Study on Anisotropic Mechanical Behavior at near Pre-Crack for AZ31B Sheet under Biaxial Stress


Article Preview

In this study, a biaxial tensile test of cruciform specimens containing centre notch was conducted in order to clarify the deformation behavior near the crack tip at the early stages of crack initiation when objected to a biaxial stress state. Results show that the hardness and stress value within the deformed zone increased with increase in the loading ratio. Observation of the microstructure reveals that the deformation is dominated by basal slip under equal biaxial tensile loading. The asymmetrical biaxial tensile loading generates deformation twins near the crack tip. These results indicate that existing deformation twins contribute to higher hardness, and there is obvious anisotropism in the vicinity of crack tip under asymmetrical biaxial tensile loading.



Edited by:

Shijie Zhu, Baorong Ni and Dongying Ju






J. G. Wang et al., "Study on Anisotropic Mechanical Behavior at near Pre-Crack for AZ31B Sheet under Biaxial Stress", Materials Science Forum, Vol. 750, pp. 196-199, 2013

Online since:

March 2013




[1] H. Somekawa, A. Singh, T. Mukai, High fracture toughness of extruded Mg-Zn-Y alloy by the synergistic effect of grain refinement and dispersion of quasicrystalline phase, Scripta Mater. 56 (2007) 1091-1094.

DOI: 10.1016/j.scriptamat.2007.02.024

[2] H. Yoshinaga, R. Horiuchi, On the flow stress of α solid solution mg-li alloy single crystals, Mater. Trans. JIM. 4 (1963) 134-141.

DOI: 10.2320/matertrans1960.4.134

[3] W.F. Sheerly, R.R. Nash, Mechanical properties of magnesium monocrystals, Trans. Metall. Soc. AIME. 218 (1960) 416-423.

[4] J. Koike, Enhanced deformation mechanisms by anisotropic plasticity in polycrystalline Mg alloys at room temperature, Metall. Mater. Tran. s A. 36 (2005) 1689-1696.

DOI: 10.1007/s11661-005-0032-4

[5] M.R. Barnett, Twinning and the ductility of magnesium alloys: Part II. Contraction, twins, Mater. Sc. i Eng A. 464(2007) 8-16.

[6] H. Somekawa, A. Singh, T. Mukai, Fracture mechanism of a coarse-grained magnesium alloy during fracture toughness testing, Philos. Mag. Lett. 89 (2009) 2-10.

DOI: 10.1080/09500830802537718

[7] J.G. Wang, H.Y. Zhao, D.Y. Ju, Evaluation of stress intensity factors of thin AZ31B magnesium alloy plate under biaxial tensile loading, Trans. Nonferrous Met. Soc. China. 20 (2010) 1282-1287.

DOI: 10.1016/s1003-6326(09)60291-0

[8] M. Tsushida, K. Shikada, H. Kitahara, S. Ando, H. Tonda, Relationship between fatigue strength and grain size in az31 magnesium alloys, Mater. Trans. 49 (2008) 1157-1161.

DOI: 10.2320/matertrans.mc2007101

[9] J.G. Wang, D. Y Ju, M.J. Sun, S.L. Li, A new analytical method for stress intensity factors based on in situ measurement of crack deformation under biaxial tension, Materials and Design. 32 (2011) 664-670.

DOI: 10.1016/j.matdes.2010.08.005

[10] C.T. Sun, J. Tao, A.S. Kaddour, The prediction of failure envelopes and stress/strain behavior of composite laminates: comparison with experimental results, Compos. Sci. Technol. 62 (2002) 1673-1682.

DOI: 10.1016/s0266-3538(01)00211-1

[11] S.R. Agnew, M.H. Yoo, C.N. Tome, Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y, Acta. Mater. 49 (2001) 4277-4289.

DOI: 10.1016/s1359-6454(01)00297-x

In order to see related information, you need to Login.