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<p>The stress intensity factor is a key parameter in rock fracture growth under loading. Understanding fracture toughness across different modes is essential for the safe design of geo-engineering structures. This study aims to explore mode-I and mixed mode-(I + II) fracture toughness of semi-circular bend (SCB) samples using the acoustic emission (AE) monitoring technique. Three different types of rocks from India, namely khondalite, limestone, and basalt, have been selected to examine the nature of the fracturing process. Twenty-seven SCB specimens were tested at a constant loading rate of 0.5 kN/min and various notch angles (0°, 15°, and 30°). The experimental results of fracture toughness for different rock types indicate that mode-I fracture toughness gradually decreases as the notch angles increase; however, mixed mode fracture toughness rises significantly as notch angles increase. The AE counts and AE energy reveal four distinct stages of fracture propagation in various modes during the compression process until the rock collapses. This research enhances the understanding of fracturing processes using the AE technique.</p>

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Fracture toughness of three Indian crystalline rocks: Insights from acoustic emission analysis

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Tariq Anwar Ansari,
  • Hemant Kumar Singh,
  • Bankim Chandra Mahanta,
  • Trilok Nath Singh

摘要

The stress intensity factor is a key parameter in rock fracture growth under loading. Understanding fracture toughness across different modes is essential for the safe design of geo-engineering structures. This study aims to explore mode-I and mixed mode-(I + II) fracture toughness of semi-circular bend (SCB) samples using the acoustic emission (AE) monitoring technique. Three different types of rocks from India, namely khondalite, limestone, and basalt, have been selected to examine the nature of the fracturing process. Twenty-seven SCB specimens were tested at a constant loading rate of 0.5 kN/min and various notch angles (0°, 15°, and 30°). The experimental results of fracture toughness for different rock types indicate that mode-I fracture toughness gradually decreases as the notch angles increase; however, mixed mode fracture toughness rises significantly as notch angles increase. The AE counts and AE energy reveal four distinct stages of fracture propagation in various modes during the compression process until the rock collapses. This research enhances the understanding of fracturing processes using the AE technique.