本文選題：T純銅 + 大應(yīng)變拉伸　； 參考：《廣西大學(xué)學(xué)報(自然科學(xué)版)》2016年04期

【摘要】：為了測試材料在應(yīng)力三軸度接近1/3時的斷裂應(yīng)變,對9種不同厚度不同孔徑的T2純銅中心孔板試樣,在MTS試驗機上進行系列拉伸試驗。結(jié)合數(shù)值模擬和顯微觀測,確定孔板試樣的裂紋萌生位置及其應(yīng)力三軸度數(shù)值及斷裂應(yīng)變。在此基礎(chǔ)上,參照比較光滑試樣拉伸試驗,進一步探討了對材料應(yīng)力三軸狀態(tài)與斷裂應(yīng)變的關(guān)系。研究發(fā)現(xiàn):1材料斷裂應(yīng)變隨應(yīng)力三軸度減少而減少,似不服從以往基于孔洞模型研究總結(jié)出來的韌性材料斷裂規(guī)律;2孔表面實際變形很不均勻,按連續(xù)介質(zhì)力學(xué)方法估計的孔邊斷裂應(yīng)變要明顯低于其實際值。
[Abstract]:In order to measure the fracture strain of the material when the stress triaxiality is close to 1 / 3, a series of tensile tests were carried out on MTS machine for 9 samples of T2 pure copper with different thickness and pore diameter. Combined with numerical simulation and microscopic observation, the crack initiation position, stress triaxiality and fracture strain of the specimen were determined. On this basis, the relationship between the stress triaxial state and fracture strain of the material is further discussed with reference to the tensile test of the relatively smooth specimen. It is found that the fracture strain decreases with the decrease of stress triaxiality, and it seems that the fracture law of ductile material based on the pore model is very uneven, and the actual deformation of the surface of the second hole is very uneven. The fracture strain estimated by continuum mechanics method is obviously lower than its actual value.
【作者單位】： 廣西大學(xué)土木建筑工程學(xué)院工程防災(zāi)與結(jié)構(gòu)安全教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(11472085,11272094) 廣西科技開發(fā)計劃項目(1599005-2-5)
【分類號】：O346.1

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本文編號：1986208