SU1265533A1 - Method for cyclic strength test of materials - Google Patents

Abstract

The invention relates to a testing technique and can be used in testing materials for cyclic strength at constant vibration velocity in the mode of random external influences around the average frequency f. In order to reduce the test time, the natural frequencies f of one sample are preliminarily determined, where 1 1,2,3, ... N, and f, f., F., And load this sample in the medium frequency range from f ,. , & w with a belt width af of the frequency spectrum to determine the value of 1, Q S corresponding to the minimum medium (L is the voltage, and cyclic loading is carried out before failure at the width of the frequency spectrum I l.

Description

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Claims (1)

Claim A method of testing materials for cyclic strength under accidental loading, according to which samples of the material are cyclically loaded 30 to failure at constant vibration speed and form a broadband spectrum of external influences with an average frequency ί, the number of loading cycles to failure at various given average stresses is recorded and judged by them on the fatigue strength of the material, characterized in that, in order to reduce testing time, 40 previously determined for the same sample eigenfrequencies Ko ³ le REPRESENTATIONS sample gdeil = 1,2,3 ,. .. N, a? _Kl > f ^ £. _l1 , and load the sample in the mid-range οτ £ _Ν _ ₍ 45 to £ _ν with a variable width Λ f _{m of the} spectrum until the value b определения is determined that corresponds to the minimum average voltage, and cyclic loading of the samples to failure is carried out at a frequency spectrum width