(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)
摘 要: 針對(duì)真空壓力浸滲制備的單向碳纖維增強(qiáng)鋁基復(fù)合材料(CF/Al復(fù)合材料)，采用細(xì)觀力學(xué)數(shù)值模擬和實(shí)驗(yàn)相結(jié)合的手段研究了其在橫向壓縮載荷下的損傷演化與斷裂力學(xué)行為，并分析了界面結(jié)合性能和纖維體積分?jǐn)?shù)對(duì)復(fù)合材料橫向壓縮力學(xué)性能的影響。結(jié)果表明：基于纖維對(duì)角正方形分布RVE建立的細(xì)觀力學(xué)有限元模型，可以較好地計(jì)算預(yù)測(cè)復(fù)合材料橫向壓縮變形力學(xué)行為。壓縮變形初期界面首先發(fā)生損傷和失效現(xiàn)象，進(jìn)而誘發(fā)界面附近基體合金的局部損傷；隨壓縮應(yīng)變?cè)黾樱缑婧突w損傷逐漸發(fā)展并導(dǎo)致纖維的失效，復(fù)合材料橫向壓縮斷口呈現(xiàn)出界面脫粘和纖維斷裂共存的微觀形貌。復(fù)合材料橫向壓縮彈性模量和極限強(qiáng)度隨著界面強(qiáng)度增大而增大，而受界面剛度的影響較小；在相同界面性能條件下，復(fù)合材料橫向壓縮極限強(qiáng)度和彈性模量均隨纖維體積分?jǐn)?shù)的增大而減小。
關(guān)鍵字: CF/Al復(fù)合材料；橫向壓縮；細(xì)觀力學(xué)；損傷演化；力學(xué)性能
（Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The unidirectional carbon fiber reinforced aluminum matrix composites (CF/Al composites) were prepared by vacuum assisted pressure infiltration method. The damage evolution and fracture mechanical behaviors of the composites under transverse compression condition were investigated by means of micromechanical numerical simulation and experimental methods. The effects of interfacial bonding properties and fiber volume fraction on the transverse compression behavior of the composites were analyzed. The results show that the micromechanical finite element model based on a diagonal square RVE can well predict the mechanical behavior of the composite under transverse compression. At the initial deformation stage, the interfacial damage and failure initiate at first, and then induce the local damage of the matrix alloy near the interface. With the increase of strain, the matrix damage accumulates gradually and leads to the local fiber failure. The microscopic fracture morphology of the composite presents the coexistence of interfacial debonding and fiber fracture. The transverse compressive elastic modulus and ultimate strength increase with the increase of interfacial strength, while the influence of interfacial stiffness is unobvious. Under the same interfacial property conditions, the ultimate compressive strength and elastic modulus of the composites decrease with the fiber volume fraction increasing.
Key words: CF/Al composites; transverse compression; micromechanics; damage evolution; mechanical property
