Ms. Liangquan Zhang Profile

Liangquan Zhang

at China Earthquake Administration

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Proceedings Article | 28 April 2011 Paper

Investigation on mechanical behavior of filament-wound CFRP tubes

Hui Li, Liangquan Zhang

Proceedings Volume 7978, 79781Y (2011) https://doi.org/10.1117/12.880372

KEYWORDS: Composites, Carbon, Epoxies, Civil engineering, Fiber reinforced polymers, Mechanics, Failure analysis, Roads, Strain analysis, Chromium

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Firstly, two types of CFRP tubes are designed using the filament-wound forming technology. These tubes are winded by carbon fibers with a filament winding pattern of [(900/00)2]S. The compression and tensile test are also carried out to investigate the stress-strain relationship, ultimate strength and macroscopic failure mode of the former CFRP tube. The results demonstrate that the former CFRP tube has a much larger ultimate tensile stress and strain than compressive stress and strain. However, the elastic modules of CFRP tubes under tension and compression are similar and the failure mode of these CFRP tubes is brittle under compression and tension. Secondly, the stress and strain analysis method of filament-wound CFRP tube is investigated according to anisotropic elasticity theory and lamination theory of composite material. Then, the strength of carbon-fiber-reinforced plastic tubes is obtained. In addition, the comparison of theoretical analysis results and experimental results shows that the theoretical analysis results are reliable.

Proceedings Article | 11 April 2006 Paper

Static and ultimate state analysis of CFRP double-layer grids

Liangquan Zhang, Hui Li, Jinping Ou

Proceedings Volume 6174, 61743J (2006) https://doi.org/10.1117/12.660869

KEYWORDS: Composites, Chromium, Civil engineering, Fiber reinforced polymers, Safety, Carbon, Structured optical fibers, Aerospace engineering, Resistance, Actinium

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As increased in span, the selfweight and internal force of space structures in large span are also much increased, thus span of space structures is limited. Indeed, the lower weight of composite structures compared to conventional metallic structures achieves directly the weight reduction goal. Therefore, composites provide an alternative to replace conventional materials. In this paper, double-layer grids, one of the most popular space structures, are investigated. Firstly, the mechanical behaviors of CFRP tubes were studied. The design procedure of FW CFRP tubes subjected to axial loading in CFRP double-layer grids was proposed. And then, compressive and tensile strengths of series of CFRP tubes with variety of winding angles were presented. The results indicated that 0/90 lay-ups for CFRP tubes may be the best candidate. Secondly, based on identical deformation principle, CFRP double-layer grids, in which steel tubes were replaced by CFRP tubes, were designed. Thirdly, static and ultimate state analysis of CFRP double-layer grids and the same types of steel double-layer grids was carried out using the finite element program ABAQUS. The analytic results indicated that ultimate load-carrying capacity of CFRP double-layer grids is obviously higher than that of steel double-layer grids. It is seen from load-displacement curves that CFRP double-layer grids behave more brittle.

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