The paper introduced three displacement potential functions and derived a fundamental solution for an unidirectional composite material which is a typical transversely isotropic elasticity. Based upon Betti's elastic reciprocal theorem,a boundary element method with isoparameter elements for the 3-D transverse isotropic elasticity was developed.

FRP has the properties of distinguished mechanics performance and chemical stability. Moreover as unidirectional composite material, FRP possess tenacious fatigue resistance. Therefore FRP has also been widely used in strengthening structures bearing fatigue load.

The paper introduced three displacement potential functions and derived a fundamental solution for an unidirectional composite material which is a typical transversely isotropic elasticity. Based upon Betti's elastic reciprocal theorem,a boundary element method with isoparameter elements for the 3-D transverse isotropic elasticity was developed.

About optimization of the elastic deformation range by prestraining of a unidirectional composite material (Discussion of refere

Both shear-loaded and end-loaded compression test methods were used to measure the strength and stiffness of carbon/epoxy and glass/epoxy unidirectional composite material systems.

Influence of specimen gage length and loading method on the axial compressive strength of a unidirectional composite material

The authors examined the problem of the effect of the mechanical characteristics of a unidirectional composite material and of winding methods on the position of the optimum reinforcement trajectories.

Method of primers in calculating the probability of destruction of a unidirectional composite material in tension

In this paper the relation of effective thermal conductivity of fiber reinforced unidirectional composite materials (FRCM) with the kinds of fiber and matrix materials, volume fracture and arrangement of fiber in the composite was investigated.According to the electro-thermal analogy, were deduced the equationsandwhere is the thermal conductivity of ERCM in the direction parallel to the fiber, it may be perceived in equation (1) ,that conforms to rule of mixtures; is the thermal conductivity...

In this paper the relation of effective thermal conductivity of fiber reinforced unidirectional composite materials (FRCM) with the kinds of fiber and matrix materials, volume fracture and arrangement of fiber in the composite was investigated.According to the electro-thermal analogy, were deduced the equationsandwhere is the thermal conductivity of ERCM in the direction parallel to the fiber, it may be perceived in equation (1) ,that conforms to rule of mixtures; is the thermal conductivity of FRCM in the direction perpendicular to the fiber. Equation (2) shows that depends on the factor of fiber arrangement n considerably. The thermal conductivities of ' specimens with different fiber volume fract'ors and arrangements have been measured by the method of constant heat flow under different temperatures. The measurements were made on carbon fiber aluminium unidirectional composites. The results of measurements show that the thermal conductivities of C/A1 composite reduced with increase of fiber volume fraction and increased with increase of temperature. Also observed that the fabrication technology of, composite, in a certain degree, had influence on thermal conductivities too. The measured thermal conductivities were very close to the calculated values obtained from the preceding equations. It confirmed that equations deduced in accordance with electro-thermal analogy are dependable. They may be used to predict the thermal conductivities of composite and to design the composite with different thermal conductivities.

A model of energy release rate for fracture in unidirectional fiber-reinforced composite materials is presented. From the observations in experiments, a fracture criterion for crack initiation in off-axis unidirectional composite materials is proposed. It includes two assumptions: ( 1 ) Crack initiation takes place in the direction of fibers; (2) Rapid crack growth occurs when the energy release rate reaches a critical value, G= G. The model is also used to analyze the mixed-mode fracture...

A model of energy release rate for fracture in unidirectional fiber-reinforced composite materials is presented. From the observations in experiments, a fracture criterion for crack initiation in off-axis unidirectional composite materials is proposed. It includes two assumptions: ( 1 ) Crack initiation takes place in the direction of fibers; (2) Rapid crack growth occurs when the energy release rate reaches a critical value, G= G. The model is also used to analyze the mixed-mode fracture of a kind of glass-epoxy unidirectional composite with crack. The results indicate that the loads corresponding to fracture predicted by the model when crack orients at some angle with respect to the fiber direction agree well with the experimental results.

The paper introduced three displacement potential functions and derived a fundamental solution for an unidirectional composite material which is a typical transversely isotropic elasticity. Based upon Betti's elastic reciprocal theorem,a boundary element method with isoparameter elements for the 3-D transverse isotropic elasticity was developed. Finally, two examples were calculated for illustration. Especially, the method was applied for analyzing the stress concentration of an unidireetional composite...

The paper introduced three displacement potential functions and derived a fundamental solution for an unidirectional composite material which is a typical transversely isotropic elasticity. Based upon Betti's elastic reciprocal theorem,a boundary element method with isoparameter elements for the 3-D transverse isotropic elasticity was developed. Finally, two examples were calculated for illustration. Especially, the method was applied for analyzing the stress concentration of an unidireetional composite material with a center hole under extension.