片側切欠きばりの4点曲げ試験（4SENB試験）による木材および中密度繊維板の<i>K</i><sub>Ic</sub>値の測定

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  • Measurement of the Mode I Critical Stress Intensity Factor of Solid Wood and Medium-Density Fiberboard by Four-Point Single-Edge-Notched Bending (4SENB) Test
  • 片側切欠きばりの4点曲げ試験(4SENB試験)による木材および中密度繊維板のK[Ic]値の測定
  • カタガワ キリカキバリ ノ 4テン マゲ シケン(4SENB シケン)ニ ヨル モクザイ オヨビ チュウ ミツド センイバン ノ K[Ic]アタイ ノ ソクテイ

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<p>Mode I critical stress intensity factor KIc obtained by four-point single-edge-notched bending (4SENB) tests of wood and medium-density fiberboard (MDF) was experimentally and numerically analyzed. To determine the critical load for crack propagation, the relationship between the load and loading-line deflection (LLD) and that between the load and crack opening displacement (COD) were measured, and the results obtained were compared with each other. Additionally, a double cantilever beam (DCB) test was conducted and the results were compared with those of 4SENB tests. Similar to the results obtained in several previous studies, the value of KIc was obtained by introducing an additional crack length into appropriate equations as the crack geometry factor used for analyzing the 4SENB test. Additionally, the load-COD relationship was more sensitive in detecting the crack propagation than the load-LLD relationship, so the measurement of COD is recommended for determining the KIc value in the 4SENB test accurately.</p>

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  • 材料

    材料 66 (5), 323-327, 2017

    公益社団法人 日本材料学会

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