Is a simultaneous shearing same as a shearing in one direction followed by a shearing in another directionwhy?

No, simultaneous shearing is not the same as performing one shearing followed by another in a different direction. In simultaneous shearing, the material is subjected to shear forces from multiple directions at the same time, which can lead to different deformation patterns. In contrast, shearing in one direction followed by another involves sequential applications of stress, potentially resulting in cumulative effects that differ from those produced by simultaneous loading.