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Programmable Tests of Fatigue Life for D16CzATW Aluminum Alloy

Ligaj B.

Machine Dynamics Research

2015

Vol. 39, No. 2

61-69

This article presents the results of fatigue tests of D16CzATW under the following loadings: constant amplitude loading (R=-1), service loading and programmable loading. Experimental tests were conducted with the use of standard Falstaff no. 130 loading, which provided the basis for construction of a two-parameter load spectrum in the form of a correlation table. A loading program with random sequence of cycles was created with the use of the spectrum. The results of experimental fatigue tests for programmable loadings lie on the safe side of the fatigue life diagram for service loadings.

A fatigue life calculation method for structural elements made of D16CzATW aluminium alloy

Szala J., Szala G.

Polish Maritime Research

2010

nr 3

8-17

In the calculating of fatigue life of structural elements the methods based on hypotheses of fatigue damage summation are commonly applied. In using the methods, apart from choice of an appropriate hypothesis, it is necessary to know a loading spectrum which usually constitutes a set of sinusoidal cycles of variable parameters (Sa, Sm), as well as fatigue characteristics in the form of Wöhler fatigue diagram, as a rule. Knowledge of the above mentioned data is low during structural design process as designed material objects and possibility of performing measurements are lacking. Hence in this work a calculation method of fatigue life of structural elements, based on the relations between fatigue life diagrams determined in constant-amplitude conditions (Wöhler diagrams) and those obtained under programmed or random loads, is described. The proposed method was experimentally verified by using results of fatigue tests on structural elements made of D16CzATW aluminium alloy.