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신동우(D. W. Shin),정동성(D. S. Jeong),장현규(H. K. Jang) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
Glass-Wool reinforced polymeric composites provide the desirable properties of high stiffness and strength as well as specific weight, hence, they have become some of the most important materials in several industries, most notably the automotive and aerospace industries. As a result, the study of the material behavior and forming techniques of such composites has attracted considerable attention in recent years. Even though many studies have been done on the stretch forming of metallic materials, very few have focused on the thermoplastic composites. One of the characteristics of stretch forming is that sheet material is prevented from wrinkling. This is especially important for long glass fiber reinforced composites because of their inherent tendency to buckle in compressive deformation. It is therefore very important to investigate the formability of this composite in biaxial stretch deformation. The objectives of this research have been to investigate the formability of thermoplastic composite sheet in biaxial stretch forming. Limiting strain in biaxial stretch forming were explored using the Deep Drawing test. Marciniak"s imperfection theory is used to predict the instability in biaxial stretching of composites.