軟鋼の衝撃弾塑性破壊靱性に関する研究 : 第2報,三点曲げ試験片のCTODと限界CTOD

概要

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In this paper we describe an experimental study of the CTOD under impact loading in an attempt to clarify the dynamic fracture mechanism of mild steel. The drop test apparatus and air-gun exprimental apparatus, which allowed measurement of the displacement rate of the load point, were developed by the authors, and were used in an impact three-point bend test to investigate the influence of displacement rate on CTOD under various loading speeds. Three-dimensional FEM calculations were performed to compare the experimental results with the simulation results. Additionally, CTOD-Δa curves and values of critical CTOD were determined through three-point bend tests under three different displacement rates. Finally, influences of displacement rate on CTOD, critical CTOD and fractured surface pattern of specimens were discussed based on the experimental results, calculated results and observation of the fractured surface. It was found that the CTOD values and the critical CTOD values decrease with increasing displacement rate.
1995-04-25