Development of ASTM for testing composite tube samples

Abstract

Fender systems are important in the protection of both vessels and bridge piers during potential vessel collisions. Bridge fenders absorb the large quantities of energy released during these impacts. The marine environment surrounding fender systems are not suitable for material susceptible to corrosion or degradation, such as steel, reinforced concrete, or timber. Composite materials are best suited for marine environments, and capable of absorbing large amounts of energy. This has led to fender systems that are designed using composite tubes. One major concern in the design of composite fenders is the absence of a standardized material property test. Because composite properties are orthotropic, traditional coupon testing does not yield correct material properties. In order to determine the material properties, a full-scale destructive test would be required. Although this is possible, it is costly, time consuming, and must be completed in a specialized laboratory. The completed research focused on developing a small-scale standardized test using machines readily available to most laboratories and construction companies. A small specimen in the form of an arc was taken and tested in flexure using a developed apparatus. An equation was generated to model the behavior of the material when loaded. The test and equation allowed for determination of the modulus and ultimate strength of composite samples.