本文選題：近場(chǎng)動(dòng)力學(xué) + 改進(jìn)的PMB模型　； 參考：《工程力學(xué)》2016年12期

【摘要】：改進(jìn)了近場(chǎng)動(dòng)力學(xué)(peridynamics,PD)微觀彈脆性(prototype microelastic brittle,PMB)模型中微觀模量的計(jì)算方法,解決了PMB模型的"邊界效應(yīng)"問(wèn)題。利用改進(jìn)的PMB模型計(jì)算了沖擊荷載作用下單邊缺口混凝土梁的破壞全過(guò)程,得到了混合型裂紋擴(kuò)展的角度、路徑以及裂尖最大速度,并與試驗(yàn)和其他數(shù)值方法模擬結(jié)果進(jìn)行了對(duì)比分析,驗(yàn)證了改進(jìn)的PMB模型的有效性。研究結(jié)果表明,近場(chǎng)動(dòng)力學(xué)方法在模擬破壞問(wèn)題時(shí)不存在網(wǎng)格依賴性,其本構(gòu)模型自然包含了損傷與斷裂的描述,是求解結(jié)構(gòu)沖擊破壞問(wèn)題的一種有效方法。
[Abstract]:The calculation method of microscopic modulus in the prototype microelastic brittle- PMBmodel of near-field dynamics is improved, and the "boundary effect" problem of the PMB model is solved. The whole failure process of one-sided notched concrete beams under impact load is calculated by using the improved PMB model. The angle, path and maximum velocity of crack tip are obtained. The effectiveness of the improved PMB model is verified by comparing with the experimental and other numerical simulation results. The results show that the near-field dynamic method has no mesh dependence in simulating the failure problem, and its constitutive model naturally includes the description of damage and fracture, which is an effective method to solve the structural impact failure problem.
【作者單位】： 河海大學(xué)工程力學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11372099,11132003,51179064) 國(guó)家科技支撐計(jì)劃項(xiàng)目(2015BAB07B10) 江蘇省自然科學(xué)基金項(xiàng)目(BK20151493) 江蘇省高校研究生創(chuàng)新基金項(xiàng)目(KYLX_0420)
【分類號(hào)】：TU37;TU311.3

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