Sub-surface crack formation in ultrasonic vibration-assisted grinding of BK7 optical glass

Zhao, Peiyi; Zhou, Ming; Huang, Shao Nan

doi:10.1007/s00170-017-0622-5

Cited by 11 publications

(2 citation statements)

References 23 publications

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“…Li [12] developed an analytical SSCD model based on the analysis of crack sizes and microscopic asperity (Rz). However, the crack forms considered in that work were strictly limited to the median and lateral cracks, whereas subsurface cracks often vary in both shape and size [13]. Li innovatively researched the fracture behavior and the threshold load in radial crack propagation by conducting a nanoindentation test [14].…”

Section: Introductionmentioning

confidence: 99%

Crack Forms Sensitivity-Based Prediction on Subsurface Cracks Depth in Ultrasonic-Vibration-Assisted Grinding of Optical Glasses

Zhao¹,

Zhang²,

Liu³

2021

Applied Sciences

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Subsurface cracks in ultrasonic-vibration-assisted grinding (UVAG) of optical glasses often exhibit diverse forms and proportions. Due to the variety of loads involved in crack formation and propagation, the crack forms and propagation depths have different sensitivities to each process parameter. Predicting the maximum subsurface cracks depth (MSSCD) by considering the varying effects of process parameters plays a key role in implementing effective control of the UVAG process. In this work, the subsurface crack forms and their proportions are investigated by conducting 40 sets of UVAG experiments. The varying effects of the grinding and ultrasonic parameters on the crack form proportions are unveiled by using grey relational analysis. The weighted least square support vector machine (WLS-SVM) prediction model for the MSSCD was developed. Twelve sets of UVAG experiments were carried out to validate the proposed model. The results show that arc-shaped cracks and bifurcated cracks account for 72.5% of all cracks, while ultrasonic vibration amplitude influences most of the proportions of arc-shaped and bifurcated cracks. Compared to other widely used prediction methods, the maximum and average relative prediction errors of the proposed model are 10.54% and 5.59%, respectively, which proves the high prediction accuracy of the model.

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Section: Introductionmentioning

confidence: 99%

Crack Forms Sensitivity-Based Prediction on Subsurface Cracks Depth in Ultrasonic-Vibration-Assisted Grinding of Optical Glasses

Zhao¹,

Zhang²,

Liu³

2021

Applied Sciences

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“…Therefore, the proportion of these removal methods on the machined surface determines the final machined surface quality and subsurface damage. Although studies at home and abroad have been able to control the surface roughness [24][25][26], processing efficiency [27,28], force and energies [29,30] or damages [31] by adjusting the process parameters, for the precision machining of brittle materials that pay attention to the surface quality and subsurface damage at the same time, the intrinsic relationship between the proportion of the material removal modes and the process parameters and the parameters of the grinding wheel is still not clear. The effective control of the material removal modes proportion is the basis and key to exploring the technical measures to jointly improve the processing surface and subsurface quality.…”

Section: Introductionmentioning

confidence: 99%

Effect to the Surface Composition in Ultrasonic Vibration-Assisted Grinding of BK7 Optical Glass

et al. 2020

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Because of the changes in cutting conditions and ultrasonic vibration status, the proportion of multiple material removal modes are of uncertainty and complexity in ultrasonic vibration-assisted grinding of optical glass. Knowledge of the effect of machined surface composition is the basis for better understanding the influence mechanisms of surface roughness, and also is the key to control the surface composition and surface quality. In the present work, 32 sets of experiments of ultrasonic vibration-assisted grinding of BK7 optical glass were carried out, the machined surface morphologies were observed, and the influence law of machining parameters on the proportion of different material removal was investigated. Based on the above research, the effect of surface composition was briefly summarized. The results indicated that the increasing of spindle rotation speed, the decreasing of feed rate and grinding depth can improve the proportion of ductile removal. The introduction of ultrasonic vibration can highly restrain the powdering removal, and increase the proportion of ductile removal. Grinding depth has a dominant positive effect on the surface roughness, whereas the spindle rotation speed and ultrasonic amplitude both have negative effect, which was caused by the reduction of brittle fracture removal.

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Relationship between subsurface damage depth and breaking strength for brittle materials

Lakhdari

Belkhir

Bouzid

et al. 2019

Int J Adv Manuf Technol

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Sub-surface crack formation in ultrasonic vibration-assisted grinding of BK7 optical glass

Cited by 11 publications

References 23 publications

Crack Forms Sensitivity-Based Prediction on Subsurface Cracks Depth in Ultrasonic-Vibration-Assisted Grinding of Optical Glasses

Crack Forms Sensitivity-Based Prediction on Subsurface Cracks Depth in Ultrasonic-Vibration-Assisted Grinding of Optical Glasses

Effect to the Surface Composition in Ultrasonic Vibration-Assisted Grinding of BK7 Optical Glass

Relationship between subsurface damage depth and breaking strength for brittle materials

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