SEMI-ANALYTICAL SPRING-IN ANALYSIS TO COUNTERACT CFRP MANUFACTURING DEFORMATIONS BY TOOL COMPENSATION

摘要

Within this paper an excerpt of a comprehensive experimental test program is presented which accounts for the main drivers of spring-in deformations. Therein, it is focused on the effect of layup and part-radii changes on the occurring spring-in deformations of fully cured parts. By means of full-field geometrical measurements, the thermal fraction of the spring-in deformation is experimentally quantified. Experimental findings are validated using an analytical approach by Radford. Furthermore, a new semi-analytical shell-element-based simulation strategy is proposed which focuses on the prediction of man ufacturing induced part deformations. Therein, necessary parameters are derived from simple test specimens, which lead to a comparably simple procedure, which should support tool designers in their daily work. Finally, the developed approach is applied to a C-profile part and experimentally validated.