The soft coil problem observed in the production of laminate coils is shown in Fig.1. The factors influencing the formation of a soft coil include: sheet properties, winding tension, lubrication and cardboard stiffness. The objective of the present study is to quantify the contribution of each factor to deformation of a finished coil under gravity load. The approaches adopted in this study include: stress analysis of a finished coil, development of an equivalent material model to capture the deformation behavior of the coil and a multi-layer finite element model to compute the deformation of a finished coil under gravity load considering the non-uniformity of stress distributions in the coil, as shown in Fig.2.
Sponsored by : Material Sciences Corporation.
Publications
- Cao, J., Li, Shunping, Xia, Z.C. and Tang, S.C. (2000) "Optimization of Multi-Step Deep Drawing Processes Using Inverse and Incremental Finite Element Analysis", Journal of Materials Processing Technology Vol. 117, pp193-200. Abstract Full Paper
- Cao, J., Li, Shunping (2001) "Enhancement of a Coil Using a Cardboard Core" ASME International Mechanical engineering Conference & Exposition, West Lafayette, Indiana.
- Cao, J., Li, Shunping (2002) "A study on the stress distribution in coil wrapping and its effect on final coil deformation" Proceedings of NAMRC XXX, soft coil phenomenon- Part I: Stress analysis and Part II: Coil deformation" submitted to International Journal of Mechanical Sciences.
