Statistical Law of Dynamic Fracture Strain Distribution of 6061 Aluminum Electromagnetic Expansion Ring

The fracture strain distribution of ductile metal rings under dynamic loading has significant application value, and the electromagnetic expansion ring is a commonly used experimental loading method. However, currently there is a lack of effective in-situ observation technology in experiments, making it impossible to obtain high-precision fracture strain statistical data. In this paper, the newly developed close-packed photonic Doppler velocimetry (PDV) array testing technology was applied to the electromagnetic expanding ring experiment, and a large amount of high-confidence fracture strain experimental data were obtained. The statistical distribution of material yield strength was obtained through hardness measurements, a probabilistic constitutive model was established, and large-scale computations were carried out to obtain a wealth of fracture strain simulation results. By combining experiments with simulations, the strain rate effect of dynamic fracture strain in 6061 aluminum electromagnetic expanding ring and the rationality of the Weibull distribution assumption for fracture strain were analyzed.