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排序方式: 共有49条查询结果,搜索用时 203 毫秒
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KANG Zengqiao GAI Xiuying LI Jiabao WANG Zhongguang State Key Laboratory for Fatigue Fracture of Materials Institute of Metal Research Academia Sinica Shenyang China Research Assistant Institute of Metal Research Academia Sinica Shenyang China 《金属学报(英文版)》1992,5(6):477-483
Influence of residual stress and surface morphology induced by shot-peening on fatigue behav-ior of a medium temperature tempered spring steel 60 Mn has been studied.The compressiveresidual stress induced in the near-surface region may improve fatigue limit from 930 to 1010MPa,and the very high tensile residual stress in the interior may reduce it from 1010 to 940MPa,whereas the severe surface damage may cause a drop-off of it from 1010 down to 800MPa.Fatigue cracks initiated in such position where the equivalent Mises stress,includingresidual stress,exceeded the local strength of the material.The compressive residual stress,induced by shot-peening,may intensify the effect of crack closure,so as to decrease the crackgrowth rate. 相似文献
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基于SPH结合FEM的喷丸残余应力数值模拟 总被引:1,自引:0,他引:1
针对以往有限元模型中弹丸数量较少且为规则阵列排布的缺陷,采用光滑粒子流体动力学法(Smoothed particle hydrodynamics,SPH)与有限元法(Finite element method,FEM)相结合的方法,对喷丸过程进行数值模拟;使用MATLAB对弹丸空间位置坐标进行随机化处理,形成了大量丸粒冲击工件表面的随机喷丸仿真模型。通过分析确定了喷丸饱和时间,研究了喷射角度、弹丸流量对残余应力场的影响。结果表明:在喷丸参数一定的条件下,存在相应的饱和喷丸时间;研究喷丸参数对残余应力的影响时,应在喷丸达到饱和时间之后提取残余应力值;喷射角度增大,残余压应力增大;开始时弹丸流量增大,残余压应力会有所增大,但当其达到饱和值后,残余压应力不再变化。 相似文献
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Kocan Marcin Wagner Lothar Rack H. J. 《Journal of Materials Engineering and Performance》2005,14(6):765-772
This investigation examined the role of microstructure and surface finish on the high cycle fatigue (HCF) performance of TIMETAL
LCB (Ti-6.8Mo-4.5Fe-1.5Al). The as-received microstructure of LCB consisted of elongated β grains with a semicontinuous grain
boundary α layer. In contrast, a fine equiaxed β + spheroidized α LCB microstructure was achieved by hot swaging and solution
(recrystallization) anneal. The latter modification of the prior β grain structure, together with the size, morphology, and
distribution of the primary α phase, resulted in a significant enhancement in the tensile and HCF properties. Furthermore,
prestraining (PS), as would be expected during the fabrication of an automotive coil spring, and prior to aging for 30 min
at temperatures between 500 and 550 °C, led to additional increases in tensile strength. In contrast, the HCF performance
was always reduced when PS prior to aging was included in the overall processing procedure. Finally, shot-peening and roller-burnishing
both resulted in an increased fatigue life in the finite life regimen; however, significant reductions in the 107 cycle fatigue strengths were observed when these procedures were used. These observations have been explained by including
the effect of process-induced residual tensile stresses in the fatigue analysis, resulting in subsurface fatigue crack nucleation.
This paper was presented at the Beta Titanium Alloys of the 00’s Symposium sponsored by the Titanium Committee of TMS, held
during the 2005 TMS Annual Meeting & Exhibition, February 13–16, 2005 in San Francisco, CA. 相似文献
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The effect of hole drilling on fatigue and residual stress properties of shot-peened aluminum panels
J. Chaudhuri B. S. Donley V. Gondhalekar K. M. Patni 《Journal of Materials Engineering and Performance》1994,3(6):726-733
The effect of hole drilling after shot peening on the fatigue life and residual stress state of selected aluminum alloys was
investigated. Compared to the unpeened condition, the hole drilling after shot peening reduced the fatigue life of the 2024-T351
and 2324-T39 alloys to a small extent. On the other hand, the fatigue life of 7150-T7751 decreased considerably due to hole
drilling after shot peening.
A compressive residual stress was at the surface of the shot peened specimens. Hole drilling reduced the compressive residual
stress by 60%. The excess dislocation density was mostly concentrated at the surface of the specimens. 相似文献
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提高水力机械抗磨蚀性能的喷丸工艺数值分析 总被引:1,自引:0,他引:1
针对流体机械磨蚀特点,对喷丸工艺引起的残余应力场进行数值模拟。运用有限单元法对弹丸撞击后钢板材料表面应力分布进行了数值计算。讨论了弹丸直径、喷射速度与残余应力的关系,选择几组典型参数比较,分析不同情况下喷丸对局部变形的影响,进而探讨了水力机械防磨蚀的喷丸强化工艺参数的选择。 相似文献