High Resolution Optical Interference Investigation of Swelling Due to Water Uptake by Model Adhesive Joints

摘要: Abstract Fully cured resin adhesives swell when they absorb water. By manufacturing a model butt joint between thin, and therefore flexible, microscope cover slip as one adherend massive, rigid, slab of glass the other adherend, development swelling can be observed measured by generating Moire images from photographs pattern optical interference fringes formed in gap an flat free surface slip. The is strongly inhomogeneous this inhomogeneity gives rise to distribution stress normal which compressive near both rim centre, tensile within annular region located centre. It has been demonstrated that stresses large enough cause fracture developed. Regularly spaced radial perturbations boundary unswollen swollen adhesive have film contains carrier cloth.