Accelerated determination of the endurance limit of materials

1972 ◽  
Vol 4 (6) ◽  
pp. 767-769 ◽  
Author(s):  
I. M. Vasinyuk ◽  
V. A. Samgin
Keyword(s):  
Endurance Limit

Determination of Parameters of Endurance Limit Distribution Law of Material by the Methods of Nonparametric Statistics and Kinetic Theory of High-Cycle Fatigue

2017 ◽  
Vol 736 ◽  
pp. 52-57 ◽  
Author(s):  
Ksenia Syzrantseva ◽  
Vladimir Syzrantsev
Keyword(s):  
Kinetic Theory ◽  
Distribution Density ◽  
Endurance Limit ◽  
Nonparametric Statistics ◽  
Fatigue Tests ◽  
Distribution Law ◽  
Distribution Density Function ◽  
Life Tests ◽  
Determination Of Parameters

The paper considers the first developed algorithm of processing the data of specimen life tests based on the kinetic theory of mechanical fatigue and methods of nonparametric statistics. It makes it possible to determine the distribution density function of the material endurance limit. Implementation of the algorithm is illustrated on example of processing the data obtained in fatigue tests of steel 50 specimens.

A Statistical Appraisal of the Prot Method for Determination of Fatigue Endurance Limit

1957 ◽  
Vol 24 (2) ◽  
pp. 214-218
Author(s):  
W. A. Hijab
Keyword(s):  
Statistical Analysis ◽  
General Formula ◽  
Endurance Limit ◽  
Statistical Efficiency ◽  
Great Saving ◽  
Secondary Result ◽  
Fatigue Endurance

Abstract A statistical analysis of the precision of the estimate of endurance limit as determined by the Prot method is carried out. This analysis shows that the Prot method cannot achieve a great saving in the number of specimens required, for its statistical efficiency is found to be even less than that of its other two competitors, the probit and staircase methods. This fact, coupled with serious objections to its assumptions, renders its usefulness highly questionable. A secondary result of the analysis is that the optimum efficiency of the Prot method is achieved when only two rates of increase of stress, as widely separated as possible, are used. A derivation of a general formula, of which the Prot method is a particular case and which makes explicit all assumptions necessary for the valid derivation of the Prot method, is also given.

Measuring the Actual Endurance Limit of One Specimen Using a Nondestructive Method

1981 ◽  
Vol 103 (1) ◽  
pp. 71-76 ◽  
Author(s):  
R. Harry ◽  
F. Joubert ◽  
A. Gomaa
Keyword(s):  
Fatigue Life ◽  
Present State ◽  
Endurance Limit ◽  
Thermal Response ◽  
Close Correlation ◽  
Nondestructive Method ◽  
Test Method ◽  
Transition Stress ◽  
Thermal Test

The conventional endurance limit does not characterize one specimen but a set of virgin specimens. This present study deals with the determination of the present state of one specimen by its “actual” endurance limit. The connection between the state of a specimen and its thermal response, obtained by using the thermal test method, has already been shown. It is shown here the close correlation which exists between the transition stress value τl and the actual endurance limit of the specimen. Thus, the actual endurance limit of a specimen at any moment in its fatigue life, so, at any stage of treatment, could be determined by using a “nondamaging” method.

scholarly journals A SINGLE-BAMPLE METHOD FOR ESTIMATING RESISTANCE OF PARTS

2018 ◽  
pp. 111-120
Author(s):  
A.G. Kibakov ◽  
Yu.M. Khomyak
Keyword(s):  
Fatigue Resistance ◽  
Endurance Limit ◽  
Fatigue Curve ◽  
Individual Characteristics ◽  
Fractographic Analysis ◽  
Approximate Estimate ◽  
The Individual ◽  
Weibull Equation

The determination of the individual characteristics of the fatigue resistance of the objects is proposed using fractographic analysis of their fractures, which gives an approximate estimate of the voltage corres-ponding to one cycle and allows one to construct an oblique portion of the fatigue curve from the test of one object and calculate the endurance limit from the Weibull equation.

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