局部腐蚀航空铝合金损伤失效过程多尺度实验研究

项目名称： 局部腐蚀航空铝合金损伤失效过程多尺度实验研究

项目编号： No.11502285

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 宋海鹏

作者单位： 中国民航大学

项目金额： 22万元

中文摘要： 开展航空铝合金在环境-载荷协同作用下的损伤失效分析对于飞机安全运行与经济维护具有重要意义。针对局部腐蚀铝合金的损伤失效问题，目前以实验为基础的材料损伤机理与演化规律研究仍有不足。本项目拟在国家自然科学基金的支持下，开展预腐蚀铝合金损伤失效过程多尺度实验研究。结合加载装置，数字图像相关，扫描电镜及电子背散射衍射方法发展全场全过程、多尺度结合、精细定量的实验测试技术，给出宏观力学行为，细观变形损伤，微结构演化等相关联的丰富实验信息；利用建立的多尺度实验方法对不同工况下铝合金损伤失效过程进行细致的实验分析，研究材料损伤机理，讨论腐蚀形貌、加载条件、材料微结构与组分等因素对损伤演化的影响；基于实验观测与失效机理，对实验数据进行统计分析，提炼损伤相关力学参量，定量表征损伤演化过程。通过实验研究，增进对力学-腐蚀耦合作用下航空铝合金损伤失效基本规律的认识。

中文关键词： 局部腐蚀；损伤演化；失效分析；多尺度实验研究；数字图像相关

英文摘要： The damage and failure analysis of aerospace aluminum alloys considering the coupled effect of mechanics and environment is significant to the safe operation and economic maintenance of aircraft. The experimental research on the failure mechanism and damage evolution of aerospace aluminum alloys with localized corrosion is still insufficient. This project intends to, under the support of the national natural science foundation, carry out a multi-scale experimental investigation on the damage and failure process of pre-corrosion aerospace aluminum alloys. A multi-scale experimental method which can provide full-field measurements and quantitative analysis is developed through the combined use of test machine, digital image correlation, scanning electron microscope and electron back scattering diffraction method. The damage evolution and crack development of aluminum alloys under different loading conditions are observed by the presented experimental method. The influences of corrosion morphology, loading condition and material microstructure on the damage evolution and failure mechanism are discussed. Based on the statistical analysis of experimental data, key mechanical parameters are identified to characterize the damage evolution。 The experimental work help to gain a better understanding of the damage and failure mechanism of aerospace aluminum alloys under loading-corrosion condition.

英文关键词： localized corrosion;damage evolution;failure analysis;multi-scale experimental investigation;digital image correlation