Promoted cutting and energy transition efficiency by an asymmetric cutter

IF 4.7 2区 工程技术 Q1 MECHANICS Engineering Fracture Mechanics Pub Date : 2024-11-03 DOI:10.1016/j.engfracmech.2024.110599
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Abstract

Laboratory and numerical tests were performed to understand the rock breakage mechanism of a CCS (constant cross section) cutter and an asymmetric cutter. The laboratory and numerical tests consistently show that the asymmetric cutter frequently generates larger breakage areas and consumes less indentation energy than the CCS cutter, but there is a defect spacing of 70 mm. Thus, the asymmetric cutter frequently has a higher cutting efficiency than the CCS cutter. In addition, the numerical tests reveal that the CCS cutter first generates a plastic zone and subsequently forms cracks to connect with the defect tips. In this process, a large proportion of the energy is wasted in the particle friction in the plastic zone. However, the asymmetric cutter tends to form much smaller plastic zones, which makes it difficult to generate particle friction. Only a small amount of friction energy is consumed in the later crack propagation process. Thus, the asymmetric cutter has a higher energy transition efficiency than the CCS cutter.
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通过非对称切割机提高切割和能源转换效率
为了解 CCS(恒定截面)铣挖机和非对称铣挖机的破岩机理,进行了实验室和数值测试。实验室和数值试验一致表明,与 CCS 切割器相比,非对称切割器经常产生更大的破碎区域,消耗更少的压痕能量,但缺陷间距为 70 毫米。因此,不对称铣刀的切割效率往往高于 CCS 铣刀。此外,数值测试表明,CCS 切割器首先产生塑性区,然后形成裂纹与缺陷尖端连接。在此过程中,很大一部分能量浪费在塑性区的颗粒摩擦上。然而,非对称切割机往往会形成小得多的塑性区,从而难以产生颗粒摩擦。在后来的裂纹扩展过程中,只有少量的摩擦能被消耗掉。因此,非对称切割机的能量转换效率高于 CCS 切割机。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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