Multiaxial fatigue of extruded AZ61A magnesium alloy

Multiaxial effects on LCF behaviour and fatigue failure of AZ31B magnesium extrusion

“…The cyclic shear behaviour of AZ31B extrusion was also found to be symmetric. Yu et al [26] investigated multiaxial behaviour of AZ61A extrusion under strain-controlled axial-torsional loading condition. The authors defined equivalent strain amplitude as the radius of the minimum circle circumscribing the loading path shown in the e À ffiffiffi 3 p =c strain space.…”

“…Later, Xiong et al [33] investigated multiaxial fatigue behaviour of AZ31B extrusion. Using this equivalent strain by Yu et al [26] they compared fatigue lives for different multiaxial loading paths and found that 90°out of phase loading is the most detrimental. They were able to predict multiaxial fatigue lives using modified Smith-Watson-Topper [28][29][30] and Jiang's models [27].…”

“…Critical plane models became popular in recent years because of their success in predicting fatigue life for various engineering materials and under different loading conditions. Models such as Fatemi-Socie [31], Smith-Watson-Topper [28,29] and Jiang [27] have been used to analyse various multiaxial loading paths, different materials on both specimen's and component's levels [25,26,32,[45][46][47][48][49][50]. However, there are studies indicating that the predictions of cracking orientations may not necessarily be in agreement with the critical plane predicted by the models even though fatigue predictions are considered reasonable, generally between ±2Â scatter bands.…”

A phenomenological stress–strain model for wrought magnesium alloys under elastoplastic strain-controlled variable amplitude loading

“…Extruded ME21 sheet metal is used solely in Section 4.2.4. To evaluate the proposed phenomenological model on other wrought magnesium semifinished products such as extruded rods or tubes, the raw data of Xiong et al [49] and Li et al [50] were used in Section 4.2.4: extruded AZ31B in the form of solid rods [49] and extruded AZ61A in the form of tubes [50]. At all four alloys, only results of tests with loading direction parallel to the rolling or extrusion direction were considered.…”

“…At all four alloys, only results of tests with loading direction parallel to the rolling or extrusion direction were considered. Refer to [23,30,49,50] for more information about the quasi-static and cyclic properties of the used alloys.…”