Stress Analysis of Adhesive Scarf Joints of Steel Plates in Pure Bending and Contraction of Adhesive by Finite Element Method

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Two-dimensional elastic stress analysis in plane strain state has been made for adhesive scarf and butt joints. Bending stresses in adhesive layers at distances greater than several times the layer thickness from the free surfaces show almost linear distributions and are zeros near the mid-width of joints. Maximum principal stresses caused by contraction of adhesive are uniform in the region of adhesive layers greater several times the thickness away from free surfaces and their directions agree with the longitudinal directions of adhesive layers. Distributions of bending stresses corrected for the stress gradients by bending and stress distributions caused by contraction of adhesive show mutual similarity in the vicinity of the free surfaces of adhesive show mutual similarity in the vicinity of the free surfaces of adhesive show mutual similarity in the vicinity of the free surfaces of adhesive layers provided the aspect ratios of the adhesive layers are greater than 20 (bending) or 10~20 (contraction). Maximum stresses in both cases appear at the corners of free ends of the layers. Bending stresses in this analysis almost agree with those analyzed by photoelastic method.
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