A New Method for Measuring Bonding Shear Properties of Adhesives on Steel Substrates |
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Authors: | QUAN Xue-you LIU Lian-jie WANG Ren-yan MA Song YAN Yong |
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Affiliation: | College of Civil Engineering,Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing 400045,P.R.China;College of Civil Engineering, Ministry of Education, Chongqing 400045,P.R.China;College of Civil Engineering, Ministry of Education, Chongqing 400045,P.R.China;Chongqing Architectural Design Institute,Chongqing 400015, P. R. China;No.1 Engineering Company of China Railway No.8 Engineering Group Co.,Ltd, Chongqing 400050, P. R. China |
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Abstract: | Single-lap-joint adhesively bonded metal specimen which is the national standard experimental method in use has an extremely non-uniform distribution of shear stresses along the joint, and tensile stress concentration of high values is produced on the steel substrate interfaces. Therefore the test result, which is not the real bonding shear strength between adhesive and steel substrates, can only be used as a test index for qualities of adhesives not the strength criterion for load is capacity evaluation. The combined bonding disc specimen is adopted for measuring bonding shear properties of adhesive on steel substrates, has a very uniform distribution of shear stresses in adhesive and along the bonding surfaces of steel substrates, of which the uniform coefficient is greater than 0.97. Furthermore, when adhesive joint is treated as an arc and steel substrates are chamfered at both ends of the joint, tensile stresses on the bonding surfaces can be reduced to less than 20 MPa which can hardly cause tensile failure. Thus, the results of combined bonding disc specimens can actually represent the real bonding shear strength or bonding shear-compression strength between adhesive and steel substrates, which can be used as strength criterion for load capacity evaluation of bonding members. |
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Keywords: | adhesive steel substrates bonding shear properties combined bonding disc specimen |
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