モルタルのAEと応力拡大係数との関係に関する研究(III)

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To determine the fracture toughness (stress intensity factor) K of mortar, the experimental investigations were carried out using the single edge notch beam and the chevron notch beam. By the three point bending tests, the influence of the depth, width and angle of notch, the size of cross section and the length of beams on fracture toughness K has been investigated. According to the experimental and analytical results, fracture toughness K of mortar is influenced by the relative notch depth and the relative length of beam slightly, but the width of slit, the angle of V notch and the size of cross section of beam have no effect on fracture toughness K of motar. From these results, if we make the some restrictive conditions on the specimen of the fracture toughness test, it may be considered that the linear fracture mechanics is applicable to estimate of the fracture toughness K of mortar. There is the good agreement between the detected AE sources and the crack positions of nothched beam under bendig load, and the dissipation energy of beam estimated from the area of load-displacement curve is proportion to the depth of crack in the tip of notch approximately. From these results, the degree of internal fracture in the beam can be estimated by the amounts of dissipation energy on the basis of caculation from the load-displacement curve or the AE counts detected from beam under bending load. Consequently, a method to determine the fracture toughness parameters based on the characteristic information of AE cumulative curve was proposed in this investigation.
神戸大学の論文

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尾崎叡司
神戸大学農学部

モルタルのAEと応力拡大係数との関係に関する研究(III)

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