Numerical Simulation Analysis Based On Electromagnetic Ultrasound Of Anchor Bolting System Quality Nondestructive Testing

As an effective reinforcement support method,anchor support is widely used in engineering fields.Due to its complex application environment and human factors,quality problems are not easily discovered,which may cause serious safety accidents.Therefore,how to make a quick and accurate judgment on the quality status inside the anchor system is extremely important.This paper is based on the magnetostrictive guided wave theory.Design of longitudinal guided wave transducer by FEA,and achieve anchor quality analysis.By design experiments,verify the correctness of the paper.The main contents are as follows:(1)Introduce the conversion mechanism of the magnetostrictive transducer and detection principle of longitudinal guided wave.Establish related multiphysics coupling equations and Dynamics equations.(2)Establish a 3-D FEA model of the Magnetostrictive transducer for anchoring quality testing.Optimize the excitation coil and bias magnetic field parameters in order to achieve the test requirements of anchor model.Verify the correctness of the transducer by detecting the free anchor.(3)Applying the transducer to 3-D FEA model of anchor system,improve the energy attenuation in anchor system by optimizing the cycle and frequency of excitation signal.Use optimized transducer for anchor quality detection.Achieve effective length detection and defect position judgment of anchor system,analyze the impact of corrosion and compactness on test results.(4)Using magnetostrictive guided wave detection platform,verify the effect of coil and bias magnetic field on conversion efficiency.Then use optimized transducer to detect free anchor and anchor system,experimental results show consistency with FEA model,verify the correctness of FEA model,and it can be used to guide the experiment.