P3.13. The interfacial shear strength of a fiber-matrix joint is often measured by a pullout test. This involves pulling a fiber bundle out of a resin disk cast around a small length of the bundle. A typical load displacement curve obtained in a pullout test is shown. 1. Calculate the average interfacial shear strength of the joint 2. What must the maximum thickness of the resin disk be so that the fiber bundle pulls out before it breaks within the disk? Pmax Load (P) Displacement sin di Fiber bundle

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P3.13. The interfacial shear strength of a fiber-matrix joint is often measured by a pullout test. This involves pulling a fiber bundle out of a resin disk cast around a small length of the bundle. A typical load displacement curve obtained in a pullout test is shown. 1. Calculate the average interfacial shear strength of the joint 2. What must the maximum thickness of the resin disk be so that the fiber bundle pulls out before it breaks within the disk? Pmax Load (P) Displacement sin di Fiber bundle

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