光干渉法による切欠先端のひずみ分布の測定 : 塑性域ならびに厚み方向ひずみと COD 値の関連

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Using an optical interference method, the plastic strain behaviours and the progress of the through-the-thickness deformation close to the crack tip were observed continuously on 3-point bending test specimens, made of nitrogen containing mild steel and HT 80 steel. The plastic zones on plate surface and interior section were determined also by etching technique for comparison. In addition, the fracture criterion, COD, was discussed based on the observed plastic strain behaviours and the progress of the through-the-thickness deformation. Main results are summarized as follows : (1) The plastic zone and the through-the-thickness deformation close to the crack tip both loading and unloading could be measured by optical interference technique using sodium light source. (2) At local yielding stage near the crack tip, the length of plastic zone on plate surface was larger than that on interior section. But when the hinge type plastic strain widely spreaded on both cases, the length of plastic zone on plate surface was about the same or rather smaller than that on interior section. (3) The crack opening displacement was proportional to the through-the-thickness deformation near the crack tip. Moreover, the crack opening displacement was confirmed to be proportional to the size of plastic zone. But its proportionality was different each other at local yielding stage near the crack tip and hinge type plastic strain stage.
社団法人溶接学会の論文
1978-07-05

光干渉法による切欠先端のひずみ分布の測定 : 塑性域ならびに厚み方向ひずみと COD 値の関連

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