From the microscopic analyzes, VSR can be regarded as an additional dynamic stress in the form of a cyclic load applied to the workpiece. As we all know, the material used in the project is not an ideal elastomer inside there are different types of micro-defects. Therefore, whether steel, cast iron or other metals, there are varying degrees of stress concentration near where microscopic defects. When subjected to vibration, the residual stress is applied to the post of stress and change parts on the part of the stack. When the result of the superposition of the stress reaches a certain value, the stress concentration at the site of the worst will exceed the material yield strength and plastic deformation. This plastic deformation reduces the residual stress peak premises and to strengthen the metal substrate. Then, vibration and produce the same effect on some of the more serious stress concentration sites, until vibration additional stress and residual stress superposition of algebraic and not cause plastic deformation of any part of the date. In this case, the vibration will no longer produce the elimination of residual stress and homogenized and strengthen the role of metal. The above explanation has been a lot of tests to prove it.

From a macro perspective, the VSR plastic deformation of the workpiece, the residual stress reduction and homogenization and improved resistance to deformation of materials, the dimensional accuracy of the workpiece is undoubtedly leading to stable underlying causes. Analysis of residual stress relaxation and deformation of the workpiece can be seen from the presence of residual stress and instability caused by stress relaxation and redistribution, plastic deformation of the workpiece. VSR can reduce the residual stresses. Workpiece residual stress after vibration treatment can usually be reduced 30-60%, while also reducing the peak stress, the stress distribution uniform.

In addition to the residual stress, decided another important factor is the size of the workpiece stability slack rigidity, or resistance to deformation of the workpiece. Sometimes though parts have greater residual stress, but because of resistance to deformation ability, without causing large deformation. In this regard, VSR also showed significant effects. Load test results from the VSR shows that VSR-treated by their resistance to deformation of the workpiece is not only higher than the non-treated workpiece VSR, also higher than the aging by heat-treated workpiece. VSR through enormous resonance energy of the material will be strengthened, so that the dimensional accuracy of the workpiece to stabilize.

In addition, dislocations, slip character of a metal such as learning theory to explain the mechanism more VSR. The main point is the VSR process is actually exert some energy by moving the workpiece in a resonance state, to each part of the work (from the microscopic point of view of the workpiece in each microscopic lattice), if applied to this energy value and the microstructure itself the original energy value (residual stress itself is a potential energy) sum, enough to overcome the microstructure surrounding the potential well (it can be said to restore the balance of binding force), the region would have a microscopic plastic deformation, so that the residual stress generated distort parts to slowly back into balance state, the dislocation stress concentration to slip and re-pinning, and homogenizing aim to eliminate residual stresses. For the residual stress concentration, residual stress value is larger, reply equilibrium potential value of its microstructure itself has also larger, so, the more residual stress here in the process to eliminate vibration. Only from this point of view we can explain through a lot with the first view of the inexplicable phenomena. For example: In the vibration process we simply applied the initiative stress in one direction, it can be eliminated, including all active stress residual stress vertical direction.

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