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<p>Understanding the effects of high-temperature exposure on rocks is essential for improving the stability of structures in geothermal reservoirs, nuclear waste storage, and fire-damaged environments. Despite significant advances, several critical aspects of thermal damage remain inadequately explored, particularly those related to strain localization, critical strain thresholds, and geometric damage attributes. This study addresses these gaps by employing two-dimensional Digital Image Correlation (2D-DIC) to quantify the full-field deformational behavior of thermally treated Agaria marble (AM) under uniaxial loading. Prismatic AM specimens were subjected to thermal treatments at 300&#xa0;°C, 500&#xa0;°C, and 560&#xa0;°C to induce controlled thermal damage, followed by mechanical loading with synchronous full-field strain monitoring. This methodology uniquely applies 2D-DIC after thermal exposure to capture and characterize the initial damage state. Key parameters evaluated include critical tensile strain limit <i>ɛ</i><sub><i>c</i></sub>, stress thresholds for crack closure (CC), crack initiation (CI), crack damage (CD), strain-field heterogeneity, tensile damage density, and mean damage diameter. Results revealed significant mechanical degradation with increasing thermal treatment, consistent with microstructural weakening and reduced brittleness. Thermally treated specimens exhibited increased CC and CI thresholds, expressed as percentages of the respective uniaxial compressive strength (UCS), while the CD threshold remained relatively stable. The tensile damage present immediately after thermal treatment increased non-linearly with temperature, accompanied by an increase in <i>ɛ</i><sub><i>C</i></sub>, indicating enhanced strain tolerance. At equivalent tensile damage levels, thermally treated specimens showed lower <i>ɛ</i><sub><i>33</i></sub> heterogeneity and reduced damage density but larger mean crack diameters, indicating more localized and coalesced damage evolution relative to untreated specimens.</p>

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Impact of Thermal Damage on the Full-Field Deformational Behavior of Agaria Marble Under Uniaxial Loading

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Girish Chand,
  • Deepanshu Shirole,
  • Mohammadreza Aghajanzadeh,
  • Hossein Masoumi

摘要

Understanding the effects of high-temperature exposure on rocks is essential for improving the stability of structures in geothermal reservoirs, nuclear waste storage, and fire-damaged environments. Despite significant advances, several critical aspects of thermal damage remain inadequately explored, particularly those related to strain localization, critical strain thresholds, and geometric damage attributes. This study addresses these gaps by employing two-dimensional Digital Image Correlation (2D-DIC) to quantify the full-field deformational behavior of thermally treated Agaria marble (AM) under uniaxial loading. Prismatic AM specimens were subjected to thermal treatments at 300 °C, 500 °C, and 560 °C to induce controlled thermal damage, followed by mechanical loading with synchronous full-field strain monitoring. This methodology uniquely applies 2D-DIC after thermal exposure to capture and characterize the initial damage state. Key parameters evaluated include critical tensile strain limit ɛc, stress thresholds for crack closure (CC), crack initiation (CI), crack damage (CD), strain-field heterogeneity, tensile damage density, and mean damage diameter. Results revealed significant mechanical degradation with increasing thermal treatment, consistent with microstructural weakening and reduced brittleness. Thermally treated specimens exhibited increased CC and CI thresholds, expressed as percentages of the respective uniaxial compressive strength (UCS), while the CD threshold remained relatively stable. The tensile damage present immediately after thermal treatment increased non-linearly with temperature, accompanied by an increase in ɛC, indicating enhanced strain tolerance. At equivalent tensile damage levels, thermally treated specimens showed lower ɛ33 heterogeneity and reduced damage density but larger mean crack diameters, indicating more localized and coalesced damage evolution relative to untreated specimens.