Cross-sectional area of fiber: A 1=A*V 1

Cross-sectional area of matrix: A2=A*V2

If the strain is ε, the tensile force of the composite is ε * e1* a1+ε * E2 * A2 = ε * e * (a1+A2) = F.

Solution: e = (e1* v1+E2 * v2)/(v1+v2).

In the stage of elastic deformation, the sum of stresses of materials should be in direct proportion (that is, it conforms to Hooke's law), and its proportional coefficient is called elastic modulus. The unit of elastic modulus is dyne per square centimeter. "Elastic modulus" is a physical quantity that describes the elasticity of matter, and it is a general term, which can be expressed by "Young's modulus" and "bulk modulus".

Extended data

There is little difference in elastic modulus of various steels, and metal alloying has little effect on its elastic modulus.

1 MPa = 145 psi = 10.2 kgf/cm2 = 10 bar) =9.8 atm.

1 psi = 0.006895 MPa) =0.0703 kgf/cm2 = 0.0689 bar) = 0.068 atm.

1 bar = 0. 1 MPa = 14.503 psi = 1.0 197 kgf/cm2 = 0.987 atm.

1 atmospheric pressure = 0. 10 1325 MPa = 14.696 psi = 1.0333 kgf/cm2) = 1.008.

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