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Secondary stresses induced by shear movement in structural glazing sealants
Abstract The paper investigates the secondary stresses induced by shear movements in elastomeric structural glazing sealants. Typical values of Young's modulus and Poisson's ratio are derived from load-displacement curves measured for two structural glazing sealants (Dow Corning products). Using the primary stiffness properties in an analytical model based on the finite-element method, the stress distribution in a 10 mm×10 mm×50 mm joint subjected to transversal shear is calculated. Little difference is observed between the linear and non-linear models, as the sealant seems to respond nearly linearly to the small displacements considered in this study. The analytical model shows that the tension component $ σ_{22} $ exhibits a maximum at a level close to the adhesion interface and close to the joint edges. At this location in the adhesive joint, the tension component $ σ_{22} $ is approximately twice as large as the shear stress τ, which explains why structural glazing sealants tend to fail in shear tests close to the substrate surface.
Secondary stresses induced by shear movement in structural glazing sealants
Abstract The paper investigates the secondary stresses induced by shear movements in elastomeric structural glazing sealants. Typical values of Young's modulus and Poisson's ratio are derived from load-displacement curves measured for two structural glazing sealants (Dow Corning products). Using the primary stiffness properties in an analytical model based on the finite-element method, the stress distribution in a 10 mm×10 mm×50 mm joint subjected to transversal shear is calculated. Little difference is observed between the linear and non-linear models, as the sealant seems to respond nearly linearly to the small displacements considered in this study. The analytical model shows that the tension component $ σ_{22} $ exhibits a maximum at a level close to the adhesion interface and close to the joint edges. At this location in the adhesive joint, the tension component $ σ_{22} $ is approximately twice as large as the shear stress τ, which explains why structural glazing sealants tend to fail in shear tests close to the substrate surface.
Secondary stresses induced by shear movement in structural glazing sealants
Iker, J. (author) / Wolf, A. T. (author)
1992
Article (Journal)
English
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