Cyclic stress-strain behavior and low-cycle fatigue of Ti 6-4 at 260 degrees centigrade

Article Abstract:

The cyclic stress-strain and fatigue crack growth behavior of titanium alloy Ti 6-4 at a temperature level of 260 degrees centigrade is studied. Experiments are conducted in a servo-hydraulic testing machine wherein specially prepared Ti 6-4 specimens are heated using an electrical resistance convention furnace. The stress-strain and tensile measurements are then obtained by means of a series-connected load cell. Results show that the specimens' tensile properties are not affected by the fatigue cycling process.

Titanium alloys

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Multiaxial fatigue under variable amplitude loads

Article Abstract:

Kandil et al.'s parameter was used to investigate multiaxial fatigue under variable amplitude loading. The parameter involved rainflow cycle counting on the shear strain history and the Minerva Palmgren damage rule. Proportional and nonproportional tension-torsion loading were obtained from fatigue data of tubular specimens of S45C steel. The results showed that both maximum shear strain range and maximum damage approaches yielded acceptable fatigue lives irrespective of the damage computation method.

Steel, Steel bars, Steel bar

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Significance of the relative orientation of the mean and alternating principal stress axes in biaxial fatigue

Article Abstract:

The importance of the relative orientation of the mean and alternating principal stress axes in the analysis of biaxial fatigues in materials is evaluated. A simple case study is conducted wherein the relation between a material's fatigue behavior and stress axes under varying axial load conditions are investigated. Results show that extensive studies are still needed to formulate an effective technique for the analysis of biaxial fatigue.

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