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摘要:
针对目前喷丸有限元仿真研究中弹丸规则排列、覆盖率无法精确计算的研究现状，基于ABAQUS二次开发建立了弹丸空间位置随机分布、弹丸数量由覆盖率决定的多弹丸喷丸有限元模型，实现了不同工况、不同喷丸覆盖率条件下所需弹丸个数的精确计算；在此基础上研究了不同喷丸参数对TC4钛合金材料表面残余应力与表面粗糙度的影响规律。进行了TC4喷丸试验，将得到的残余应力分布、表面粗糙度与仿真结果进行对比，验证了该有限元模型的合理性。研究成果对喷丸工艺参数的确定具有一定的指导意义。
Abstract:In view of the current research status on the finite element simulation study of shot peening, such as the projectiles' regular arrangement and the peening coverage cannot be calculated precisely, a finite element model with multiple randomly distributed shots whose number depends on the peening coverage was secondarily developed with ABAQUS, in which accurate number of required shots under different working conditions and different peening coverage is calculated. The influence of peening parameters on the surface residual stress and the surface roughness of TC4 titanium alloy material was studied. The TC4 shot peening experiment was carried out, residual stress distribution and surface roughness obtained by experiment were compared with those by simulation, and the results verified the reasonable prediction of residual stress distribution and surface roughness by the model, which has certain guiding significance for the determination of shot peening process parameters.
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Key words:
- TC4 titanium alloy /
- shot peening model /
- random distribution /
- coverage /
- residual compressive stress
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图 7 不同弹丸速度对残余应力场的影响
Figure 7. Effect of different projectile velocities on residual stress field
图 8 不同弹丸速度对材料表面粗糙度与最大残余压应力的影响
Figure 8. Effect of different projectile velocities on material surface roughness and maximum residual compressive stress
图 9 不同弹丸粒度对残余应力场的影响
Figure 9. Effect of different projectile particle sizes on residual stress field
图 10 不同弹丸粒度对材料表面粗糙度与最大残余压应力的影响
Figure 10. Effect of different projectile particle sizes on material surface roughness and maximum residual compressive stress
图 11 不同喷丸覆盖率对残余应力场的影响
Figure 11. Effect of different shot peening coverage on residual stress field
图 12 不同喷丸覆盖率对材料表面粗糙度与最大残余压应力的影响
Figure 12. Effect of different peening coverage on material surface roughness and maximum residual compressive stress
图 16 残余应力场试验值与仿真值对比
Figure 16. Comparison between experimental values and simulated values of residual stress field
表 1 基本材料参数
Table 1. Basic material parameters
参数 TC4 弹丸 密度/(t·mm-3) 4.428×10-9 7.8×10-9 弹性模量/GPa 110 200 泊松比 0.342 0.3 屈服强度/GPa 1.098 抗拉强度/GPa 1.092 
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参数 数值 A/MPa 1 098 B/MPa 1 092 n 0.93 m 1.1 熔点/K 1 878 参考温度/K 298 C 0.014 
1
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表 3 不同喷丸工况下达到98%覆盖率时所需弹丸个数
Table 3. Number of projectiles required to achieve 98% coverage under different shot peening conditions
工况 弹坑半径
ap/mm覆盖率达到98%
以上时所需
弹丸个数弹丸粒度/mm 弹丸速度/
(m·s-1)0.3 65 0.084 110 0.4 65 0.101 90 0.5 65 0.135 65 0.6 65 0.152 45 0.7 65 0.169 30 0.5 70 0.135 65 0.5 75 0.135 65 0.5 80 0.135 65 0.5 85 0.135 65
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