(1. 南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌330063；
2. Center of Advanced Materials Processing and Manufacturing, The University of Queensland, St Lucia, QLD 4072, Australia)
摘 要: 針對(duì)真空壓力浸滲制備的單向碳纖維增強(qiáng)鋁合金復(fù)合材料(CF/Al復(fù)合材料)，采用細(xì)觀(guān)力學(xué)數(shù)值模擬與實(shí)驗(yàn)結(jié)合的方法研究了其橫向拉伸損傷演化和斷裂力學(xué)行為，并分析了界面對(duì)復(fù)合材料橫向拉伸力學(xué)性能的影響。結(jié)果表明，基于基體合金延性損傷和界面內(nèi)聚力損傷本構(gòu)所建立的細(xì)觀(guān)單胞有限元模型，可以實(shí)現(xiàn)CF/Al復(fù)合材料橫向拉伸彈塑性力學(xué)響應(yīng)的計(jì)算和預(yù)測(cè)。復(fù)合材料橫向拉伸時(shí)先后發(fā)生界面損傷、界面失效以及基體損傷累積與失效現(xiàn)象，界面損傷脫粘并誘發(fā)基體塑性損傷和失效是導(dǎo)致復(fù)合材料橫向斷裂的主要機(jī)理。增加界面強(qiáng)度有利于提高橫向拉伸屈服強(qiáng)度和極限強(qiáng)度，界面剛度對(duì)極限強(qiáng)度影響不大，但增加界面剛度可有效提高復(fù)合材料橫向拉伸彈性模量。
關(guān)鍵字: 鋁基復(fù)合材料；細(xì)觀(guān)力學(xué)；單胞；漸進(jìn)損傷；界面；數(shù)值模擬
（1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
2. Center of Advanced Materials Processing and Manufacturing, The University of Queensland, St Lucia, QLD 4072, Australia）
Abstract:The unidirectional graphite fiber M40J reinforced aluminum alloy composites (CF/Al composites) was fabricated by vacuum assisted pressure infiltration technology. The elastic-plastic mechanical behavior and the damage evolution behavior of composites was evaluated using micromechanics FEM and tensile testing method. According to the numerical simulation and experimental results, the influence of interface property on the mechanical properties of the campsites during transverse tensile process was also analyzed. The results show that the micromechanical representative volume element (RVE) model established can evaluate the stress-strain behavior of the composites in transverse tensile process. The occurrences of initial damage, damage accumulation and failure in the interface and matrix alloy lead to the fracture of the composites. There is an important influence of interface property on the ductile damage evolution and failure of matrix alloy, which eventually determined the transverse fracture mechanical properties of the CF/Al composites.
Key words: aluminum matrix composite; micromechanics; unit cell; progressive damage; interface; numerical simulation
