Flexural fatigue characteristics of two different types of glass fiber/epoxy polymeric composite laminates with statistical analysis

作者：Selmy A I^*; Azab N A; Abd El baky M A

来源：Composites Part B: Engineering , 2013, 45(1): 518-527.

DOI：10.1016/j.compositesb.2012.08.017

• Glass fibers laminates
• Fatigue strength
• Statistical analysis
• Lay-up

Flexural fatigue tests have been conducted on unidirectional glass fiber/epoxy, [U](5) and random glass fiber/epoxy, [R](5) composite laminates with a constant fiber volume fraction (V-f) = 37% and average thickness = 5.5 +/- 0.2 mm. The laminates were manufactured using hand lay-up technique. Flexural fatigue tests were performed on standard specimens at zero mean stress, i.e. a cyclic stress ratio = S-min/S-max = -1. A 20% reduction of the initial flexural stiffness was taken as a failure criterion. The specimens' surface temperature increase was investigated. To construct the S-N curve for each composite type, four stress levels have been considered using five specimens for each one. The failure modes of the test specimens were investigated. Two-parameter Weibull distribution function was used to analysis statistically the fatigue life results. Also, it has been employed to incorporate failure probability into S-N relationships.

• 出版日期2013-2