Influence of static mean stresses on the fatigue behavior of 2024 aluminum alloy under multiaxial loading

Abstract

Axial alternating stress controlled fatigue tests with superimposed static torsional mean stress and shear alternating fatigue tests with superimposed static tensile mean stress are represented. The material used in the current experimental investigation is 2024 aluminum alloy. A decrease in the fatigue life of the material was observed with an increase in the shear and static tensile stresses. Marin and modified Crossland methods are analyzed by means of the available experimental data. The two modifications of Sines method are proposed to take into account the static torsional stress effect (Sines+) and different slopes of the S-N curves in tension-compression and torsion tests (Sines++). It is shown that Sines++ model is the most accurate among others.

Mechanical properties of additively manufactured AlSi10Mg under quasi‐static and cyclic loading

“…Fatigue curves are often represented using the well‐known Basquin equations: σ a = σ′ f · (2 N ) b (refer to, e.g., previous papers 62–65 ). The equation can be employed to derive the Basquin parameters σ′ f and b .…”

“…Fatigue curves are often represented using the wellknown Basquin equations: σ a = σ 0 f Á(2N) b (refer to, e.g., previous papers [62][63][64][65] ). The equation can be employed to derive the Basquin parameters σ The comparison between the model predictions and the experimental results is visually presented in Figure 12, providing an insightful evaluation of the model's predictive accuracy when compared to experiments.…”

Influence of different loading paths on the multiaxial fatigue behavior of 2024 aluminum alloy under the same amplitude values of the second invariant of the stress deviator tensor

“…In pure torsion, the fracture is perpendicular to the rod axis (Fig. 2 d) In the article [37], the authors considered multiaxial fatigue models and compared them based on the results of biaxial nonproportional tests with a constant component of the shear and normal loading axes. Among the models, the most accurate is the modified Sines++ model.…”

“…In addition, it is also important to check the applicability of models for notched and cracked bodies. In previous work, the Marin, modified Crossland and Sines models were compared by using non-proportional fatigue test data (with superimposed static mean stress) of 2024 aluminum alloy [37]. As a result, it was shown that the modified Sines method described the experimental data in the most accurate way.…”

Analysis of multiaxial fatigue models based on the results of biaxial tests for aluminum alloys

“…Параметры нагружения (изменение соотношения амплитуд напряжений, сдвига фаз, соотношения частот нагружения, средних напряжений в цикле и т.д.) могут существенно влиять на усталость материала [11][12][13][14][15][16][17][18]. Для описания усталостного поведения используются различные модели многоосной усталости, которые можно разделить на три группы: основанные на напряжении, деформации и энергии [19].…”