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Об определении коэффициента запаса по усталостной прочности при регулярном нагружении

Об определении коэффициента запаса по усталостной прочности при регулярном нагружении

Abstract

Расчеты на выносливость определяют срок службы машин, конструкций и их элементов. Традиционные методы основаны на использовании элементарных формул и различных экспериментально полученных коэффициентов. В работе предложен способ расчета на выносливость по значениям вычисленных напряжений в зоне концентратора, полученный преобразованием классических формул. Показано, что при расчетах на выносливость в случае неодноосного напряженного состояния нецелесообразно приводить напряжения цикла к эквивалентному напряжению и по нему определять амплитудное и среднее эквивалентные напряжения. Необходимо сначала определить амплитудные и средние напряжения, а затем по ним вычислять значения эквивалентного амплитудного и эквивалентного среднего напряжений. На примере доказана эффективность применения этого способа. Предложенный способ расчета на выносливость может быть использован при расчетах на выносливость, как для одноосного, так и для многоосного напряженного состояния.

A method for calculating endurance in terms of stresses in concentration areas is presented. The method is based on the transformation of classical formulas. It is shown that the endurance in the case of a non-uniaxial stress state is not practical to determine in terms of cycle stresses reduced to an equivalent stress that can be used to calculate the amplitude and average equivalent stresses. It is suggested that the amplitude and average stresses should be determined first in order to calculate the values of equivalent amplitude and average stresses afterwards. The efficiency of the method is proved by an example. The method can be used for calculating the endurance both in the case of uniaxial and multiaxial stress states.

Keywords

ВЫНОСЛИВОСТЬ, ОДНООСНОЕ И МНОГООСНОЕ НАПРЯЖЕННОЕ СОСТОЯНИЕ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze