Primitive research in ductile shear zone proposed that the heterogeneous simple shear is a dominate deformation regime (Ramsay, 1980; Ramsay and Allison, 1979; Ramsay and Graham, 1970; Simpson, 1981; Watts and Williams, 1983) but recent research indicates that in most of the shear zones involve three-dimensional combinations of simple and

pure shear strain, such as transpression and transtension zone (Bhattacharyya and Hudleston, 2001; Montesi, 2013; Liang et al., 2015; Fossen and Cavalcante, 2017; Behyari and Moghadam, 2018).

Hence, the remaining strains are [[gamma].sub.xz] and [[gamma].sub.yz], which are respectively the shear strains of the xz-plane and yz-plane and thus leaving the bar under

pure shear.

Although it gives plain

pure shear stress state, it is best suited for large sized specimens therefore it would require a lot of time to prepare specimens and to test them [2].

To further investigate the fracture mode of 6005 Al alloy during tensile,

pure shear, and tensile-shear combined tests, some magnified fracture surfaces are collected by a scanning electron microscope (SEM).

Thus, the specimen is not completely in a state of

pure shear, which can lead to great measurement errors or even the wrong conclusions.

A Biaxiality of zero corresponds to uniaxial stress, a value of -1 corresponds to

pure shear, and a value of 1 corresponds to a pure biaxial state.

They reported that [[omega].sub.c] itself is a natural frequency and presented the mode shape at to = [[omega].sub.c], which has been recognized as the "

pure shear mode" [31].

The fracture mechanics based fatigue crack propagation (FCP) test, which utilizes a "

pure shear" test specimen, was used to determine how the crack growth behavior of rubber compounds changes with aging (refs.

The difference between the temperature rise due to viscous or shear heating plus frictional heating (slip flow), [[DELTA]T.sub.vh + fh], and that due to

pure shear or viscous heating (no slip), [[DELTA]T.sub.vh], is called frictional heating, [[DELTA]T.sub.fh], in this work and is plotted as a function of [v.sub.s] in Fig.

where [G.sub.0] is the transversal elasticity module for the intact material, [[gamma].sub.0] is the corresponding deformation for the peak stress in a test of

pure shear, [[gamma].sub.u] is the last deformation admitted for the material in a

pure shear test and [[alpha].sub.T] is the straight inclination in the 'softening' branch.