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复合材料胶接修理是一种有效并且低成本的修理技术。本文建立了复合材料层合板双面贴补胶接修理解析分析模型。模型中考虑了搭接区阶梯末端截面积变化细节。预测失效时,层合板采用最大应变准则,胶层采用最大剪应变准则和损伤区域理论。定义了残差函数来表征极限载荷解析计算结果与试验值的接近程度。通过试验对解析模型得到的等效刚度与极限载荷进行了验证。解析分析结果与试验数据对比表明:复合材料层合板双面贴补等效刚度随着搭接长度的增加单调增加。解析模型计算的等效刚度与试验结果最大误差不超过15%。当损伤特征长度为4%时,损伤区域理论对应极限载荷残差值最小,仅为4.30%,最大剪应变准则预测极限载荷的残差值为6.41%。解析模型分析表明,双面贴补极限载荷随着搭接长度的增加表现为快速增长、缓慢增长和几乎不增长三个阶段。搭接长度结合结构减重等限制因素应选择15~35mm为宜。
Composite adhesive bonding repair is an effective and low cost repair technique. In this paper, the establishment of a composite laminate double-sided adhesive patch repair analysis and analysis model. The model takes into account the details of the cross-sectional area change at the end of the step in the overlap region. When failure is predicted, the maximum strain criterion is adopted for the laminate and the maximum shear strain criterion and damage zone theory are used for the adhesive layer. The residual function is defined to characterize the closeness of the analytical results of the limit load analysis to the experimental values. The equivalent stiffness and ultimate load of the analytical model are validated through experiments. The results of analysis and comparison with the experimental data show that the equivalent stiffness of double-sided adhesive patch increases monotonically with the increase of overlap length. Analytical model calculated equivalent stiffness and the maximum error of the test results does not exceed 15%. When the damage feature length is 4%, the theoretical limit value corresponding to the damage area is the smallest, which is only 4.30%. The maximum shear strain criterion predicts the residual value of the limit load is 6.41%. Analytical model analysis shows that the ultimate load of double-side patch increases with the lap length increases rapidly, slowly increases and almost does not increase in three stages. Length of overlap and other structural factors such as weight loss should be selected 15 ~ 35mm is appropriate.