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.

Statistical Correlation Between the Thermal Transition Stress of a Specimen and its Resistance to Alternating Torsional Fatigue

1983 ◽  
Vol 105 (2) ◽  
pp. 200-205
Author(s):  
R. Harry ◽  
F. Bastenaire ◽  
F. Joubert ◽  
L. Regnier
Keyword(s):  
Nondestructive Test ◽  
Statistical Study ◽  
Endurance Limit ◽  
Close Correlation ◽  
Statistical Correlation ◽  
The Other ◽  
Thermal Transition ◽  
Transition Stress ◽  
Torsional Fatigue ◽  
The One

The conventional difficulty encountered in fatigue studies is the impossibility of performing more than one fatigue test on a specimen. The purpose of this paper is to present a statistical study in order to: 1) confirm the close correlation between the transition stress determined for each specimen following a rapid thermal nondestructive test and on the one hand, the lifetime N, when subjected to a fatigue treatment at a given level τ, in the elastic area; and on the other hand, the actual endurance limit specific to the specimen; and 2) provide an evaluation of the results obtained.

scholarly journals Determine the Compressive Strength of Calcium Silicate Bricks by Combined Nondestructive Method

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Jiri Brozovsky
Keyword(s):  
Compressive Strength ◽  
Calcium Silicate ◽  
Pulse Method ◽  
Close Correlation ◽  
Ultrasonic Pulse ◽  
Nondestructive Method ◽  
Production Plant ◽  
Rebound Hammer ◽  
Schmidt Rebound Hammer

The paper deals with the application of combined nondestructive method for assessment of compressive strength of calcium silicate bricks. In this case, it is a combination of the rebound hammer method and ultrasonic pulse method. Calibration relationships for determining compressive strength of calcium silicate bricks obtained from nondestructive parameter testing for the combined method as well as for the L-type Schmidt rebound hammer and ultrasonic pulse method are quoted here. Calibration relationships are known for their close correlation and are applicable in practice. The highest correlation between parameters from nondestructive measurement and predicted compressive strength is obtained using the SonReb combined nondestructive method. Combined nondestructive SonReb method was proved applicable for determination of compressive strength of calcium silicate bricks at checking tests in a production plant and for evaluation of bricks built in existing masonry structures.

Accelerated Locati method for testing machine parts for fatigue resistance

2021 ◽  
pp. 28-30
Author(s):  
Keyword(s):  
Fatigue Resistance ◽  
Inflection Point ◽  
Endurance Limit ◽  
Testing Machine ◽  
Fatigue Curve ◽  
Test Method ◽  
Accelerated Tests ◽  
Machine Parts ◽  
Standard Tests

The results of testing specimens and machine parts for fatigue resistance according to the standard method with the construction of the Wöhler curve and the determination of the endurance limit and the accelerated method with the determination of the endurance limit are presented. As an accelerated test method, the method of step-increasing loads (the Locati method) was used, as the conditional fatigue curves — oblique fatigue curves parallel to the oblique fatigue curves obtained during standard tests of specimens with the construction of the Wöhler curve. For all conventional curves, the same inflection point of the fatigue curve in semilogarithmic coordinates was taken. Keywords: fatigue resistance, endurance limit, Wöhler curve, accelerated tests. [email protected]

Tire Treadwear — A Comprehensive Evaluation of the Factors: Generic Type, Aspect Ratio, Tread Pattern, and Tread Composition Part I: Introduction and Details on the Organization of the Program

1986 ◽  
Vol 14 (4) ◽  
pp. 201-218 ◽  
Author(s):  
A. G. Veith
Keyword(s):  
Aspect Ratio ◽  
Comprehensive Evaluation ◽  
Test Method ◽  
Interactive Effects ◽  
Data Analyses ◽  
Main Effect ◽  
Systematic Determination ◽  
Relationship Of ◽  
The Relationship

Abstract This four-part series of papers addresses the problem of systematic determination of the influence of several tire factors on tire treadwear. Both the main effect of each factor and some of their interactive effects are included. The program was also structured to evaluate the influence of some external-to-tire conditions on the relationship of tire factors to treadwear. Part I describes the experimental design used to evaluate the effects on treadwear of generic tire type, aspect ratio, tread pattern (groove or void level), type of pattern (straight rib or block), and tread compound. Construction procedures and precautions used to obtain a valid and functional test method are included. Two guiding principles to be used in the data analyses of Parts II and III are discussed. These are the fractional groove and void concept, to characterize tread pattern geometry, and a demonstration of the equivalence of wear rate for identical compounds on whole tread or multi-section tread tires.

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