Title: Experimental Investigation of Spring-back Behavior of Composite Sandwich Structures: Part One

Authors: Tien M. Vo, Jessica G. Poulsen, Aaron R. Palmer, and Lucas D. Stallbaumer

DOI: 10.33599/nasampe/s.19.1507

Abstract: Spring-back has been known as one of the major challenges in the composite structure manufacturing that often set the constraints on part manufacturability. The spring-back is thought to occur due to a combination of several factors: the non-symmetric or imbalanced structure of the part, thermal stresses that occur during the composite cure due to incompatibility of composite materials or due to the mismatch in the thermal expansion of the part and mold. The purpose of this paper is to present the experimental result from a case study that investigates the spring-back effects due to non-symmetric and imbalanced of a carbon fiber reinforced plastic (CFRP) composite sandwich structure. The study was conducted with both non-metallic and metallic cores. This paper also provides a methodology developed to evaluate the effects of the spring-back and discusses manufacturing solutions to reduce or eliminate the spring-back effects. Specific material and processing information are excluded in this paper to protect the proprietary data.

References: 1. Fernlund, G., Poursartip, A., Twigg, G., Albert, C. “Residual Stress, Spring-In and Warpage in Autoclaved Composite Parts.” SME Technical Paper, EM03-286 (2003). Society of Manufacturing Engineers. 2. Fernlund, G., Rahman, N, Courdji, R., Bresslauer, M., Poursartip, A., Willden, K., Nelson, K., “Experimental and numerical study of the effect of cure cycle, tool surface, geometry, and lay-up on the dimensional fidelity of autoclave-processed composite parts.” 33 (2002) 341-351. Composites Part A: Applied Science and Manufacturing. https://doi.org/10.1016/S1359-835X(01)00123-3

Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1507

Pages: 11

Price: FREE