發(fā)布時間：2019-01-14 16:12

【摘要】：金屬磁記憶是一種可對鐵磁材料早期微觀損傷進行有效診斷的無損檢測技術(shù)。為消除磁記憶信號不確定影響因素,提高損傷狀態(tài)識別的準(zhǔn)確率,引入了磁梯度張量和磁場垂向特征分析方法。首先,利用磁梯度張量測量方法獲取磁場完整的變化信息,為克服檢測方向選取對檢測信號的影響,利用磁場不變特征量-總梯度模量來判斷損傷及損傷區(qū)的邊界位置;然后,通過測量不同高度下總梯度模量的平面分布,得到總梯度模量的垂向分布特征;最后,分析了不同損傷的邊界處總梯度模量的垂向分布特征差異。理論分析和實驗結(jié)果表明,在提離高度逐漸增大過程中,裂紋邊界處的磁梯度張量振幅的衰減速度和幅度遠(yuǎn)大于應(yīng)力集中作用的結(jié)果,根據(jù)磁記憶信號的垂向特征,可有效地識別損傷狀態(tài)。
[Abstract]:Metal magnetic memory is a kind of nondestructive detection technique which can effectively diagnose the early microscopic damage of ferromagnetic materials. In order to eliminate the uncertain factors of magnetic memory signal and improve the accuracy of damage state identification, the magnetic gradient Zhang Liang and the vertical characteristic analysis method of magnetic field were introduced. Firstly, using the magnetic gradient Zhang Liang measurement method to obtain the complete change information of the magnetic field. In order to overcome the influence of the selection of the detection direction on the detection signal, the invariant characteristic quantity of the magnetic field-the total gradient modulus is used to judge the damage and the boundary position of the damage zone. Then, by measuring the plane distribution of the total gradient modulus at different heights, the vertical distribution characteristics of the total gradient modulus are obtained. Finally, the vertical distribution characteristics of the total gradient modulus at different damage boundaries are analyzed. The theoretical analysis and experimental results show that the attenuation velocity and amplitude of the magnetic gradient Zhang Liang amplitude at the crack boundary is much larger than that of the stress concentration in the process of increasing the lift height, according to the vertical characteristics of the magnetic memory signal. The damage state can be effectively identified.
【作者單位】： 軍械工程學(xué)院無人機工程系;
【基金】：河北省自然科學(xué)基金(E2015506004)項目資助
【分類號】：TG115.284

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本文編號：2408868