摘要
为提高夹层结构的防爆抗冲击性能,提出一种内凹负泊松比芯层(re-entrant,RE)/聚乙烯纤维(PE)/碳化硅陶瓷(SiC)复合夹层结构.基于ABAQUS中CEL算法模拟结构在爆炸冲击下的动态响应特性,并从结构变形机制、速度响应特征以及能量吸收等角度讨论不同芯层配置顺序对结构防护性能影响.在等面密度下,引入陶瓷和聚乙烯层后结构上/下面板变形量相较RE夹层最大降低53%、5.7%.其中芯层配置为SiC-PE-RE时,层间载荷强度得以改善,下面板变形最小;随着面板支撑强度增加,面板速度逐渐减小.当SiC与PE层分别置于上/中芯层时,上/下面板峰值相较RE夹层各降低18.84%、16%且衰减速率最快.而将RE层置于上芯层会导致结构局部变形增大,使得PE层和SiC层出现局部压溃失效,导致结构吸能增量最大提升14%.
To improve blast and impact resistance of sandwich structures,this study introduces a composite sandwich structure comprising a re-entrant(RE) negative Poisson's ratio core,polyethylene(PE) fibers,and silicon carbide(SiC) ceramics.Utilizing the coupled Eulerian-Lagrangian(CEL) algorithm within ABAQUS,the dynamic response of this structure under explosive loading was simulated,assessing the impact of various core layer configurations on protective performance through structural deformation mechanisms,velocity response features,and energy absorption capacities.At equivalent areal densities,the incorporation of ceramic and polyethylene layers led to reductions in upper and lower panel deformations by up to 53% and 5.7%,respectively,relative to an RE-only sandwich layer.Notably,a core configuration of SiC-PE-RE optimized interlaminar load distribution,minimizing lower panel deformation;an increase in panel support strength correspondingly reduced panel velocities.Positioning the SiC and PE layers at the upper and middle core layers,respectively,achieved peak reductions in upper and lower panel deformations by 18.84% and 16%,compared to the RE sandwich layer,exhibiting the most rapid rate of decay.Conversely,positioning the RE layer at the upper core resulted in augmented local deformations,leading to localized crushing failures in the PE and SiC layers,thereby maximizing the energy-absorption incrementby up to 14%.
作者
罗家元
付用森
陈哲伦
李世岳
王家林
Jiayuan Luo;Yongsen Fu;Zhelun Chen;Shiyue Li;Jialin Wang(School of Electromechanical and Vehicle Engineering,ChongqingJiao tong University,Chongqing,400074)
出处
《固体力学学报》
CAS
CSCD
北大核心
2024年第5期679-693,共15页
Chinese Journal of Solid Mechanics
关键词
复合材料夹层
空中爆冲击波
动态响应
吸能特性
s composite sandwich
airburst shock wave
dynamic response
energy absorption charac-teristics
