Investigation of Shot Peening Effect on Titanium Alloy Affecting Surface Residual Stress and Roughness for Aerospace Applications

Kumar, R. K.; Sampathkumaran, P.; Seetharamu, S.; Kumar, S. Anand; Pramod, T.; Naveen, G. J.

doi:10.1016/j.prostr.2019.05.018

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…As shown in Figure 10a, the arc height increases with additional peening passes W; the Almen intensity varies approximately linearly with the air pressure, as shown in Figure 10b. Similar studies include Kumar and Sampath Kumaran [7] and Mohamed and Farhat [25].…”

Section: Experimental Measuresmentioning

confidence: 62%

“…In the present work, the number of shots is controlled by the nozzle movement velocity for a given shot type, mass flow, distance from the nozzle to the strip and impact angle. The shot number for simulation is calculated by using Equation (7). In this paper, it is assumed that h is 70 mm, corresponding to the distance from the nozzle to the strip; l is 76 mm; and V R is 1000.0 mm/min.…”

Section: A New Methods For Calculating the Shot Stream Numbermentioning

confidence: 99%

“…Miao and Demers [ 6 ] reported that quantitative relationships between the saturation, coverage and surface roughness regarding exposure time have been obtained based on Almen-sized Al2024 strips. Kumar and Sampath Kumaran [ 7 ] designed experiments and established a relationship between the Almen intensity and air pressure based on titanium alloy. However, the Almen strip test has certain limitations.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Approach to Direct Simulation of an Actual Almen Shot Peening Intensity Test with a Large Number of Shots

et al. 2020

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In existing simulations of the Almen intensity test, arc height is indirectly obtained by an equivalent method including a representative cell, a few shots and equivalent loading. Most of these equivalent methods cannot consider the transverse deformation of the strip, the complex stress state of the plastic hardening layer and process parameters, resulting in deviation from the actual test. This paper introduces an improved and experimentally validated discrete element model (DEM)-finite element model (FEM) to predict the actual Almen intensity. The improvement of this model is mainly reflected in the large and real number of shots involved in the actual Almen intensity test, shot–shot interactions, and real-size solid finite element model of the Almen strip. A new method for calculating the shot stream is proposed based on the test and considering test process parameters such as the mass flowrate, nozzle movement speed and nozzle–workpiece distance. The shot stream impacting the strip with a fully restrained underside was first simulated in improved DEM-FEM to bring the forming energy. As a second step, an implicit solver of the Almen strip FEM calculates the spring-back to simulate strip removal from the holder. The results achieved by the present approach are compared with the results obtained by the experimental results and those in the literature. The results show that the arc height and Almen intensity obtained by the present approach match much better with the literature than the traditional method. Some new results obtained by the improved coupling DEM-FEM method are presented. The influences of the transverse deformation and surface plastic layer on the deformation of the Almen strip are discussed. This improved method provides an alternative characterization method for precision peen forming simulation.

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Section: Experimental Measuresmentioning

confidence: 62%

Section: A New Methods For Calculating the Shot Stream Numbermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Improved Approach to Direct Simulation of an Actual Almen Shot Peening Intensity Test with a Large Number of Shots

et al. 2020

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“…It's worth pointing out that Venturi tube plays an extremely important role in the transportation of medium (i.e. powder, particles and liquid) in manufacturing industry, such as shot peening, water jet, sand blasting [4] [5] [6] [7] [8]. Strengthen grinding technology [9] [10], which employs a three-phase jet flow that consists of abrasive powders, steel balls and grinding fluids to shoot workpiece, emerges as a new solution to improve the fatigue life of metals (See Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Design Optimization Analysis of Venturi Tube for Medium Conveying in Strengthen Grinding Process

Xiao¹,

Liang²,

Liu³

et al. 2021

ENG

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Venturi tubes are widely used in manufacture and chemical industry and attract broad attention. To improve the transmission efficiency, the optimization of Venturi tube has been carried out, the transport substances involved in either liquid, solid, gas or two of them. The Venturi tubes that used for conveying of three-phase flow, which is consisted of solid, liquid and gas, are poorly investigated. In this paper, a Venturi tube employed in one surface treatment equipment was proposed. The velocity and pressure distribution in the flow field of Venturi tube with different key geometric parameters including diameter ratio, convergence angle and diffuser angle have been studied. One optimal solution has been selected. The negative pressure of suction port can reach a value as high as −1550 Pa to −1600 Pa. Such negative pressure offers the opportunities for transporting mixed abrasive.

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“…This can induce elasticplastic strain in metal material, and induce a compressive residual stress field (RSF) in the material surface. Compared with the classical shot peening, [1][2][3][4] the impact positions of the shots are disordered, random, and chaotic for the classical shot peening, while the impact positions of the shots are regular and controllable by adjusting peening parameters for abrasive water jet sequential peening (AWJSP). In AWJP process, shots pass through a nozzle with dense carrier water to reach a certain velocity, and then the shots impact on the target material.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of surface topography and residual stress after abrasive water jet sequential peening

Cui

Zhao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this paper, the theoretical models of the surface topography and residual stress (RS) were proposed, and the abrasive water jet sequential peening (AWJSP) finite element models were established by using ABAQUS. Then, the formation mechanism of the surface topography in multiple passes AWJSP process and the coupling mechanism of RS in a single and multiple passes AWJSP process were analyzed. After that, the influence of the number of shots (i.e. N), the distance between the center of adjacent shots Dc, shot velocity v, and shot radius R on the surface topography and residual stress field (RSF) of the target were investigated. Results show that successive dimples were formed by single-pass AWJSP, the RSF formed by the impact of each shot will influence the previous RSF, and that will be coupled with it. In multiple passes AWJSP process, decreasing Dc can decrease the surface roughness, the surface smoothness of the target material will gradually become better, and the RSF will also be uniform. Under full coverage condition, the surface roughness Rt and mean width of the profile Rsm will gradually decrease with the decrease of Dc, while the change of Dc has little influence on the RSF. Increasing the v can increase Rt and Rsm, and it is beneficial to induce a large and deep compressive RS layer. Increasing the R can decrease Rt, Rsm remains unchanged, and it is beneficial to induce a deep compressive RS layer.

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Investigation of Shot Peening Effect on Titanium Alloy Affecting Surface Residual Stress and Roughness for Aerospace Applications

Cited by 17 publications

References 8 publications

An Improved Approach to Direct Simulation of an Actual Almen Shot Peening Intensity Test with a Large Number of Shots

An Improved Approach to Direct Simulation of an Actual Almen Shot Peening Intensity Test with a Large Number of Shots

Design Optimization Analysis of Venturi Tube for Medium Conveying in Strengthen Grinding Process

Numerical simulation of surface topography and residual stress after abrasive water jet sequential peening

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