The notch sensitivity of boron film (B/PI) reinforced graphite fiber composites was compared to the behavior of fiber-only material by means of uniaxial tests on tensile coupons with two sizes of holes (.052 and .104 in.) drilled at midgage length, and on undrilled control coupons. The re sults indicated that B/PI additions to graphite fiber laminates reduced the notch sensitivity, while at the same time substantially raising both the tensile strength and the work-to-fracture of the material.
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