衝撃荷重下における材料の破壊強度評価

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  • ショウゲキ カジュウ カ ニ オケル ザイリョウ ノ ハカイ キョウド ヒョウカ

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Abstract

<p>A simple procedure was developed in order to estimate dynamic stress intensity factors under impact loading. The dynamic stress intensity factors were computed by superposing step response functions for crack-tips subjected to stress wave loading. The step response function was evaluated from the ratio of the dynamic crack opening displacement to the static one calculated by the same finite element model. The accuracy of this procedure was verified from the　comparison of numerical results with analytical ones. The impact fracture experiments using circumferentially-notched round bar and center-notched disk specimens were performed and simulated to estimate the dynamic stress intensity factors. The onset of dynamic fracture was detected using the strain gage near the crack-tip. The dynamic fracture initiation toughness was measured at stress intensity factor rates of 105 to 106 MPa√ｍ/s. The experimental results were presented to elucidate the influence of loading rate on the pure mode If racture toughness for metallic alloys, metal-matrix composites, ceramics and glasses. Using center-notched and pre-cracked disk specimens, the impact fracture test method in diametralcompression was developed to measure the dynamic fracture toughness under combined mode I/II loading conditions. Some experimental results were presented to discuss the influence of mixed-mode loading and guidelines for the accurate evaluation of dynamic fracture strength of materials under impact loading.</p>

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