As an important magnetic functional material, sintered NdFeB has gradually applied from mild places to environments that need to withstand impact. The reliability of materials to work in this environment has received extensive attention, but current research cannot provide corresponding support of experimental data and theoretical model for this problem yet. To tackle this, we carried out research on the magnetomechanical behavior of sintered NdFeB under dynamic impact environment. Specifically, dynamic mechanics and impact demagnetization experiments were conducted separately. Then, according to the characteristics of brittleness and strain rate dependence shown in dynamic mechanical experiments, a dynamic damage constitutive model was established. Additionally, a new magnetic degradation model was proposed in which the stress knee position existed and the relationship between impact load and irreversibility was established. The co-simulation model of impact demagnetization based on dynamic mechanical constitutive model and magnetic degradation model was designed to better display the demagnetization process of materials. Meanwhile, the parameter identification process was carried out to determine the unknown parameters in the model. Finally, the effectiveness of identified parameters were verified by comparing the simulation values with the experimental values.

烧结钕铁硼作为一种重要的磁性功能材料，已逐渐从温和的场所应用到需要承受冲击的环境中。材料在这种环境下工作的可靠性受到了广泛关注，但目前的研究还不能为该问题提供相应的实验数据和理论模型支持。为此，我们开展了烧结钕铁硼在动态冲击环境下的磁力学行为研究。具体而言，分别进行了动态力学和冲击退磁实验。然后，根据动态力学实验中表现出的脆性和应变率依赖性的特点，建立了动态​​损伤本构模型。此外，提出了一种新的磁退化模型，其中存在应力膝点位置，并建立了冲击载荷与不可逆性之间的关系。设计了基于动态力学本构模型和磁退化模型的冲击退磁联合仿真模型，以更好地展示材料的退磁过程。同时，进行参数辨识过程，确定模型中的未知参数。最后，通过仿真值与实验值的对比，验证了辨识参数的有效性。设计了基于动态力学本构模型和磁退化模型的冲击退磁联合仿真模型，以更好地展示材料的退磁过程。同时，进行参数辨识过程，确定模型中的未知参数。最后，通过仿真值与实验值的对比，验证了辨识参数的有效性。设计了基于动态力学本构模型和磁退化模型的冲击退磁联合仿真模型，以更好地展示材料的退磁过程。同时，进行参数辨识过程，确定模型中的未知参数。最后，通过仿真值与实验值的对比，验证了辨识参数的有效性。