14 April 2010 An improved method for testing tension properties of fiber-reinforced polymer rebar
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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752261 (2010) https://doi.org/10.1117/12.848192
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore
Abstract
We have conducted a series of tests to measure tensile strength and modulus of elasticity of fiber reinforced polymer (FRP) rebar. In these tests, the ends of each rebar specimen were embedded in steel tube filled with expansive cement, and the rebar was loaded by gripping the tubes with the conventional fixture during the tensile tests. However, most of specimens were failed at the ends where the section changed abruptly. Numerical simulations of the stress field at bar ends in such tests by ANSYS revealed that such unexpected failure modes were caused by the test setup. The changing abruptly of the section induced stress concentration. So the test results would be regarded as invalid. An improved testing method is developed in this paper to avoid this issue. A transition part was added between the free segment of the rebar and the tube, which could eliminate the stress concentration effectively and thus yield more accurate values for the properties of FRP rebar. The validity of the proposed method was demonstrated by both experimental tests and numerical analysis.
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Guoqing Yuan, Guoqing Yuan, Jian Ma, Jian Ma, Guohua Dong, Guohua Dong, } "An improved method for testing tension properties of fiber-reinforced polymer rebar", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752261 (14 April 2010); doi: 10.1117/12.848192; https://doi.org/10.1117/12.848192
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