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The mechanical properties of this resin matrix composites

Mechanical properties of materials is the most important performance. Resin matrix composite material has high specific strength, modulus, fatigue resistance and other advantages, is used for bearing structure of the resin matrix composite materials is the use of its excellent mechanical properties, and the use of functional composites with various functions of physical, chemical and biological, in the manufacture and use of the process, must also be considered the mechanical properties, in order to guarantee the quality and the service life of the product.

1, the resin matrix composite stiffness

In nature, the stiffness characteristics of resin matrix composites by the component materials reinforced material orientation and the occupied volume fraction determined. Mechanics of composites showed that, for the resin matrix composite macroscopically homogeneous, elastic properties of the composite is a kind of mixed effect, show mixed law in various forms, it is the average of the constituent materials rigid in the sense of the role of interface defects, it is not obvious.

Due to the influence of the manufacturing process, the random factors in actual composites, there exists all kinds of heterogeneity and discontinuity, residual elastic properties, void, crack force, interfacial bonding imperfections will affect materials. In addition, fiber (particle) uniformity of appearance, regularity, distribution will also affect the elastic properties of materials. But overall, resin matrix composite stiffness is the macroscopic reflection phase material stability.

For the composite laminated structures, different materials and properties of single and ply based on can appear coupling deformation, the stiffness analysis of complicated. On the other hand, can also through the elastic constants of single layer (including the elastic modulus and Poisson's ratio) were designed, and then select the ply orientation, number and sequence of the laminated structure stiffness design, to meet the requirements of different applications.

2, the resin matrix composite material strength

The strength of the material first and destruction together. Resin matrix composite material damage is a dynamic process, and the complex failure modes. The component properties influence action mechanism, on the destruction of various defects on the strength, has the street to in-depth study of specific.

Resin matrix composite strength of the composite is a kind of synergistic effect, performance and resin matrix composite material from the group's microstructure derived its strength properties. For the simplest case, that of unidirectional composites strength and fracture micromechanics, is not mature enough.

Axial unidirectional composites tensile, compressive strength ranging, axial compression problem is more complex than the tension. The damage mechanism and tension is different, it is accompanied by local buckling of fiber in the matrix. Experimental results: unidirectional composites under axial compression, carbon fiber is shear failure; Kevlar (Kevlar) failure mode fiber is a kink; glass fiber is bending failure.

The transverse tensile strength of unidirectional composites and compressive strength are also different. Experiments show that, the transverse tensile strength of transverse compressive strength is 4 ~ 7 times. Failure mode of transverse tensile is to destroy the matrix and interface, may also be accompanied by a transverse tensile fiber; transverse compressive failure is due to damage caused by the matrix, roughly along 45 ° bevel cut bad, sometimes accompanied by interfacial failure and fiber crushing. Unidirectional composites in plane shear failure is caused by matrix and interfacial shear strength, estimation of these numerical experiments are required to rely on.

Random short fiber reinforced resin matrix composites although do not have high strength axial unidirectional composites on, but in the transverse tensile, compressive properties than unidirectional composites is much better, has its own characteristics in the aspects: failure mechanism of woven fiber can be approximately regarded as two layers of laminated materials in mechanical processing reinforced resin matrix composite material, but in the microcosmic mechanism of fatigue, injury, damage to more complex.

Synergistic effect of strength properties of resin matrix composites but also the performance of hybrid effect effect and hybrid composites in the laminate layer. In the laminated structure, strength of potential strength of the monolayer demonstrated with single stress of different, such as the transverse strength of 0/90/0 laminated stretch from 90 ° layer is the single individual experimental results of the transverse tensile strength of 2 ~ 3 times; so the in-plane shear strength, this phenomenon is called laminated effect.

The distribution of intensity of composite resin complexity problem from the possible anisotropy and irregular, environmental effects such as usual, but also from the above mentioned different failure modes, and the same material in different conditions and different environment, fracture may be carried out by different ways. These include the matrix and fiber (particle) of the structural changes, such as due to the effects of local weak points, hole, stress concentration caused by. In addition, the interfacial bond properties and strength, accumulation of dense, fiber, fiber lap at the end of the stress concentration, the crack growth disturbance and plastic and elastic response differences have a certain impact.

The physical properties of this resin matrix composites

The physical properties of resin matrix composites are mainly thermal properties, electrical properties, optical properties, magnetic properties, friction properties (see table). For non functional composite materials mainly use the mechanical properties in general, to consider the response in the specific conditions of use materials on the environment of various physical factors, as well as the response of mechanical properties and comprehensive properties of composite effect; while for functional composite materials, pay attention to

 
 

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