Abstract
The relationship between J-integral and crack tip opening displacement of composite materials is studied. The plastic constraint factor and the plastic flow stress are discussed macroscopically. It is found that when the kind of matrix resin and the void content are same and the fiber content is changed, J* is proportional to CTOD* on FRPC, RIM and R-RIM materials. It is concluded that the plastic constrain factors of FRPC are from 1.4 to 1.3, when the plastic flow stress is a stress at elastic limit, and the factors of RIM and R-RIM polyurethane are from 1.5 to 1.4, when the flow stress is one half of the sum of a stress at elastic limit and the tensile strength.
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