Conclusions
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1.
Examination of the fatigue of fiber glass plastic pipes in loading with the sinusoidal cycle can be replaced with an error of up to 10% by tests with the right-angled cycle in equipment of simple design.
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2.
The endurance limit in the right-angled cycle is lower than in the sinusoidal cycle. Therefore, in testing the pipes it is necessary to avoid sharp changes in internal pressure if the winding angle is αi> 15°.
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3.
The tangential stress corresponding (with an error of up to 15%) to the endurance limit in the right-angled load cycle can be determined on the basis of acoustic emission in static internal pressure loading.
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Translated from Mekhanika Kompozitnykh Materialov, No. 4, pp. 633–641, July–August, 1985.
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Nowak, M., Jerzyk, I. Effect of the characteristics of sinusoidal and rectangular cycles on the endurance limit of pipes of a laminated epoxy fiber glass plastic. Mech Compos Mater 21, 432–439 (1986). https://doi.org/10.1007/BF00610891
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DOI: https://doi.org/10.1007/BF00610891