微观组织及残余应力对瑞利波评价激光熔覆层应力的影响
发布时间：2019-01-21 16:19
【摘要】：采用瑞利波评价激光熔覆层表面应力,结合静载拉伸试验,建立Fe314激光熔覆层中瑞利波的声弹关系曲线;通过对声弹关系曲线拟合实现对激光熔覆材料声弹系数的标定,在此基础上建立声弹公式;通过试验验证声弹公式评价激光熔覆层表面应力的可行性。分析激光熔覆层微观组织及残余应力对应力评价结果的影响,试验结果表明,这两种因素会显著影响熔覆层表面应力评价结果,采用声弹公式计算出的初始应力校准之后,理论计算结果与实际加载值更为接近,并且误差保持在可接受的范围之内。此外,由于静载拉伸过程中各向异性激光熔覆层变形不均匀,瑞利波检测应力试验中高应力阶段的误差明显大于低应力阶段误差。
[Abstract]:In this paper, Rayleigh wave is used to evaluate the surface stress of the laser cladding layer, and the acoustic-elastic relationship curve of the Rayleigh wave in the Fe314 laser cladding layer is established by combining the static load tensile test. The feasibility of the surface stress of the laser cladding layer is evaluated by means of the experimental verification of the acoustic-elastic formula. The effect of the microstructure and residual stress of the laser cladding on the results of the stress evaluation is analyzed. The results show that the two factors can significantly influence the results of the stress evaluation on the surface of the cladding, and after the initial stress calibration calculated by the acoustic-elastic formula, The theoretical calculation result is closer to the actual load value and the error remains within the acceptable range. in addition, that error of the high stress stage in the Rayleigh wave detection stress test is obviously lar than that of the low stress stage due to the non-uniform deformation of the anisotropic laser cladding layer during the static load drawing process.
【作者单位】： 装甲兵工程学院装备再制造技术国防科技重点实验室;北京理工大学机械与车辆学院;
【基金】：国家重点基础研究发展计划(973计划,2011CB013403) 国家自然科学基金(50975287)资助项目
【分类号】：TG174.4;TG115
本文编号：2412821
[Abstract]:In this paper, Rayleigh wave is used to evaluate the surface stress of the laser cladding layer, and the acoustic-elastic relationship curve of the Rayleigh wave in the Fe314 laser cladding layer is established by combining the static load tensile test. The feasibility of the surface stress of the laser cladding layer is evaluated by means of the experimental verification of the acoustic-elastic formula. The effect of the microstructure and residual stress of the laser cladding on the results of the stress evaluation is analyzed. The results show that the two factors can significantly influence the results of the stress evaluation on the surface of the cladding, and after the initial stress calibration calculated by the acoustic-elastic formula, The theoretical calculation result is closer to the actual load value and the error remains within the acceptable range. in addition, that error of the high stress stage in the Rayleigh wave detection stress test is obviously lar than that of the low stress stage due to the non-uniform deformation of the anisotropic laser cladding layer during the static load drawing process.
【作者单位】： 装甲兵工程学院装备再制造技术国防科技重点实验室;北京理工大学机械与车辆学院;
【基金】：国家重点基础研究发展计划(973计划,2011CB013403) 国家自然科学基金(50975287)资助项目
【分类号】：TG174.4;TG115
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1 魏勤;卫婷;宋广三;;超声瑞利波测试材料表面载荷应力的实验研究[J];实验力学;2011年02期
，本文编号：2412821
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