Abstract
The influence of notches on static tensile strength was studied for a composite material. Tension tests of notched plate for glass cloth/epoxy laminates have been carried out for a wide range of notch tip radii. All notched specimens failed in a brittle manner through the formation of small deformation near the notch tip. The experiment shows that the nominal stress at failure decreases with decreasing notch tip radius and it approaches a constant value when the notch tip radius is less than about 0.2mm. It has been verified that the maximum elastic stress at the notch tip when the specimen fails is governed by notch tip radius alone, and is independent of notch depth. On the basis of the concept of linear notch mechanics, the experimental results mentioned above can be clearly explained, and the limiting condition for the fracture of notched plates of composite materials is expressed. The condition is the as same as what is expressed in the case of a notched solid polymer.
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