract

In this work, we used finite element analysis method (FEA), response surface methodology (RSM), and Sobol sensitivity analysis method to investigate the factors affecting the spring-in of U-shaped composite parts with drop-off plies. A FEA was introduced to calculate the spring-in, and demonstrated by two case parts of T300/8552 and T800/AC531. A mathematical model based on FEA-RSM was established by analyzing flange parameters, material properties, the size of the drop-off area, and its distance from the cross-section. In addition, all the factors were compared and ranked by sensitivity analysis. Finally, the parameters of the drop-off area were optimized.

Keywords:

• U-shaped composite part
• drop-off plies
• spring-in
• finite element analysis method
• response surface methodology
• parameters optimization

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.

Additional information

Funding

This work was supported by National Natural Science Foundation of China (Grant No. 11902256) and Natural Science Basic Research Program of Shaanxi Province (Grant No. 2019JQ-479).