Experimental-numerical study of laser-shock-peening-induced retardation of fatigue crack propagation in Ti-17 titanium alloy

Sun, Rujian; Keller, Sören; Zhu, Ying; Guo, Wei; Kashaev, Nikolai; Klusemann, Benjamin

doi:10.1016/j.ijfatigue.2020.106081

Cited by 34 publications

(6 citation statements)

References 42 publications

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“…Generally, tensile residual stress, which is generated on the machined surface due to the low thermal conductivity of titanium alloys 38 and excessive temperature gradients on the machined surface, 36 is considered unfavorable for the component's service performance. Conversely, compressive residual stresses can significantly increase the service performance 39–42 . Note that the effect of residual stress on fatigue life is a dynamic process, 25 which means residual stress relaxation cannot be ignored in the prediction of fatigue life.…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of the effect of surface microgeometry and residual stress on conformal contact fretting fatigue crack initiation behavior

Song

Pei

et al. 2023

Fatigue Fract Eng Mat Struct

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Conformal contact is a commonly presented contact form in assemblies. Nonproportional loading is the main characteristics of conformal contact, which leads to prominent difficulty in revealing fretting crack behavior. In this paper, a finite element prediction model for Ti-6Al-4V pin-hole contact fretting fatigue crack initiation was developed, which simultaneously considered the effect of fretting wear, surface roughness, surface skewness, surface kurtosis, and residual stress. The results show that phase differences of stress component, change in direction of principal stress, and high stress gradient are the main reasons for the initiation of fretting fatigue under conformal contact condition. The model based on the Fatemi-Socie (FS) parameter successfully predicted the location, orientation, and fatigue life of crack initiation, which agrees well with the experimental results. Additionally, machining-induced residual stress can effectively inhibit mode I crack initiation at valleys. Moreover, ignoring the surface microgeometry characteristics reduces the prediction accuracy of the crack behavior.

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Section: Methodsmentioning

confidence: 99%

Numerical simulation of the effect of surface microgeometry and residual stress on conformal contact fretting fatigue crack initiation behavior

Song

Pei

et al. 2023

Fatigue Fract Eng Mat Struct

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“…and 4.88 times higher than that of the BM specimens, respectively. Additionally, as indicated by the residual stress results in Figure 8, surface compressive residual stress in the TLSPed-20 J specimen is higher than that in the TLSPed-30 J specimen, which can provide a higher resistance for the crack growth, and minimize the local stress level during cycling loading [47]. Such results also indicate that the effectiveness of LSP is not linear to the laser pulse energy, and laser pulse energy that is too high could even generate a negative effect on the fatigue life.…”

Section: Residual Stressmentioning

confidence: 95%

Laser Shock Peening of SiCp/2009Al Composites: Microstructural Evolution, Residual Stress and Fatigue Behavior

Sun¹,

Cao²,

Zhang

et al. 2021

Materials

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SiC particle reinforced aluminum alloy has a wide application in the aerospace industries. In this study, laser shock peening (LSP), an advanced surface modification technique, was employed for SiCp/2009Al composite to reveal its microstructure, microhardness and residual stress evolution. After peening, high densities of dislocations were induced in the aluminum substrate, and stacking faults were introduced into the SiC particle. The microhardness was increased from 155–170 HV to 170–185 HV, with an affected depth of more than 1.5 mm. Compressive residual stresses of more than 200 MPa were introduced. The three-point bending fatigue of the base material, laser peened and milled after laser peened specimens with artificial crack notch fabricated by a femtosecond laser was investigated. The average fatigue lives of laser peened and milled after laser peened specimens were increased by up to 10.60 and 2.66 times, compared with the base material. This combined fundamental and application-based research seeks to comprehensively explore the applicability of LSP on metal matrix composite.

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“…Ma et al [11] investigated the effects of constituent distribution and microstructure change on high-temperature creep properties of the aluminized layer in 321 stainless steel treated by laser shock processing (LSP). However, existing research about LSP are mainly focused on the laser-target material interaction mechanisms [6,12], effects of laser parameters on residual stress variation [8][9][10], and improvements in the mechanical performance of lasershock treated material [10,11,13,14]. There is little discussion on the LSP procedure analysis of the welded structures with the initial stress conditions (especially the welding residual stress) taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

Guo²,

Guo³

et al. 2023

Mater. Res. Express

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Laser shock processing (LSP) is an innovative approach, which effectively improves the mechanical behavior of metallic structures by introducing compressive residual stress. To evaluate the residual stress evolution in low-carbon 13Cr4Ni martensitic stainless steel multi-pass butt-welded joints induced by LSP, a two-step numerical simulation including welding analysis, at first, followed by LSP calculation with the simulated welding stress results being taken into account, was performed based on ABAQUS software. Effects of LSP parameters such as power density, spot size, overlapping rate and numbers of laser shock on the residual stress variations, were systematically investigated. To validate the reliability and accuracy of the numerical simulation, experiments of welding and LSP were conducted in sequence. The residual stress after welding and LSP were investigated by X-ray diffraction method. Results demonstrate that the simulated results show a good agreement with the experimental datas. The welding residual stress distribution is uneven. Larger tensile stresses appear on the weld surface and its adjacent heat-affected zone, which could be converted into high-level compressive stress after LSP. Furthermore, an ideal residual stress field can be obtained after two successive laser shocks with an overlap rate of 75% when the power density, spot diameter, and pulse width are 7.6 GW/cm2, 4 mm, and 25 ns, respectively.

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Experimental-numerical study of laser-shock-peening-induced retardation of fatigue crack propagation in Ti-17 titanium alloy

Cited by 34 publications

References 42 publications

Numerical simulation of the effect of surface microgeometry and residual stress on conformal contact fretting fatigue crack initiation behavior

Numerical simulation of the effect of surface microgeometry and residual stress on conformal contact fretting fatigue crack initiation behavior

Laser Shock Peening of SiCp/2009Al Composites: Microstructural Evolution, Residual Stress and Fatigue Behavior

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

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