👉 Plane shear is a phenomenon in which two or more planes are intersected by a surface and undergo a transformation where one plane (the principal plane) passes through the center of the other plane. This transformation can be described using the equation: z = z0 + f(x, y) where x and y represent the coordinates of the point that is being transformed, f(x, y) represents the function or formula for determining the direction of the principal plane (i.e., the normal vector), and