Development And Application Of An Electromagnetic-drived Equipment For Impact Testing

Shot peening is widely employed to improve the fatigue life of the components by introducing the compressive residual stress to the surface. Since the process parameters of shot peening are generally determined by the experience, the strengthening effect can’t be guaranteed. To improve the current situation, a developed project was submitted. An electromagnetic-drived equipment used for single shot impact was designed and manufactured based on the regulation obtained by ANSFOT. The impacting experiments with single shot were carried out, and simulations based on ABAQUS were accomplished. The numerical results agree with the experiment data very well. The electromagnetic-drived equipment developed in this paper can provide solid support for the accurate quantification of process parameters of shot peening. The detailed works include:1. The launching model was developed with ANSFOT, in which the shots with two dimensions were used to analyze the influence of the factors in the straight movement. The influence factors including the circle number and length of coils, the initial position of shots, the initial voltage of capacitor and the capacitance of capacitor were investigated. The obtained appropriate parameters were used for the development of an electromagnetic-drived equipment for impact testing.2. A velometer for shot was designed and manufactured based on electromagnetic induction principle and a digital oscilloscope. The accuracy of the velometer was improved by altering the distribution of magnetic induction lines. The high agreement between simulation and the measurement data by velometer verified the feasibility of the numerical analysis with ANSFOT.3. Based on the parameters determined by ANSFOT simulation, the launcher was designed and manufactured. The electromagnetic-derived equipment consists of the launcher, the velometer, the control system and the fixture, and its function was verified by impact testing.4. The impact testing that one single shot with different velocities and impinging angles was used to shock the OFHC copper was carried on the developed electromagnetic-derived equipment. The dimple morphology was measured by Keyence microscope system. Finite element simulation of the shocked process was modeled by ABAQUS/Explicit code incorporated with a user material subroutine of OFHC(vumat). A good agreement between numerical results and experimental data was obtained.