In this paper, woven fabrics of glass fiber/carbon fiber intra-hybrid in plain structure were used to fabricate fiber reinforced plastic (FRP) composite by hand lay-up method. The investigation on tensile property was carried out on specimens in 7 orientations including 0 style="white-space:nowrap;">°/5 style="white-space:nowrap;">°/15 style="white-space:nowrap;">°/75 style="white-space:nowrap;">°/85 style="white-space:nowrap;">°/90 style="white-space:nowrap;">° in previous works. With the specimen parameters and experimental data, FEM model was built by the software of Marc. By combining the experimental results and finite element analysis, the modulus was simulated and calculated at the first stage. Then interfacial stress of the 0 degree and 90 degree was also calculated. By the initial fracture stress data from experiment as well as the simulation value of interfacial strength of 0 and 90 degree, the initial fracture stress of the off-axial specimens style="font-family:Verdana;">was style="font-family:Verdana;">calculated and predicted. The result shows that the interfacial strength of the glass fiber bundle is higher style="font-family:Verdana;">than style="font-family:Verdana;">that of the carbon fiber bundle in transverse direction. By using the interfacial strength and according to the Von Mises yielding criterion, the initial fracture stress was predicted, which can be a contribution to the design or predict of the material properties.
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