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本文对温度影响下应用应力波监测钛合金CT试件中的疲劳裂纹进行了研究。建立了由MTS材料试验机和温控箱组成的实验装置,模拟温度变化对应力波在钛合金试件中传播的影响。采用PZT压电元件分别在试件中激励和接收应力波信号。通过连续小波分析,提取应力波信号的多种特征用于表征疲劳裂纹的发生与发展,并对信号特征进行了统计分析。为在温度变化下监测钛合金试件中的疲劳裂纹,对信号特征进行多元偏值分析,采用马氏平方距离融合多个信号特征,在概率统计意义下确定钛合金试件中是否存在疲劳裂纹。实验结果表明了所提出方法的可行性和有效性。
In this paper, the application of stress wave monitoring of fatigue cracks in titanium alloy CT specimens under the influence of temperature was studied. An experimental device composed of MTS material testing machine and temperature control box was set up to simulate the influence of temperature change on the propagation of stress wave in the titanium alloy specimen. The PZT piezoelectric element is used to excite and receive the stress wave signal in the test piece respectively. Through continuous wavelet analysis, a variety of features extracted from stress wave signals are used to characterize the occurrence and development of fatigue cracks, and the signal characteristics are statistically analyzed. In order to monitor the fatigue crack in the titanium alloy specimen under the temperature change, the signal characteristics were analyzed by multivariate bias analysis. The signal characteristics were fused by the square distance of Markov square to determine whether the fatigue crack existed in the titanium alloy specimen . The experimental results show the feasibility and effectiveness of the proposed method.