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Evaluation of ring test with reference to deformation rate and specimen geometry in assessing the tensile behaviors of granite
International Journal of Rock Mechanics and Mining Sciences ( IF 7.0 ) Pub Date : 2024-11-26 , DOI: 10.1016/j.ijrmms.2024.105973
Manali Sarkar, Arindam Basu
International Journal of Rock Mechanics and Mining Sciences ( IF 7.0 ) Pub Date : 2024-11-26 , DOI: 10.1016/j.ijrmms.2024.105973
Manali Sarkar, Arindam Basu
Ring test for indirect tensile strength measurements utilizes disc specimens with a hole at the center of the disc. Such specimens are found to limit the stresses at the specimen-platen contact and transfer the tensile stress to the upper- and lower-hole boundaries in ring specimens. Researchers observed that the tensile strength of a ring specimen tends to decrease as the ratio of the hole-radius to the disc-radius (ρ) increases. However, there has been no research on how the tensile strength derived from ring specimens varies when loaded under different quasi-static strain rates or deformation rates. The strain analysis in case of ring tests also does not seem to have gained attention. In this study, ring specimens of Malanjkhand granite (India) with varying ρ (0.13, 0.17, 0.21 and 0.25) were quasi-statically loaded at 0.5 mm/min, 1.5 mm/min and 5.5 mm/min corresponding to strain rates of 1.75 × 10−4 s−1 , 5.26 × 10−4 and 1.93 × 10−3 s−1 , respectively. The combined effect of the deformation rate and specimen geometry (ρ) on the indirect tensile strength and deformation behavior was investigated. The Ring Tensile Strength (RTS) is found to be higher than the Brazilian Tensile Strength (BTS). RTS shows dependency on both the geometry of the ring specimen as well as the deformation rate. The tensile Tangent Deformation Modulus (Dv ) and the ratio of the horizontal strain to vertical strain, coined as Ring Strain Ratio (RSR), were estimated in this study from the tensile stress and vertical-horizontal strain data. A numerical finite element analysis was also performed in Abaqus to observe the stress distribution in both ring and Brazilian discs, where the results were found to be broadly conformable.
中文翻译:
在评估花岗岩的拉伸行为时,参考变形速率和试样几何形状评估环试验
用于间接拉伸强度测量的环状试验使用圆盘中心有孔的圆盘试样。发现此类试样限制了试样-模板接触处的应力,并将拉伸应力传递到环形试样的上孔和下孔边界。研究人员观察到,随着孔半径与圆盘半径 (ρ) 之比的增加,环形试样的抗拉强度往往会降低。然而,目前还没有关于在不同的准静态应变速率或变形速率下加载时环试样的拉伸强度如何变化的研究。环测试中的应变分析似乎也没有得到关注。在这项研究中,具有不同ρ(0.13、0.17、0.21和0.25)的Malanjkhand花岗岩(印度)环状试样以0.5 mm/min、1.5 mm/min和5.5 mm/min的准静态载荷,分别对应于1.75 × 10-4 s-1、5.26 × 10-4 和 1.93 × 10-3 s-1。研究了变形速率和试样几何形状 (ρ) 对间接拉伸强度和变形行为的综合影响。发现环拉伸强度 (RTS) 高于巴西拉伸强度 (BTS)。RTS 显示对环试样的几何形状和变形速率的依赖性。在本研究中,拉伸切线变形模量 (Dv) 和水平应变与垂直应变的比值,称为环形应变比 (RSR),是在这项研究中根据拉伸应力和垂直-水平应变数据估计的。还在 Abaqus 中进行了数值有限元分析,以观察环盘和巴西盘中的应力分布,结果发现结果大致一致。
更新日期:2024-11-26
中文翻译:
在评估花岗岩的拉伸行为时,参考变形速率和试样几何形状评估环试验
用于间接拉伸强度测量的环状试验使用圆盘中心有孔的圆盘试样。发现此类试样限制了试样-模板接触处的应力,并将拉伸应力传递到环形试样的上孔和下孔边界。研究人员观察到,随着孔半径与圆盘半径 (ρ) 之比的增加,环形试样的抗拉强度往往会降低。然而,目前还没有关于在不同的准静态应变速率或变形速率下加载时环试样的拉伸强度如何变化的研究。环测试中的应变分析似乎也没有得到关注。在这项研究中,具有不同ρ(0.13、0.17、0.21和0.25)的Malanjkhand花岗岩(印度)环状试样以0.5 mm/min、1.5 mm/min和5.5 mm/min的准静态载荷,分别对应于1.75 × 10-4 s-1、5.26 × 10-4 和 1.93 × 10-3 s-1。研究了变形速率和试样几何形状 (ρ) 对间接拉伸强度和变形行为的综合影响。发现环拉伸强度 (RTS) 高于巴西拉伸强度 (BTS)。RTS 显示对环试样的几何形状和变形速率的依赖性。在本研究中,拉伸切线变形模量 (Dv) 和水平应变与垂直应变的比值,称为环形应变比 (RSR),是在这项研究中根据拉伸应力和垂直-水平应变数据估计的。还在 Abaqus 中进行了数值有限元分析,以观察环盘和巴西盘中的应力分布,结果发现结果大致一致。