含脱胶缺陷复合材料L形接头拉脱强度实验研究

为考察脱胶缺陷对整体化结构在面外拉伸载荷下承载能力的影响, 实验研究了脱胶形状、间距、位置和尺寸对L形接头拉脱强度的影响规律, 定量评估了脱胶对L形接头拉脱强度的影响程度, 提出了脱胶缺陷对L形接头拉脱强度影响的定量表征参数。结果表明, L形接头的拉脱强度对脱胶形状、脱胶间距的变化不敏感, 对脱胶位置和脱胶尺寸的变化较为敏感; 位于填充区所在胶接面区域的脱胶对L形接头拉脱强度影响最大; 随着脱胶尺寸特别是填充区所在胶接面脱胶尺寸的增大, 拉脱强度显著降低。

Experimental research on tensile strength of composite L-joints with debonding defects

To investigate the influence of debondings on the bearing capacity of integral composite structures under pull-off load condition, the influence of debonding shape, debongding space, debonding location and debonding size on the tensile strength of composite L-joints was investigated with a quantitative evaluation of the influence. An important characterization parameter about the influence of debonding was proposed. The results indicate that the tensile strength of L-joints shows little sensitive change for debonding shape and debonding space. But an obvious influence of debonding location and debonding size on the tensile strength of L-joints is found, especially debonding close to the stiffener core/skin interface has the most significantly influence on the tensile strength of L-joints. The tensile strength decreases with debonding size increasing, especially with debonding size in the stiffener core/skin interface increasing.