Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: magnesium alloy sheet

Sortuj według:

Ogranicz wyniki do:

Influences of stress states and loading directions on the anisotropic fracture of magnesium alloy AZ31B sheet under tension-dominated forming conditions

Qian Lingyun, Xu Sinuo, Li Heng, Zhou Yuwei, Sun Chaoyang, Ma Tengyun

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e213, 2022

The crystallographic textures of metal sheet induced by the rolling process cause its anisotropic fracture behavior via plasticity anisotropy. This research aimed to characterize the anisotropic fracture behavior of magnesium alloy AZ31B sheet during the conventional tension-dominated forming conditions. Four specimens with different shapes were designed to cover diverse stress states, and were respectively tension-tested to fracture along the rolling direction (RD), diagonal direction (DD), and transverse direction (TD) of rolled sheet. Almost all specimens failed in the shear fracture mode with slight necking localization. The distinct differences among load response, strain distribution as well fracture strain for three directions revealed the severe anisotropic fracture characteristic. To characterize the fracture anisotropy, the isotropic modified Mohr–Coulomb (MMC) fracture criterion was revised into an anisotropic one by considering the effect of loading direction. The updated unified fracture model together with the Yld2000-3d anisotropic yield function had better performances in describing load responses of tension tests for scaled modified compact-tension (SMCT) specimens under three loading directions, especially blindly predicting their crack locations. Three SMCT specimens all failed due to the tension-dominated stress state with the stress triaxiality higher than 1/3. As a comparison, the isotropic MMC model separately calibrated by tests along the RD, DD, and TD can only predict the fracture behavior of SMCT specimen in the corresponding loading direction, but it failed to judge the fracture features of other two directions.

Finite element analysis of elliptic cup deep drawing of magnesium alloy sheet

Yang T. S.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 27, nr 2

139-142

Purpose: In magnesium alloy sheet products have been attracting more and more attention in recent years because of their application potentials as coverings of portable electrical devices and automotive panels. Thus this paper focus on the deep drawing process of magnesium alloy sheet. Design/methodology/approach: The FEM soft ware DEFORM-3D is used to investigate the mateial flow character during the elliptic cup deep drawing of magnesium alloy sheet at elevated temperatures. Findings: Investigate the effective stress and forming load under various process parameter conditions, including the profile radius of die, the clearance between die cavity and punch, the blank holding force and working temperature during the elliptic cup deep drawing of magnesium AZ31 alloy sheet. Research limitations/implications: The initial blank's shape design and forming limit analysis of the elliptic cup deep drawing of magnesium AZ31 alloy sheet will be continued for future research. Originality/value: The original value of this paper is the finite element method is used to investigate the material flow character, forming load, stress and strain distribution during the the elliptic cup deep drawing of magnesium alloy sheet at elevated temperatures.