基于机电阻抗法测量内耗的铝合金疲劳检测
Detecting fatigue in aluminum alloys based on internal friction measurement using an electromechanical impedance method
摘要：
金属构件的机械疲劳检测一直是工业中的一个挑战。在这项工作中，我们提出了监测低周疲劳的6061铝合金的内耗（IF）测量的基础上，这是实现了定量机电阻抗（Q-EMI）的方法，使用一个小的压电晶片上的试样。采用大应变幅（3.3*10^-3），因此疲劳寿命始终低于10 ^5次循环。结果表明，除初始阶段外，IF随疲劳循环次数的增加而稳定增加。在疲劳破坏前，IF值可达初始值的2.5 ~ 3.4倍，这可能是由微裂纹的形成和扩展引起的。相比之下，试样的共振频率与初始值相比仅下降不到2%。最后，提出了一个适用于所有金属材料的基于IF测量的通用疲劳判据。
英文摘要：
Detecting mechanical fatigue of metallic components is always a challenge in industries. In this work, we proposed to monitor the low-cycle fatigue of a 6061 aluminum alloy based on internal friction (IF) measurement, which is realized by a quantitative electromechanical impedance (Q-EMI) method using a small piezoelectric wafer bonded on the specimen. Large strain amplitude (3.3*10^-3) was employed thus the fatigue life can always be below 10^5 cycles. It was found that except for the initial testing stage, the IF always increases steadily with the increasing fatigue cycles. Before the fatigue failure, the IF can reach 2.5 to 3.4 times of the initial value, which is thought to be caused by the micro-cracks forming and growing. In comparison, the resonance frequency of the specimen just drops less than 2% compared with the initial value. Finally, a general fatigue criterion based on IF measurement is suggested for all the metallic materials.
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