CAJ | 학술논문

对真空辅助玻璃纤维增强复合材料斜接型挖补修理后结构进行了拉伸强度试验研究，获得了修理后结构最终破坏模式。分别建立了挖补修理结构中母板与补片三维有限元模型，采用了各向异性连续损伤力学模型模拟了母板与补片复合材料单向带失效模式，假定母板与补片通过黏性力接触，在真空辅助湿法挖补修理形成的无厚度二次固化界面处定义了接触面，采用指数型软化 cohesive 模型模拟了界面接触属性。试验结果与数值模拟结果吻合较好，表明所采用的模型能很好地预测整个修理结构的拉伸性能。分析了整个拉伸过程中层合板斜接挖补修理结构的损伤破坏过程，发现了附加补片引起的应力集中是造成母板中薄弱层过早损伤的原因。讨论了不同斜接挖补角度对修理后结构强度的影响，结论可以引导工艺人员制订合理的修补方案。
대진공보조파리섬유증강복합재료사접형알보수리후결구진행료랍신강도시험연구，획득료수리후결구최종파배모식。분별건립료알보수리결구중모판여보편삼유유한원모형，채용료각향이성련속손상역학모형모의료모판여보편복합재료단향대실효모식，가정모판여보편통과점성력접촉，재진공보조습법알보수리형성적무후도이차고화계면처정의료접촉면，채용지수형연화 cohesive 모형모의료계면접촉속성。시험결과여수치모의결과문합교호，표명소채용적모형능흔호지예측정개수리결구적랍신성능。분석료정개랍신과정중층합판사접알보수리결구적손상파배과정，발현료부가보편인기적응력집중시조성모판중박약층과조손상적원인。토론료불동사접알보각도대수리후결구강도적영향，결론가이인도공예인원제정합리적수보방안。
The tensile strength of the glass fiber composites using vacuum-assisted scarf repairs was first tested,and the final failure mode of repair structure was obtained.A three-dimensional finite element model of motherboard and patch in the repaired structure were established respectively,the material failure of unidirectional composites was simulated with continuum damage mechanics model, motherboard and patch contact with each other was assumed through the viscous force,and the contact analysis was defined for the secondary curing interface which was formulated by vacuum-assisted wet scarf repairs,the exponential softening cohesive model was used to simulate the properties of the inter-face contact.Test results and numerical simulation results agree well,so the model can be used to predict the tensile properties of the entire repaired structure.The damage and failure of the entire re-paired structure were analyzed for the whole stretching process,the weak layer premature inj ury phe-nomenon is found,which caused by the stress concentration on the motherboard due to the additional patches.The influence of scarf angles on the strength of repaired structure in different sizes were dis-cussed,the conclusion can guide technical staffs to make reasonable repair scheme.