Electric Signals Accompanying Fracture of Granite

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概要

• 論文の詳細を見る

• Pre-heated specimens of granite were uniaxially compressed. Electric charge of the order of $10^{-11}$ C accompanying fracture of the specimen was measured within a deformation accelerating precursory period until complete failure occurred. Specimens that had been pre-heated to 200°C exhibited the highest electric charge, and signal intensity decreased with increasing pre-heating temperature. Meanwhile, uniaxial strength of the specimen was the highest, 220 MPa, for the specimens that had been pre-heated to 200°C and it decreased with pre-heating temperature. Our results suggest that the intensity of the electric precursor signal detected prior to failure positively correlates with uniaxial strength. ESR signal intensity of the E$'$ center of quartz contained in the fractured granite specimen decreased upon failure. Stress-induced annealing of the E$'$ center is the suggested cause of the signal decrease.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2003-08-15

著者

• Enomoto Yuji

  Mechanical Engineering Laboratory

• Shirai Nobumasa

  Mechanical Engineering Laboratory Aist

• TSUTSUMI Akito

  Mechanical Engineering Laboratory, AIST

• TANAKA Satoshi

  Mechanical Engineering Laboratory, AIST

• Tsutsumi Akito

  Mechanical Engineering Laboratory, AIST, Tsukuba, Ibaraki 305-8564, Japan

• Enomoto Yuji

  Mechanical Engineering Laboratory, AIST, Tsukuba, Ibaraki 305-8564, Japan

• Shirai Nobumasa

  Mechanical Engineering Laboratory, AIST, Tsukuba, Ibaraki 305-8564, Japan

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