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This paper employed a nonlinear constitutive relation to describe the mechanical behavior of sintered neodymium iron boron (NdFeB) and studied the dynamic damage of NdFeB in the electromagnetic buffer. The systematic research on the constitutive model of NdFeB was yet studied. To end this, a suite of dynamic tests was implemented using a Split Hopkinson Pressure Bar (SHPB) system to obtain the compressive behavior at different strain rates of NdFeB. Referred to as Zhu-Wang-Tang (ZWT), the damage-modified constitutive model used herein was fitted by the experimental data, so that a set of ZWT model parameters for the tested materials was achieved. Then the incremental expression of the constitutive model was formulated and further embedded into ABAQUS via the VUMAT subroutine interface to establish the dynamic model of the electromagnetic buffer, followed by calculated. Finally, the damage peak of NdFeB was optimized according to the interval uncertain optimization method. The detailed assessments showed that the damage peak appeared in the inner side of the right-most permanent magnet, and its value was greatly reduced after optimization.

mechanics of advanced materials and structures

Dynamic damage study of sintered NdFeB in electromagnetic buffer under intensive impact load: Experiments, numerical simulation, and interval uncertain optimization