首页|Vibration-assisted material damage mechanism:From indentation cracks to scratch cracks
Vibration-assisted material damage mechanism:From indentation cracks to scratch cracks
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Vibration-assisted grinding is one of the most promising technologies for manufacturing optical components due to its efficiency and quality advantages.However,the damage and crack propagation mechanisms of materials in vibration-assisted grinding are not well understood.In order to elucidate the mechanism of abrasive scratching during vibration-assisted grinding,a kine-matic model of vibration scratching was developed.The influence of process parameters on the evo-lution of vibration scratches to indentation or straight scratches is revealed by displacement metrics and velocity metrics.Indentation,scratch and vibration scratch experiments were performed on quartz glass,and the results showed that the vibration scratch cracks are a combination of inden-tation cracks and scratch cracks.Vibration scratch cracks change from indentation cracks to scratch cracks as the indenter moves from the entrance to the exit of the workpiece or as the vibra-tion frequency changes from high to low.A vertical vibration scratch stress field model is estab-lished for the first time,which reveals that the maximum principal stress and tensile stress distribution is the fundamental cause for inducing the transformation of the vibration scratch cracking system.This model provides a theoretical basis for understanding of the mechanism of material damage and crack propagation during vibration-assisted grinding.
Vibration assisted grindingIndentationVibration scratchMaterial removal mecha-nismStress field modelCrack propagation mechanism
Key Laboratory of Advanced Ceramics and Machining Technology,Ministry of Education,Tianjin University,Tianjin 300072,China
Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education,Tianjin University,Tianjin 300072,China
Science and Technology of Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Tianjin
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