This paper presents a constitutive thermoviscoelastic model for thin films of linear low-density polyethylene subject to strains up to yielding. The model is based on the free volume theory of nonlinear thermoviscoelasticity, extended to orthotropic membranes. An ingredient of the present approach is that the experimentally inaccessible out-of-plane material properties are determined by fitting...

In order to improve the fatigue test accuracy and efficiency of full-scale structure wind turbine blades, an effective load matching method for blades under biaxial loading is proposed. The blade scheme designed. transfer matrix used calculate bending moment loading. particle swarm optimization algorithm designed optimize position mass excitation device in flap-wise edgewise directions position...

Valley lines on total-energy surfaces for the zone-center distortions of freestanding and in-plane strained SrTiO3 are investigated with a newly developed first-principles structure optimization technique [Jpn. J. Appl. Phys. 43 (2004), 6785]. The results of numerical calculations confirmed that the ferroelectricity is induced, and the Curie temperature is increased, by applying biaxial compres...

In this research, mechanical buckling of rectangular plates of functionally graded materials (FGMs) is considered. Equilibrium and stability equations of a FGM rectangular plate under uniform in-plane compression are derived. For isotropic materials, convergent buckling loads have been presented for non-uniformly compressed rectangular plates based on a rigorous superposition fourier solution f...

The nonlocal nonlinear buckling of a double layer graphene sheet (DLGS) covered by zinc oxide (ZnO) piezoelectric layers is investigated in this study. The surrounding circumstances of the system are considered as a Pasternak foundation including spring constants and a shear layer. Graphene sheets are subjected to longitudinal magnetic field and biaxial forces. On the other hand, the ZnO piezoe...

Measurements of the yield behaviour of a cohesive bulk solid in the Jenike shear tester are normally done in two steps. First, pre-shearing to a steady state yielding, and secondly, shearing under a lower normal stress to establish the shear stress at incipient failure. Due to the limited strain of the sample in this apparatus, the material must be consolidated in an earlier stage. This is done...

Abstract The accurate characterization of fabrics used in vacuum assisted resin transfer molding (VARTM) is essential order to model the flow through these porous preforms. A wide range are available for composite manufacturing VARTM and thus brings about a need opt methodology which characterizes in-plane permeability These values can then be simulations that track front progression mold filli...