Abstract:
The distribution of fracture strain in ductile metal rings under dynamic loading is of significant value for predicting fracture and fragment distribution. Electromagnetic expansion ring devices are commonly used experimental techniques for this purpose. However, there is currently a lack of suitable in-situ observation techniques in experiments, leading to incomplete and highly erroneous fracture strain results. To address this issue, this paper presents an electromagnetic expansion ring experimental device equipped with a densely arranged PDV array, which has yielded a large amount of high-confidence fracture strain experimental data. Subsequently, using the electromagnetic and velocity information measured from the experimental samples as input conditions, a simulation model was constructed to perform batch numerical simulations and statistically analyze the fracture strain data. The comparison between experimental and simulation data has proven the reliability of obtaining fracture strain through the improved device. Finally, using the above two sets of data, the strain rate effect and Weibull distribution law of the dynamic fracture strain of 6061 aluminum electromagnetic expansion rings were analyzed from the perspectives of material homogeneity and loading strain rate.
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