Views: 1 Author: Site Editor Publish Time: 2021-09-22 Origin: Site
The basic mechanical properties of FRP are the basic materials that must be mastered in the design of FRP products. In FRP materials, glass fiber is the main component that bears the load, and the role of resin is to transfer stress and support and fix the fiber. Therefore, its mechanical properties depend on the fiber. The mechanical properties of resin and resin depend on their content ratio, reinforcement method and the state of the interface between these two materials. The state of the interface is a relatively complex influencing factor, and its influence on the performance of FRP cannot be quantitatively evaluated at present.
Unless otherwise specified, we generally discuss the mechanical properties of fibers and resins under normal temperature and static load conditions, such as elastic modulus, strength limit, etc.
As everyone knows, the strength of flat glass is relatively low, the tensile strength is about 69 MPa (700 kg/cm2), and the laboratory strength of glass fiber can reach up to 7250 MPa (74,000 kg/cm2). Because glass fiber has only a small cross-sectional area, the possibility of block sinking (such as microcracks) is much smaller than that of bulk materials, so the strength of the fiber in its length direction is much higher than that of bulk materials. The table lists Comparing the performance of various glass fibers with A3 steel, E glass fiber is an alkali-free fiber with good heat resistance and electrical insulation; S glass fiber is a high-strength and high-elastic fiber; C glass fiber is a medium alkali fiber; A glass fiber is There are alkali fibers.
The test strength of the fiber is measured by the breaking force, the tensile strength is calculated according to the breaking force, and the cross-sectional area of the fiber can be calculated according to the definition of the count:
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