PLoS ONE 16(6):Įditor: Jianguo Wang, China University of Mining and Technology, CHINA The maximum error is 15.65%, indicating that the formula established is reasonable and effective.Ĭitation: Yang Y, Chen H, Feng W, Xu S, Li Y, Zhang R (2021) Fatigue life analysis for 6061-T6 aluminum alloy based on surface roughness. The relationship between surface roughness and fatigue life is established and the calculated value of the fatigue life is compared with the test results. Experiment of surface roughness verified the correctness of the model. Then the extraction method of surface curve is proposed to effectively represent the real surface roughness through 3D model reconstruction.
Surface topography was simplified into a series of elliptic micro notches, and empirical formula for stress concentration factor is established based on simulation work. The effect of surface roughness on the fatigue life of 6061-T6 aluminum alloy is studied to analyze the fatigue life by surface roughness parameters. Considering the complexity of surface condition, a relatively efficient and economic approach based on surface reconstruction and interpolation method was proposed. For practical engineering design, recommended reduced values of shear strength and high-triaxiality tensile strength of AA 6061-T6 extrusions are given.Surface condition is one of the dominant factors affecting fatigue life. It is found that both the overall nominal stress-strain curves and fracture patterns for all specimens are well predicted by the material models.
The material models of plasticity and fracture are numerically implemented into FE code ABAQUS/explicit by the material subroutine VUMAT.
Regarding the ductile fracture, modified Mohr-Coulomb fracture model with damage-induced softening is adopted to predict crack initiation and propagation under different stress states. To fully describe these experimental observations, a new plastic model considering the pressure dependence, Lode angle effect, and hardening with post-necking correction is proposed. In addition, true stress-true strain data obtained from tensile coupon tests overestimate the hardening behavior at large deformation.
The yield stress under plane strain or pure shear is lower than that under axisymmetric tension. It is observed that the yield stress decreases as the notch or groove radius decreases. Experiments on smooth and notched round bars, grooved plates and shear plates are conducted. This paper focuses on the plastic and fracture behaviors of AA 6061-T6 extrusions over a wide range of stress states. However, researches on behaviors of the aluminum alloy under large deformation and fracture by means of meso-mechanics are still insufficient. Aluminum alloy 6061-T6 (AA 6061-T6) extrusions have been widely applied in large-span reticulated shells.