摘要
受孔雀螳螂虾前鄂抗冲击区结构启发,设计并制备了双向波纹夹芯管结构,采用实验和数值模拟相结合的方法研究了其在内爆炸载荷下的动态响应及能量吸收机制。实验获得了结构的外管中点最大挠度和3种典型变形模式:局部塑性变形、塑性大变形以及撕裂破坏。内外管中点最大挠度和结构最终变形模态的数值模拟结果与实验结果吻合较好。通过数值模拟研究了芯层波纹数、内外管壁厚以及炸药质量对外管中点最大挠度和能量吸收特性的影响,结果表明:随着波纹数增大,结构比吸能先增大后减小;增大内管壁厚和减小外管壁厚能有效地提高结构的抗爆性能,当结构内管壁厚为2.5 mm、外管壁厚为1.5 mm时,相比于内管壁厚为1.5 mm、外管壁厚为2.5 mm时,外管中点最大挠度降低了67.6%,质量降低了6.0%;随着TNT当量的增加,内管吸收的能量占比逐渐下降,而芯层和外管吸收的能量占比增加。建立了BP(back propagation)神经网络模型、PSO-BP(particle swarm optimization-back propagation)神经网络模型以及响应面分析模型,分别对结构的比吸能与外管中点最大挠度进行预测,优化了所提出的结构。
A bi-directional corrugated sandwich tube structure was proposed,inspired by the front jaw of peacock mantis shrimp.The dynamic responses and energy absorption characteristics of bi-directional corrugated sandwich tubes under inner blast loading were investigated numerically and experimentally.It was found that three typical deformation modes including localized plastic deformation,elliptical plastic large deformation and laceration.The numerical results of the mid-point deflection of the outer tube and the final deformation mode of the structure agree well with the experimental results.Subsequently,the effects of the number of corrugation of the bi-directional corrugated core tube,the inner and outer tube wall thicknesses and TNT dose on its dynamic response and energy absorption characteristics were investigated thoroughly.The results show that the energy absorption ratio of the structure increases first,and then decreases with the increase of the number of corrugation.Increasing the inner tube wall thickness and decreasing the outer tube wall thickness can improve the shock resistance performance.Compared with the inner tube wall thickness of 1.5 mm and an outer tube wall thickness of 2.5 mm,the structure with an inner tube wall thickness of 2.5 mm and an outer tube wall thickness of 1.5 mm can reduce the maximum midpoint deflection(MD)of the outer tube by 67.6%and reduce the mass by 6.0%.As the TNT dose increases,the percentage of energy absorbed by the inner tube decreases gradually,while the percentage of energy absorbed by the core and outer tube increases.Finally,the specific energy absorption(SEA)of the structure and MD of the outer tube were predicted using BP(back propagation)neural network model,PSO-BP(particle swarm optimization-back propagation)neural network model,and RSM(response surface methodology)model to optimize the proposed structure.
作者
唐波
李子豪
刘志芳
李世强
TANG Bo;LI Zihao;LIU Zhifang;LI Shiqiang(Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Shanxi Key Laboratory of Material Strength and Structural Impact,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2024年第6期134-148,共15页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(12072219,12272254)
山西省自然科学研究面上项目(202203021211170)
海安太原理工大学先进制造与智能装备产业研究院开放研发项目(2023HA-TYUTKFYF016)
山西省科技创新人才团队(领军)专项(202204051002006)
爆炸科学与安全防护全国重点实验室(北京理工大学)开放课题(KFJJ24-03M)。
关键词
夹芯管
双向波纹芯层
内爆炸载荷
抗爆性能
sandwich tube
bi-directional corrugate core
internal blast loading
blast resistance performance
