本文選題：中心直裂紋圓盤試件　切入點(diǎn)：應(yīng)力強(qiáng)度因子　出處：《人民長(zhǎng)江》2017年20期

【摘要】：巖石斷裂韌性是巖石抵抗裂紋擴(kuò)展能力的表征,而無量綱應(yīng)力強(qiáng)度因子是計(jì)算斷裂韌性的關(guān)鍵參數(shù),目前眾多國內(nèi)外學(xué)者采用Atkinson給出的中心裂紋圓盤試件的近似公式獲取中心直裂紋圓盤的無量綱應(yīng)力強(qiáng)度因子。對(duì)Atkinson給出的無量綱應(yīng)力強(qiáng)度因子近似公式及中心裂紋圓盤試件的級(jí)數(shù)解精度進(jìn)行了研究,并給出了較廣范圍的產(chǎn)生純Ⅱ型裂紋加載條件,還采用有限元方法標(biāo)定了不同預(yù)制裂紋寬度時(shí)中心直裂紋圓盤Ⅰ型裂紋的無量綱應(yīng)力強(qiáng)度因子。分析結(jié)果表明:YⅠ隨著相對(duì)裂紋寬度增大逐漸減小,且當(dāng)相對(duì)裂紋寬度大于0.01后,YⅠ變化幅度逐漸減小;不同裂紋寬度條件下,YⅠ隨加載角變化的規(guī)律相同。當(dāng)裂紋寬度僅為0.1 mm時(shí),其無量綱應(yīng)力強(qiáng)度因子解析解與數(shù)值解會(huì)產(chǎn)生很大偏差,因此在斷裂韌性測(cè)試中應(yīng)根據(jù)實(shí)測(cè)的裂紋寬度對(duì)無量綱應(yīng)力強(qiáng)度因子進(jìn)行標(biāo)定。
[Abstract]:Rock fracture toughness is the characterization of rock resistance to crack propagation, and dimensionless stress intensity factor is the key parameter to calculate fracture toughness. At present, many scholars at home and abroad use the approximate formula given by Atkinson to obtain the dimensionless stress intensity factor of the center straight crack disc. The dimensionless stress intensity factor approximate formula and central crack given by Atkinson. The accuracy of the series solution of the specimen is studied. The loading conditions for producing pure mode 鈪，

本文編號(hào)：1669676