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Theoretical Modeling of Bond-line Read-out in Adhesive Joined SMC Automotive Body Panels

Soumendra K. Basu

India Science Laboratory, General Motors R&D, ITPL Whitefield Road, Bangalore 560066, India, soumendra.basu{at}gm.com

Hamid G. Kia

Materials and Processes Laboratory, General Motors R&D, 30500 Mound Road Warren, MI 48090, USA

A visible deformation on the exterior surface of adhesive-joined automotive body panels along the adhesive application line is called bond-line read-out (BLRO). A 2D finite element model with isotropic linear elasticity and plain strain approximation for a plate/hat design was developed to investigate the physical phenomenon responsible for the formation of BLRO. It was found that a combination of process induced compressive stress on the outer side and tensile stress on the inner side of the exterior panel deforms it into a convex outward shape. The results of this work enables researchers to develop new strategies for reducing BLRO in adhesively bonded exterior panels.

Key Words: bond line read through • class-A surface • stress • deformation • sheet molding compound (SMC) • adhesive bonding • FEM model.

Journal of Composite Materials, Vol. 42, No. 6, 539-552 (2008)
DOI: 10.1177/0021998307088604
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S. K. Basu and H. G. Kia
Strategies to Reduce Bond-line Read-out in Adhesive Joined SMC Automotive Body Panels
Journal of Composite Materials, September 1, 2008; 42(17): 1801 - 1815.
[Abstract] [PDF]