本文選題：巴西圓盤 + 劈裂��； 參考：《固體力學(xué)學(xué)報》2017年06期

【摘要】：采用近場動力學(xué)方法對巴西圓盤劈裂破壞問題進(jìn)行建模分析.在非局部鍵型近場動力學(xué)(Peridynamics,PD)理論基礎(chǔ)上,通過引入物質(zhì)點對的轉(zhuǎn)動自由度構(gòu)建雙參數(shù)微觀彈脆性近場動力學(xué)本構(gòu)模型以突破常規(guī)模型的應(yīng)用范圍限制,并考慮巖石混凝土類固體材料的宏觀拉壓異性和斷裂特征.引入動態(tài)松弛、粒子系統(tǒng)力邊界條件和平衡收斂準(zhǔn)則等算法,構(gòu)建了完備的PD求解體系.實現(xiàn)了含不同傾角中心裂紋巴西圓盤受壓劈裂破壞全過程的近場動力學(xué)數(shù)值模擬,裂紋擴(kuò)展路徑及破壞形式均與試驗結(jié)果高度吻合.進(jìn)一步分析了初始中心裂紋傾角及其相對長度對巴西圓盤破壞荷載的影響.
[Abstract]:A near-field dynamic method is used to model and analyze the splitting failure of Brazilian disc. On the basis of the theory of nonlocal bond type near-field dynamics, a two-parameter micro-elastic-brittle near-field dynamic constitutive model is constructed by introducing the rotational degrees of freedom of point pairs of matter in order to break through the application limits of the conventional model. The macroscopic tensile and compressive characteristics and fracture characteristics of rock concrete solid materials are considered. A complete PD solution system is constructed by introducing dynamic relaxation, particle system force boundary conditions and equilibrium convergence criteria. The near field dynamic numerical simulation of the whole process of fracture of Brazilian disk with different dip angle crack under compression is carried out. The crack propagation path and failure form are in good agreement with the experimental results. The influence of the initial central crack inclination and its relative length on the failure load of Brazilian disc is further analyzed.
【作者單位】： 河海大學(xué)工程力學(xué)系;
【基金】：國家自然科學(xué)基金(11132003,51679077和51209079) 中央高校基本科研業(yè)務(wù)費(2015B18314) “NSFC-廣東聯(lián)合基金(第二期)超級計算科學(xué)應(yīng)用研究專項” 國家超級計算廣州中心資助
【分類號】：TU45
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本文編號：1886673