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<p>Granite is a material that is frequently utilised in architectural settings for decorative purposes, as well as in the fabrication of highly precise testing apparatus. Nevertheless, the high hardness of granite presents a significant challenge in terms of its processing efficiency when subjected to sawing into slabs. The material removal process is predominantly reliant upon the stress-driven effect of interwoven cutting of lateral cracks. In this paper, an modified crack length and depth model is proposed considering the Rayleigh wave velocity and crack propagation velocity of granite, the material removal mechanism and crack propagation were analyzed by experimental and theoretical models. The amplitude of principal stress, stress <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40430_2025_5573_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sigma_{z}^{r}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mi>σ</mi> <mrow> <mi>z</mi> </mrow> <mi>r</mi> </msubsup> </math></EquationSource> </InlineEquation>, and the size of lateral cracks were analyzed by theoretical models. Then, multi-scratching tests were carried out on the surface of the workpiece by variable scratch depth to understand the lateral crack propagation and scratch force. The results showed that the observation of the size of lateral cracks of workpieces is consistent with the results of the theoretical analysis. In addition, the scratch speed has little influence on the scratch force. The study of multi-scratching in particular revealed that the interaction of adjacent lateral cracks promotes the propagation of lateral cracks. Fundamentally, the force of multi-scratching is smaller than that of a single scratch, and the reduced amplitude is related to the mechanical properties of granite. Theoretical analysis is in agreement with experimental observations. These findings contribute to a more profound comprehension of interference effects on crack propagation and offer a foundational framework for the optimization of segment design.</p>

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Investigating multi-diamond grit interactions in sawing granitic rocks: crack propagation and material removal mechanisms

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Depeng Sun,
  • Xiang Chang,
  • Jinsheng Zhang

摘要

Granite is a material that is frequently utilised in architectural settings for decorative purposes, as well as in the fabrication of highly precise testing apparatus. Nevertheless, the high hardness of granite presents a significant challenge in terms of its processing efficiency when subjected to sawing into slabs. The material removal process is predominantly reliant upon the stress-driven effect of interwoven cutting of lateral cracks. In this paper, an modified crack length and depth model is proposed considering the Rayleigh wave velocity and crack propagation velocity of granite, the material removal mechanism and crack propagation were analyzed by experimental and theoretical models. The amplitude of principal stress, stress \(\sigma_{z}^{r}\) σ z r , and the size of lateral cracks were analyzed by theoretical models. Then, multi-scratching tests were carried out on the surface of the workpiece by variable scratch depth to understand the lateral crack propagation and scratch force. The results showed that the observation of the size of lateral cracks of workpieces is consistent with the results of the theoretical analysis. In addition, the scratch speed has little influence on the scratch force. The study of multi-scratching in particular revealed that the interaction of adjacent lateral cracks promotes the propagation of lateral cracks. Fundamentally, the force of multi-scratching is smaller than that of a single scratch, and the reduced amplitude is related to the mechanical properties of granite. Theoretical analysis is in agreement with experimental observations. These findings contribute to a more profound comprehension of interference effects on crack propagation and offer a foundational framework for the optimization of segment design.