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A proposal of modification of the zenner's fatigue criterion for the case of non-proportional loading

100%

Pejkowski Ł. , Skibicki D.

tom Vol. 7, no 3

217-224

In this paper, a modification of the Zenner’s fatigue criterion has been proposed. The modification changes the value of “effective shear stress” amplitude for the case of non-proportional load. In this work there’s also verification of proposed modification has been made for 4 kinds of materials. In the conclusions, distinctive features of results obtained by using these methods have been pointed out.

Analysis of accelerated methods for determination of fatigue curve

100%

Pejkowski Ł. , Skibicki D.

tom Vol. 6, no 3

199-214

Specification of a full fatigue characteristic for a material and its structure elements takes a very long time and generates significant costs. There are many methods for accelerated obtainment of fatigue characteristics. In this work, a comparative analysis of selected methods of fatigue life specification for 12 kinds of materials has been made, on the basis of literature study. In the conclusions, distinctive features of results obtained by using these methods have been pointed out.