异质材料粘接界面强度——三维应力奇异性影响  

Effect of Three-Dimensional Stress Singularity of Interfacial Strength of Bonded Joints

作　　者：华亚俊 吴志学[1] 田帅[1] 顾乡[1] 

机构地区：[1]扬州大学机械工程学院,江苏扬州225127

出　　处：《力学季刊》2014年第4期589-594,共6页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51075354)

摘　　要：通过实验并结合有限元分析研究了三维应力奇异性对异质材料粘接接头界面强度的影响.有限元分析结果表明:如果对三维双材料结构的棱边进行圆弧倒角,使相应的界面端线变成光滑连续曲线,则原界面端点附近的三维应力奇异性会退化为界面端线附近的二维应力奇异性,进而降低应力奇异性程度.设计了一系列有圆弧倒角与无圆弧倒角的聚甲基丙烯酸甲酯(PMMA)/铝(AL)和聚碳酸酯(PC)/铝(AL)双材料试样并进行了四点弯曲实验.实验结果表明:界面尺寸对试样失效载荷无明显影响;与未圆弧倒角的试样相比,有圆弧倒角试样的失效载荷明显得到提高.这一结果证明三维应力奇异性对粘接界面强度有明显影响.An integrated experimental and finite element analysis was employed to investigate the influence of three-dimensional stress singularity on interfacial strength of bi-material bonded joints. The results obtained through finite element analysis show that the three-dimensional stress singularities at interface comers will be reduced to the level of the two-dimensional ones if the interface edges become continuous by generating a circular-arc fillet at the intersection of the two free side surfaces and thus, the degree of stress singularities can be reduced. A series of aluminum/PMMA and aluminum/polycarbonate bi-material bonded specimens, both with and without circular-arc fillet were designed and four-point flexure experiments were conducted. The experimental results show that interface dimensions have no distinct effects on the interfacial strength, and the strength of the bonded specimens with a circular-arc fillet design can be increased which suggest the significant effect of three-dimensional stress singularities on interracial strength of bi-material bonded joints.

关 键 词：应力奇异性 材料组合 倒角 界面强度 有限元法 

分 类 号：O348[理学—固体力学]