CAJ | 학술논문

针对电磁超声技术检测铁磁材料中遇到的难题，从磁致伸缩效应的本构方程出发，讨论了在不同的磁场空间分布中，电磁超声传感器（Electromagnetic acoustic transducer，EMAT ）的磁致伸缩效应对激励声波的贡献。为避免对磁致伸缩力的探讨，提出直接从弹性质点的位移方程中提取关于磁致伸缩效应的声波激励信息，而无须再计算弹性质点所受的体力。为验证这一理论的正确性，利用 Matlab 工具仿真具体的 EMAT 结构模型，分析位移方程的时空变化曲线，得到声波信息，与相关文献中用体力描述磁致伸缩效应的声波激励信息吻合，从而证明了这一理论的可行性。
침대전자초성기술검측철자재료중우도적난제，종자치신축효응적본구방정출발，토론료재불동적자장공간분포중，전자초성전감기（Electromagnetic acoustic transducer，EMAT ）적자치신축효응대격려성파적공헌。위피면대자치신축력적탐토，제출직접종탄성질점적위이방정중제취관우자치신축효응적성파격려신식，이무수재계산탄성질점소수적체력。위험증저일이론적정학성，이용 Matlab 공구방진구체적 EMAT 결구모형，분석위이방정적시공변화곡선，득도성파신식，여상관문헌중용체력묘술자치신축효응적성파격려신식문합，종이증명료저일이론적가행성。
In view of the electromagnetic ultrasonic testing technology problems encountered in ferromagnetic materials,the paper studies the contribution of magnetostrictive effect on exciting acoustic field according to the constitutive equation of the magnetostrictive effect.In order to avoid the discussion of magnetostrictive force,the process of exciting acoustic field based on magnetostrictive effect is directly analyzed from the elastic displacement equation,which makes it unnecessary to calculate the body force of elastic particles.A specific EMAT structure model is simulated in Matlab to verify the correctness of the theory.The simulation analyzes the time-space curves of displacement equation to calculate the acoustic filed.The results match with those got by describing magnetostrictive effect with magnetostrictive force on related papers,which verifies the feasibility of the theory proposed.