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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Related Experiment Video

Updated: Nov 28, 2025

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
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Stress Estimation through Deep Rock Core Diametrical Deformation and Joint Roughness Assessment Using X-ray CT

Hanna Kim1, Melvin B Diaz2, Joo Yeon Kim2

  • 1Korea Institute of Geoscience and Mineral Resources, 124, Gwahak-ro Yuseong-gu, Daejeon 34132, Korea.

Sensors (Basel, Switzerland)
|December 2, 2020
PubMed
Summary

This study estimated in-situ stress using diametrical core deformation analysis on a deep geothermal rock core. Results show a horizontal stress difference and suggest joint roughness anisotropy can indicate stress orientation.

Keywords:
X-raydiametrical core deformation analysis (DCDA)joint roughnessstress estimation

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Area of Science:

  • Geotechnical Engineering
  • Rock Mechanics
  • Geophysics

Background:

  • In-situ stress estimation is critical for underground projects.
  • No single method is error-free, necessitating combined approaches.
  • Deep geothermal projects require accurate stress assessments.

Purpose of the Study:

  • To assess in-situ stresses for a geothermal project at 4.2 km depth.
  • To evaluate the diametrical core deformation analysis (DCDA) method.
  • To explore the relationship between stress orientation and joint roughness.

Main Methods:

  • Analysis of a deep granodiorite rock core (100 mm diameter).
  • Application of the diametrical core deformation analysis (DCDA) method.
  • Industrial X-ray computed tomography (CT) for diametrical deformation measurement.

Main Results:

  • Average horizontal stress difference of 13.3 MPa was determined.
  • Results align with data from a nearby exploration well.
  • Correlation found between maximum horizontal stress and minimum joint roughness coefficient orientation.

Conclusions:

  • The DCDA method provides reliable in-situ stress estimations.
  • Joint roughness anisotropy may serve as an indicator for stress orientation.
  • Further research can refine stress tracking using geological features.