BS in Materials Engineering
Materials Engineering Department
A testing protocol was established for measuring the flexure properties of thin-walled tubes constructed of a composite mixture of glass and carbon fibers and epoxy resin for use in Fly Fishing rods. Standard three point bend tests were conducted in accordance with ASTM standard D7329-13 with a span length of six inches. All samples were of the sample length and diameter, allowing direct comparison of the maximum loads reached before failure, which are directly indicative of the Modulus of Rupture (MOR). Two constructions were tested both containing the same unidirectional fiber but with different support structure. These tubes were tested identically for both as delivered samples and for the samples having undergone ultraviolet, humidity, and elevated temperature exposure. Construction 1 reached higher maximum stresses than Construction 2 and displayed similar amounts of flexure. When coated and exposed, the strength of Construction 1 and 2 both increased when compared to uncoated and unexposed samples. In Construction 1, maximum loads achieved in samples painted, clear coated and exposed averaged loads at failure of 45.33lb, solely clear coated and exposed samples averaged 42.9lb at failure, uncoated and exposed averaged 38.1lb, and uncoated and unexposed averaged 40.9lb. In Construction 2, the differences were less pronounced. Painted, clear coated, and exposed averaged 39.6lb at failure, clear coated and exposed averaged 38.0lb, uncoated and exposed averaged 36.2lb, and uncoated, unexposed averaged 36.6lb. To ensure population differences,statistical evaluation was done at a 95% confidence interval.
Available for download on Wednesday, June 10, 2020