Standard Practice for Strain-Controlled Axial-Torsional Fatigue Testing with Thin-Walled Tubular Specimens

Importancia y uso:

4.1 Multiaxial forces often tend to introduce deformation and damage mechanisms that are unique and quite different from those induced under a simple uniaxial loading condition. Since most engineering components are subjected to cyclic multiaxial forces it is necessary to characterize the deformation and fatigue behaviors of materials in this mode. Such a characterization enables reliable prediction of the fatigue lives of many engineering components. Axial-torsional loading is one of several possible types of multiaxial force systems and is essentially a biaxial type of loading. Thin-walled tubular specimens subjected to axial-torsional loading can be used to explore behavior of materials in two of the four quadrants in principal stress or strain spaces. Axial-torsional loading is more convenient than in-plane biaxial loading because the stress state in the thin-walled tubular specimens is constant over the entire test section and is well-known. This practice is useful for generating fatigue life and cyclic deformation data on homogeneous materials under axial, torsional, and combined in- and out-of-phase axial-torsional loading conditions.

Subcomité:

E08.05

Referida por:

E3414-23, F2902-16E01, E1823-24C

Volúmen:

03.01

Número ICS:

19.060 (Mechanical testing)

Palabras clave:

axial strain; axial stress; axial-torsional fatigue; in-phase axial-torsional fatigue test; out-of-phase axial-torsional fatigue test; shear strain; shear stress; strain-controlled testing; thin-walled tubular test specimen;