Materials Reports 2019, Vol. 33 Issue (Z2): 210-214 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Progress in Test Methods of Impact Properties of Adhesives |
YOU Min1, LI Mingbo2, YUAN Youlu1, LIN Gao2, YU Haizhou1
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1 Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance, China Three Gorges University, Yichang 443002; 2 Hubei Lidi Machine Tool Co., Ltd, Yichang 443001 |
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Abstract The applications domain of the structures produced with the adhesives have been become more and more wide in civil construction, transporting, electricity industry for its advantages of mean in stress distribution, good in sealing performance, lower in cost and greater versatility. The adhesive bonded structure may be failed in different type from the one under static load when it was subjected to the dynamic or impact load. It is important to investigate and improve the test methods continuously so that the impact property of the adhesives and the adhesive joints could be evaluated accurately to ensure the structure good in reliability. Since the influencing factors of the impact property are much more and the polymers are sensitive to the strain rate they undergo, different phenomena can be induced when a load is applied abruptly on the bonded structure. It is difficult to distinguish the component energy needed for the crack propagation in the adhesive layer from the total absorbed energy in the testing and the progress in this domain is relatively slow. In the past years, impressive strides have been made in promoting the revision and improvement to the standards published for determination the impact strength of the adhesives. And some advances have been achieved in the investigation of non-standard test methods for determination of the impact property of the adhesives. The main progress achieved in the standard test methods is “instrumented impact test” which implied the test data (such as force, velocity of the impactor) were recorded automatically and the deflection of the specimen might be calculated out so that the curves of force-deflection or force-time could be drawn out after the testing.And some advances have been obtained in the investigation of non-standard test methods using the specimen of the metal-adhesive butt joint and the method may be used widely in the future. The researches that have been previously undertaken in the fields of block impact test methods for measuring the impact property of the adhesively bonded joints were reviewed in this document. The shortages or limitations of the standard test methods for determination the impact property of the adhesives are discussed. Based on the analysis of the test standard and the research results achieved, the recommendations to improve the two domestic standards for determination the impact property of the adhesives are proposed. The tentative application of both the three point bending (Charpy) and the cantilever bending (Izod) test using the metal adhesive butt joint in determining the impact property of the adhesive is also discussed.
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Published: 25 November 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (50975160), Key Project of Hubei Natural Science Foundation, China (2014CFA123). |
About author:: Min You received his B.S., M.S., and Ph.D. degrees of Science in Engineering from Huazhong University of Science and Technology in 1982, 1986 and 2002, respectively. In 1997, he became a professor at Yichang campus of Wuhan University of Hydraulic and Electric Engineering. He founded the Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance in China Three Gorges University at the end of 2008. His research interests include mechanical behavior of mate-rials, residual stress of welding structure, adhesively bonded metal structure. |
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