Effect of strain rate on the dynamic tensile behaviour of UHMWPE fibre laminates |
| |
Institution: | 1. Advanced Composites Centre for Innovation and Science, University of Bristol, Queen''s Building, Bristol, BS8 1TR, UK;2. Defence Science and Technology Laboratory, Porton Down, Salisbury, SP4 0JQ, UK;3. Department of Aerospace Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK;4. Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK |
| |
Abstract: | Ultra-high molecular weight polyethylene (UHMWPE) fibre has great potential for strengthening structures against impact or blast loads. A quantitative characterization of the mechanical properties of UHMWPE fibres at varying strain rates is necessary to achieve reliable structural design. Quasi-static and high-speed tensile tests were performed to investigate the unidirectional tensile properties of UHMWPE fibre laminates over a wide range of strain rates from 0.0013 to 163.78 s?1. Quasi-static tensile tests of UHMWPE fibre laminates were conducted at thicknesses ranging from 1.76 mm to 5.19 mm. Weibull analysis was conducted to investigate the scatter of the test data. The failure mechanism and modes of the UHMWPE fibre laminates observed during the test are discussed. The test results indicate that the mechanical properties of the UHMWPE fibre laminate are not sensitive to thickness, whereas the strength and the modulus of elasticity increase with strain rate. It is concluded that the distinct failure modes at low and high strain rates partially contribute to the tensile strength of the UHMWPE fibre laminates. A series of empirical formulae for the dynamic increase factor (DIF) of the material strength and modulus of elasticity are also derived for better representation of the effect of strain rate on the mechanical properties of UHMWPE fibre laminates. |
| |
Keywords: | UHMWPE fibre Mechanical properties Thickness Strain rate Tensile test |
本文献已被 ScienceDirect 等数据库收录! |
|