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In order to study the characteristics of residual stress distribution on DP980 high-strength steel treated by Laser Peening (LP), a finite element analysis model was established to analyze the influence of different LP times on the stress distribution both on the surface and in the depth of the material. Additionally, strenuous tests with different LP times were carried out, and the residual stress of samples was tested to verify the consistency of experiment and simulation results. By comparing the surface roughness of the samples before and after LP, it indicates that plastic deformation occurs on the sample surface, and a uniform residual stress distribution is generated on the surface after LP. In order to achieve the internal stress balance, a low-amplitude tensile stress is induced at the core of the sample along the depth direction. With the increase of LP times, the residual stress induced on the surface of sample rises, and a deeper influence layer is generated. In fact, the residual stress induced by LP on the material surface increases the micro-crack closure force inside the parts and then postpones the crack growth rate, thus improves the service life and reliability of parts effectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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