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Micromechanics-based constitutive modeling for unidirectional laminated composites
Liang, Z.,Lee, H.K.,Suaris, W. Elsevier 2006 International journal of solids and structures Vol.43 No.18
<P><B>Abstract</B></P><P>A micromechanics-based constitutive model is developed to predict the effective mechanical behavior of unidirectional laminated composites. A newly developed Eshelby’s tensor for an infinite circular cylindrical inclusion [Cheng, Z.Q., Batra, R.C., 1999. Exact Eshelby tensor for a dynamic circular cylindrical inclusion. J. Appl. Mech. 66, 563–565] is adopted to model the unidirectional fibers and is incorporated into the micromechanical framework. The progressive loss of strength resulting from the partial fiber debonding and the nucleation of microcracks is incorporated into the constitutive model. To validate the proposed model, the predicted effective stiffness of transversely isotropic composites under far field loading conditions is compared with analytical solutions. The constitutive model incorporating the damage models is then implemented into a finite element code to numerically characterize the elastic behavior of laminated composites. Finally, the present predictions on the stress–strain behavior of laminated composite plate containing an open hole is compared with experimental data to verify the predictive capability of the model.</P>
Tensile Yield Behaviour of Glass Bead Filled LDPE Composites
Liang, J . Z .,Tang, C . Y .,Li, R . K . Y .,Wong, T . T . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
The effects of the filler size and the filler content on the tensile yield behaviour of glass bead filled low density polyethylene (LDPE) composites have been investigated employing an INSTRON materials tester at room temperature. The results show that the influence of the concentration and diameter of glass beads on the tensile yield stress and strain at yield state of the composites is insignificant. It indicates that the interfacial adhesion between the filler and the LDPE matrix is good.
Mechanical Properties of Polypropylene/CaCO3 Composites
Liang, J . Z .,Tang, C . Y .,Li, R . K . Y .,Wong, T . T . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
The effects of calcium carbonate (CaCO₃) content on the hardness, tensile and dynamic mechanical properties and impact strength of the filled polypropylene (PP) composites have been investigated in the present paper. The results show that the moduli and hardness of the composites increase with addition of CaCO₃ content, but the tensile strength and strain at break is opposite to this; there are extreme values of the tensile yield stress and lzod impact strength at 5% and 10% of CaCO₃ weight fraction, respectively. It indicates that the strength and toughness of PP can be improved to some extent when PP i s filled with suitable concentration of inorganic rigid particles.