夹芯复合材料T型接头制备工艺及力学性能试验研究  

Processing Method and Experimental Investigation on the Mechanical Properties for Composite Sandwich T-Joints

作　　者：陈亮[1] 杨坤[2] 

机构地区：[1]海军驻上海江南造船(集团)有限责任公司军事代表室，上海200011 [2]海军工程大学舰船工程系，湖北 武汉430033

出　　处：《中国舰船研究》2014年第4期70-75,共6页Chinese Journal of Ship Research

摘　　要：针对复合材料夹芯板结构非平面内连接要求,提出一种夹芯复合材料T型接头结构形式及其真空辅助成型制备方法。针对T型接头弯曲试件和剪切试件,分别开展三点弯曲试验和剪切试验,分析该型接头制备工艺稳定性、极限承载能力和破坏模式。研究结果表明:T型接头所采用的制备工艺稳定性较好;该接头弯曲刚度为1.44 kN/mm,极限弯矩达到1.15 kN·m;剪切刚度为230 N/mm,极限抗剪弯矩高于348 N·m。结构主要破坏模式:1)弯曲试件:梯形过渡区拐角处出现初始损伤,接头强度失效模式为梯形过渡区复合材料表层与填充芯材界面剥离;2)剪切试件:楔形搭接区端部初始剥离,继而45°增强层与夹芯板条界面剥离,最后,梯形过渡区复合材料表层与45°增强层和填充芯材之间界面剥离,结构崩溃破坏。Aiming at the connection between non-plan composite sandwich plates,the configuration of a new composite sandwich T-joint and the corresponding vacuum assisted forming method are propounded. The three-point bending and shear test of the T-joint bending and shear specimens are carried out sepa-rately,and the fabricating process stability,limit capability,and failure modes are analysed. The results validates the stability of the fabricating process, where the bending stiffness and limit bending moment reach 1.44 kN/mm and 1.15 kN·m,respectively, and the shear stiffness and limit anti-shear bending mo-ment reach 230 N/mm and 348 N·m,respectively. The main failure modes include：1）Bending specimen：the initial damage appears at the corner of the trapezoidal transition zone, the interface delamination be-tween outer layer and filler of the transition zone, which represents the strength failure of the joint;2）Shear specimen：the interface delamination initially appears at the end of the cuniform lap zone and then moves to the region between the 45° enhance layer and sandwich batten;finally, the interface delamination between of the transition zone composite layer and filler emerges, while the delamination simultaneity appears at the interface between the 45°; enhance layer and its filler, which causes the structure to collapse at last.

关 键 词：夹芯复合材料 T型接头 力学性能 破坏模式 

分 类 号：U663.99[交通运输工程—船舶及航道工程]