【摘要】：采用數(shù)字激光動態(tài)焦散線測試系統(tǒng),研究爆炸應(yīng)力波作用下動裂紋與預(yù)制靜裂紋(水平夾角為90°、150°)相互作用機(jī)理,以及裂紋擴(kuò)展的動態(tài)行為。結(jié)果表明:(1)在動、靜裂紋貫通之前,靜裂紋兩端便出現(xiàn)焦散斑,動、靜裂紋貫通以后,靜裂紋沿爆炸應(yīng)力波傳播方向擴(kuò)展,并且擴(kuò)展速度小于動裂紋擴(kuò)展速度,也小于無靜裂紋時動裂紋擴(kuò)展速度;(2)靜裂紋存在時,動裂紋擴(kuò)展的總體長度減小。動裂紋起裂時間縮短,擴(kuò)展速度基本不受靜裂紋的影響,裂紋應(yīng)力強(qiáng)度因子值大于靜裂紋兩端值;(3)隨著靜裂紋水平夾角的增大,動、靜裂紋貫通時動裂紋沿水平方向偏轉(zhuǎn)距離增大,靜裂紋B端反向擴(kuò)展與動裂紋相互"咬合",C端裂紋擴(kuò)展位移和速度增大。
[Abstract]:The interaction mechanism of dynamic crack and precast static crack (90 擄, 150 擄) under explosive stress wave and the dynamic behavior of crack propagation are studied by using a digital laser dynamic caustic line test system. The results show that: (1) there are scorch speckles at the two ends of the static crack before the dynamic and static crack passes through, and the static crack propagates along the direction of the explosive stress wave, and the propagation speed is smaller than that of the dynamic crack. It is also smaller than the dynamic crack propagation speed without static crack. (2) when the static crack exists, the total length of the dynamic crack propagation decreases. The crack initiation time is shortened and the propagation speed is not affected by the static crack. The stress intensity factor of the crack is larger than that of the two ends of the static crack. (3) with the increase of the horizontal angle of the static crack, the deflection distance of the dynamic crack along the horizontal direction increases when the static crack passes through, the reverse propagation of the static crack and the dynamic crack "bite" each other, and the crack propagation displacement and velocity increase at the C end.
【作者單位】： 中國礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;中國礦業(yè)大學(xué)(北京)深部巖土力學(xué)與地下工程重點(diǎn)實驗室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2016YFC0600903) 高等學(xué)校學(xué)科創(chuàng)新引智計劃項目(B14006)
【分類號】：O346.1

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