Analysis of the Local Stress Field of the Steel Surface under Pneumatic Impact Repairing Technique
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摘要: 针对气动冲击作用下钢材表面局部应力场开展试验研究，从宏观和微观角度分析冲击作用下构件表面的残余应力场变化规律及硬化程度。同时，建立冲击过程的静力等效模型，分析不同的冲击参数对其残余应力场分布规律的影响，结果表明随着冲击的进行，试件表面残余压应力逐渐增大，且增幅趋于平缓，同时钢材表面晶格尺寸减小、硬化程度提高。有限元分析结果显示冲击作用下可以使构件产生明显的残余压应力，随着材料硬化程度的提高，增大冲击频率对残余压应力的提高效果不明显，较大尺寸的冲击头使得残余压应力分布更为均匀，范围更大。Abstract: Experimental research on local stress surface under pneumatic impact technique was carried out. The variation law and hardening degree of residual stress field on the surface of components under impact were analyzed from macroscopic and microscopic perspectives. Meanwhile, the static equivalent model of pneumatic impact was established to analyze the influence of different impact parameters on the distribution of residual stress field. The results indicated that the residual compressive stress on the surface of the specimen is increased after impacting, while the trend seems to slowed down. The lattice size of the steel surface decreases, and the hardening degree increases. The finite element analyzing results show that residual compressive stress can be produced obviously under impact. With the increase of material hardening degree, the increase of impact frequency has no obvious effect on the improvement of residual compressive stress, while the larger impact head made the distribution of residual compressive stress more uniform.
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Keywords:
- pneumatic impact /
- steel /
- lattice hardening /
- residual stress field
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