The use of an hourglass tubular sample to determine the mechanical properties of construction materials
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hourglass mini-sample
mechanical properties
input signal
material fatigue


The paper presents the results of static and fatigue tests from tests carried out on P91 steel with the use of a thin-walled tubular hourglass mini-sample. The tensile and torsion characteristics of the tested material and the mechanical parameters determined on their basis are presented. The paper presents the influence of the type of testing machine control (displacement, strain or stress signal) on the behavior of the material in the form of its responses illustrating changes in the amplitude of stress, strain and hysteresis loop. The differences in the lines of limited fatigue strength, resulting from the application of the load in the form of cyclically changing strain and stress, are presented.

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