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| 1 | 含弹性基础压电功能梯度圆柱壳的振动分析显示文摘为分析多物理场下含双参数弹性基础压电功能梯度圆柱壳的自由振动特性,以含Pasternak-Winkler弹性基础压电功能梯度圆柱壳为对象,采用1阶剪切变形理论和Hamilton变分原理推导多场作用下含弹性基础压电功能梯度圆柱壳的模态频率方程,讨论弹性基础参数、温度梯度、压电层的材料种类和功能梯度层的材料组分等对模态频率的影响。结果表明,模态频率随温度梯度的增大而减小,随陶瓷体积分数指数和弹性基础参数的增大而增大;选用BaTiO时,圆柱壳的模态频率以及对温度梯度的敏感性均最大,而受外激励电压的影响最小;相较于外激励电压,温度梯度对模态频率影响较大。 | 吕志鹏 刘文光 刘超 张宇航 | 2022 | 噪声与振动控制2022，42，5： | 0 |
| 2 | Predicting the electromechanical properties of small caliber projectile impact igniter using PZT dynamic damage constitutive model considering crack propagation显示文摘Block piezoelectric ceramics(PZTs)are often used in impact igniters to provide activation energy for electric initiators.Under the action of strong impact stress,PZTs release electric energy accompanied by crack initiation,propagation and crushing.At present,the electrical output performance of PZTs in projectile is usually calculated by quasi-static piezoelectric equation without considering the dynamic effect caused by strong impact and the influence of crack propagation on material properties.So the ignition parameters are always not accurately predicted.To tackle this,a PZT dynamic damage constitutive model considering crack propagation is established based on the dynamic impact test and the crack propagation theory of brittle materials.The model is then embedded into the ABAQUS subroutine and used to simulate the electromechanical response of the impact igniter during the impact of a small caliber projectile on the target.Meanwhile,the experiments of projectile with impact igniter impact on the target are carried out.The comparison between experimental and numerical simulation results show that the established dynamic damage model can effectively predict the dynamic electromechanical response of PZTs in the missile service environment. | Rui-zhi Wang Zhi-qiang Wang En-ling Tang Lei Li Guo-lai Yang Chun Cheng Li-ping He Ya-fei Han | 2023 | Defence Technology(防务技术)2023，28，10： | 0 |
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