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Tensile mechanical properties in PP/SEBS/Microballon composites under impact loadings

Mae H.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 31, nr 2

341-347

Purpose: The mechanical properties of the syntactic polymer foams at the intermediate and high strain rates were not understood comprehensively. Then, this study characterizes the tensile mechanical properties of the polymer syntactic composites at high strain rates. Design/methodology/approach: Eight kinds of syntactic foams and one neat PP/SEBS specimens are prepared at the same manufacturing process: 0, 2, 4, 8, 10, 20, 30, 40 and 50 volume percents of microballoons in the PP/SEBS blend matrix. Tensile tests are conducted at strain rates ranged from 0.3 to 100 s-1. Apparent elastic modulus, yield stress and rupture strain are measured and the effects of microballoons on the mechanical properties are studied. In addition, the experimental results are compared with analytical model for closed-cell foam and the effects of the density of the PP/SEBS/microballoon composite on both apparent elastic modulus and yield stress are discussed. Findings: The apparent elastic moduli of PP/SEBS/microballoon syntactic composites follow the Gibson-Ashby law at the nominal strain rate of 100 s-1. The yield stress of PP/SEBS/microballoon syntactic composites follow the simple rule of mixture at the relative densities larger than 0.9. The material ductility decreases drastically once the microballoons are blended in the matrix material. Research limitations/implications: The influence of the local strain rate caused by the heterogeneous microstructure on the mechanical properties is to be further explored. Practical implications: In the automobile applications, the thermoplastic polymer syntactic foams are believed to have many advantages because the usual commercial extruders or injection moulding machines are applicable for producing them, leading to the more light-weight polymeric components. Originality/value: The present study investigates the effects of the strain rate and density on the tensile mechanical properties comprehensively in the polymer syntactic foams.