Through-the-Thickness Tensile Strength of Fiber-Reinforced Plastics

TL;DRAbstract

The through-the-thickness tensile strength of fiber-reinforced plastics is difficult to measure, but for some purposes it is a significant design property. This property appears to be critically dependent on the test method and specimen preparation. The authors have examined the possibility of producing tensile failures in a disk subjected to diametral compression, a method well known in the field of testing of brittle isotropic materials. In the isotropic case there is a uniform tensile stress distribution perpendicular to the diameter which is the axis of compression. Slices of round pultruded rod are transversely isotropic, and the method of test gives convenient and consistent results. Results are also presented for the through-the-thickness strength of laminated materials. The disks were prepared by turning a cylindrical bar from a piece of thick laminate. Stress distributions have been analyzed by finite element analysis and compared with published theory. Both methods have been

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