Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Impact Fatigue Strength and Reliability for Fiber Reinforced Epoxy Resin Laminates Subjected to Repeated Impact Loads
Nagatoshi OKABEToshiyuki YANOIsao KAMATATadao MORI
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1982 Volume 31 Issue 351 Pages 1210-1216

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Abstract

The impact fatigue tests were conducted on several kinds of laminates such as non-woven polyester cloth or glass cloth reinforced epoxy resins. From the experiments, the properties of impact fatigue strength for these laminates were clarified, and the scatter properties of these strengths were statistically analyzed. The safety factor and the allowable stress for laminates under service impact loadings were studied on the basis of failure probability theory. The results were as follows:
(1) The fatigue strength (σt, τs) of the laminates subjected to repeated impact tensile or shear loads show the scatters of logarithmic distribution and can be estimated as the probability values by the following formula, respectively,
σtNfmt=Dtμsu, τsNfms=Dsμsu
where (mt, Dt), (ms, Ds) are the parameters of impact fatigue properties, Nf is the life to failure, (μ, s) are statistical values and u is the parameter of probability.
(2) Both strength constants (Dt, Ds) are closely related to the static monotonic strength (σB, τf) and can be estimated from these values.
(3) The safety factor and the allowable stress of these laminates under service impact loads can be determined according to the expectative failure probability. It is very useful for the fittest structural design.

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