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It has thus been shown that, provided (J~/ (J~ is kept constant, compression without shear distortion can occur. However, it might be expected that compressive deformation would require a change in the mean value of the effective stresses «(J~ +(J~)/2. Increasing «(J~ +(J~)/2 will increase the values of both Fs and F n but will not, by itself, change the ratio Fj F n' Hence, in the absence of vibration or some other form of disturbance, a change in the mean of the effective pressures will not produce compression without shear distortion due to relative movement of the rods,


although some deformation due to the deformation of the rods themselves will occur.