Papers by Author: Hui Min Li

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Authors: Qin Zhi Fang, Tie Jun Wang, Hui Min Li
Abstract: Large deformation performances of polycarbonate (PC) and PC/ABS (Acrylonitrile Butadiene Styrene) have been investigated experimentally in this paper. The displacement fields of these polymers are measured with a system based on digital image correlation (DIC) method. The variations of strains during tension are measured and the true stress-strain curves are presented. For these materials, it is observed that the contraction in thickness is larger than that in width during tension. No obvious stress softening is observed in the true stress-strain curves. The true stress-strain curves can be fitted well with three-stage model.
Authors: Hui Min Li, Qin Zhi Fang, Tie Jun Wang
Abstract: As a direct and simple method, essential work of fracture has been widely used for fracture measurement of ductile polymers. In this paper, fracture toughness of PC and PC/ABS alloy is experimentally investigated. A series of double edge-notched tension (DENT) specimens and essential work method are employed to measure the fracture toughness of PC and PC/ABS alloy. By the way, the critical crack tip opening displacement is obtained. Moreover, the fracture surfaces of DENT specimens are examined by using a scanning electron microscope (SEM).
Authors: Qin Zhi Fang, Tie Jun Wang, Hui Min Li
Abstract: The tensile property of PC/ABS was investigated with an optical image analysis method in the paper. With the consideration of polymer micro mechanism, a three-stage phenomenon based model is used to describe the true stress-strain curves. The regression constants obtained with the method could be described with definite physical meanings. It is shown that two lateral contractions are not identical at the later necking stages. The fracture strain could be used as a criterion to describe uniaxial tensile fracture.
Authors: Nan Lv, Hui Min Li
Abstract: The rebar-planting anchoring , based on the development of the technology in the field of architecture both at home and abroad and applications, and combining with the mechanics performance of planting-bar, , technical requirement and the anchoring depth of the relevant specification, for the imperfections in the application of this new technology put forward the corresponding improvement suggestions.
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