**5. Conclusions**

To determine the influence of high peening coverage on Almen intensity and RCS, a quantitative description of the peening coverage has been developed in this paper firstly. Based on the quantitative description, the finite element simulation of the Almen test and Almen test are carried out. The following conclusions can be drawn:


Before this study, it is difficult to predicate the influence of high peening coverage on the Almen intensity and RCS well. This study can supply an effective method to solve this problem.

**Author Contributions:** Z.Y. conceived the paper. Z.Y., Y.L. and S.H. wrote the paper and clarified the key methods and results. W.J. helped in the F.E. simulation. Z.Y., S.H. and J.Z. edited the manuscript. All authors have read and agreed to the published version of the manuscript.

**Funding:** The authors are grateful to the support by National Key R&D Program of China [Grants No. 2016YFE0125600] and the National Natural Science Foundation of China [Grants No. 51405452].

**Conflicts of Interest:** The authors declare no conflict of interest.
