Anisotropy in the quasi-static and cyclic behavior of ZK60 extrusion: Characterization and fatigue modeling

Pahlevanpour, Amirhossein; Karparvarfard, Seyyed Mohamad Hasan; Shaha, S.K.; Behravesh, Seyed Behzad; Adibnazari, Saeed; Jahed, Hamid

doi:10.1016/j.matdes.2018.10.026

Cited by 34 publications

(16 citation statements)

References 48 publications

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“…The yellow dotted line is used to separate the crack propagation area and the FF area. The size of the FCG area often represents the fatigue life of the specimen [ 18 , 29 ]. The FCG area of the 45° and RD specimens is similar, which is larger than that of the ED specimen.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic Low Cycle Behavior of the Extruded 7075 Al Alloy

Wang

Yang

et al. 2021

Materials

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The quasi-static and low cycle fatigue tests of extruded 7075 Al alloy (Φ200 mm) were investigated in three directions: the extrusion direction (ED), the radial direction (RD), and 45° with ED (45°). Grain morphology analysis, texture measurement, and fatigue fracture characterization were conducted to discuss the relationship between microstructure and mechanical properties. The experimental results showed that the ED specimen had higher ultimate tensile strength (UTS) and low cycle fatigue (LCF) properties, which were mainly attributed to the following three causes. First, the grain boundaries (GBs) had an obvious effect on the crack growth. The number of GBs in the three directions was different due to the shape of the grains elongated along the ED. Second, the sharp <111> texture and the small Schmidt factor along the ED explained the higher ultimate tensile strength (UTS) of the ED specimens. Third, fatigue fracture observation showed that the ED specimen had a narrow fatigue striation spacing, which indicated that the plastic deformation of the ED specimen was the smallest in each cycle. In addition, two fatigue prediction models were established to predict the LCF life of extruded 7075 Al alloy, based on the life response behavior of the three directions under different strains.

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Section: Resultsmentioning

confidence: 99%

Anisotropic Low Cycle Behavior of the Extruded 7075 Al Alloy

Wang

Yang

et al. 2021

Materials

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“…The uniaxial behavior of ZK60 extrusion had already been studied 25 . To perform quasi‐static tensile and axial cyclic tests after forging, smooth dog‐bone specimens were machined out of I‐beam flanges (Figure 1B).…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Such multiaxial study on ZK magnesium alloys is, however, very rare, despite their superb mechanical properties due to the presence of Zr as a grain refiner 23,24 . The mechanical behavior of ZK60 extrusion has been studied under uniaxial loading 25–29 . Recently, Albinmousa et al 30 investigated the multiaxial behavior of ZK60‐T5 extrusion and reported similar fatigue lives under proportional and non‐proportional multi‐axial fatigue load paths for heat‐treated ZK60 Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Karparvarfard

Roostaei

Behravesh

et al. 2022

Fatigue Fract Eng Mat Struct

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Uniaxial and multiaxial fatigue characteristics of as-extruded and extrudedthen-forged ZK60 magnesium alloys were examined to understand the influence of low-temperature forging on its deformation mechanics. Upon forging, basal texture weakening and grain refinement occurred in ZK60 extrusion. Based on uniaxial results, forging process led to improvements in quasi-static tensile strength and axial cyclic response in high-cycle fatigue regime, whereas shear responses remained unaffected. Biaxial non-proportional tests demonstrated that changing phase angle shift between axial and torsional waveforms had no effect on cyclic axial response, contrary to the shear response. Lastly, critical-plane and energy-based life prediction models were assessed.

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“…Sometimes, anisotropy may arise as a result of the material forming processes. For example, magnesium alloys exhibit material anisotropy as they are formed under rolling and extrusion [1, 2]. In other cases, there is a need for controlled anisotropy, dependent on specific applications, such as biological implants used in dentistry.…”

Section: Introductionmentioning

confidence: 99%

Partial slip contact analysis for a monoclinic half plane

Çömez

Alinia

Güler

et al. 2020

Mathematics and Mechanics of Solids

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In this paper, the nonlinear partial slip contact problem between a monoclinic half plane and a rigid punch of an arbitrary profile subjected to a normal load is considered. Applying Fourier integral transform and the appropriate boundary conditions, the mixed-boundary value problem is reduced to a set of two coupled singular integral equations, with the unknowns being the contact stresses under the punch in addition to the stick zone size. The Gauss–Chebyshev discretization method is used to convert the singular integral equations into a set of nonlinear algebraic equations, which are solved with a suitable iterative algorithm to yield the lengths of the stick zone in addition to the contact pressures. Following a validation section, an extensive parametric study is performed to illustrate the effects of material anisotropy on the contact stresses and length of the stick zone for typical monoclinic fibrous composite materials.

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Anisotropy in the quasi-static and cyclic behavior of ZK60 extrusion: Characterization and fatigue modeling

Cited by 34 publications

References 48 publications

Anisotropic Low Cycle Behavior of the Extruded 7075 Al Alloy

Anisotropic Low Cycle Behavior of the Extruded 7075 Al Alloy

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Partial slip contact analysis for a monoclinic half plane

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