27 research outputs found

    Study of gas-tungsten-arc welding power density Final report, 1 Jun. 1968 - 30 May 1969

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    Power density in gas tungsten arc welding with modified cathode

    Large-diameter carbon-composite monofilaments

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    Large-diameter carbon composite monofilaments with high strength and high modulus were produced by pregging multifiber carbon bundles with suitable organic resins and pyrolysing them together. Two approaches were developed to increase the utilization of fiber tensile strength by minimizing stress concentration defects induced by dissimilar shrinkage during pyrolysis. These were matrix modification to improve char yield and strain-to-failure and fiber-matrix copyrolysis to alleviate matrix cracking. Highest tensile strength and modulus were obtained by heat treatments to 2873 K to match fiber and matrix strain-to-failure and develop maximum monofilament tensile-strength and elastic modulus

    Comment on "Strength Predictions of Composite Laminates with Unloaded Fastener Holes"

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    Fracture Criterion for Notched Thin Composite Laminates

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