【摘要】：采用落錘沖擊加載的方式,結(jié)合焦散線方法,研究了裂紋缺陷對(duì)有機(jī)玻璃(PMMA)板條試件動(dòng)態(tài)斷裂行為的影響效應(yīng)。通過對(duì)試件斷裂破壞過程的觀測和分析,得到了裂紋尖端動(dòng)態(tài)應(yīng)力強(qiáng)度因子和裂紋擴(kuò)展速度的變化規(guī)律。結(jié)果表明,該試驗(yàn)加載條件下,結(jié)構(gòu)的斷裂韌度約為1.00 MN/m~(3/2);裂紋缺陷的存在對(duì)運(yùn)動(dòng)裂紋擴(kuò)展的總體效果是抑制的,含裂紋缺陷試件中運(yùn)動(dòng)裂紋的擴(kuò)展時(shí)間約為不含裂紋缺陷的1.5倍;隨著裂紋缺陷長度的增加,運(yùn)動(dòng)裂紋在缺陷處再次起裂更為困難。
[Abstract]:The effect of crack defects on the dynamic fracture behavior of plexiglass (PMMA) lath specimens was studied by means of drop hammer impact loading and caustic line method. Through the observation and analysis of the fracture failure process of the specimen, the dynamic stress intensity factor and the crack propagation velocity at the crack tip are obtained. The results show that the fracture toughness of the structure is about 1.00 MN/m~ (3 鈮，

本文編號(hào)：2509853