摘要
基于吸能防冲的理念,设计了一种由玻璃纤维复合材料(glass fiber reinforced polymer, GFRP)顶底板和三角锥点阵夹芯层(芯杆为LY160低屈服点钢)组成的复合夹芯组合板,它可与金属支架结合形成两级吸能防冲支护体系。测试并获得了GFRP和LY160低屈服点钢在准静态以及动态试验条件下的抗拉强度等基本力学参数,拟合得到了LY160低屈服点钢的C-S(Couper-Symonds)动态本构模型参数。开展了复合夹芯组合板的准静态平压试验,进行了夹芯板抗冲击性能的有限元参数分析。结果表明,随着芯杆直径的增加,试件单位体积吸收的能量显著增加,芯杆直径为6 mm试件吸收能量是直径为4 mm试件的6.0倍,单位质量吸收的能量也有所提升,但芯杆直径超过6 mm后变化不明显。当冲击地压震级为3级时,芯杆直径与单胞宽度对夹芯板结构的能量吸收率和单位质量吸收能量值影响显著,当芯杆直径为6 mm时,能量吸收率可达90%以上,而当单胞宽度为140 mm时,夹芯板兼顾吸能效率和经济性。
Here,based on concepts of energy absorption and anti-impact,a composite sandwich plate structure consisting of glass fiber reinforced polymer(GFRP)top and bottom plates and triangular cone lattice sandwich layer with LY160 low yield point steel as core rod was designed.It could be combined with a metal supporting structure to form a two-stage energy absorption and anti-impact support system.Basic mechanical parameters of tensile strengths,etc.of GFRP and LY160 steel under quasi-static and dynamic test conditions were tested and obtained,Couper-Symonds(C-S)dynamic constitutive model parameters of LY160 steel were obtained through fitting.Quasi-static flat compression tests for composite sandwich plate structure were conducted and finite element parametric analyses for their anti-impact performance were performed.The results showed that with increase in core rod diameter,energy absorbed by per unit volume of specimens significantly increases;energy absorbed by specimens with core rod diameter of 6 mm is 6.0 times that by specimens with core rod diameter of 4 mm,and energy absorbed by per unit mass also increases,but change is not obvious after core rod diameter exceeding 6 mm;when impact ground pressure magnitude is level 3,core rod diameter and unit cell width have a significant impact on energy absorption rate and unit mass absorption energy value of the sandwich plate structure;when core rod diameter is 6 mm,energy absorption rate can reach over 90%,while when unit cell width is 140 mm,the sandwich plate structure can consider both energy absorption efficiency and cost-effectiveness.
作者
吴丽丽
李金鹏
武雨祺
郑贺崇
WU Lili;LI Jinpeng;WU Yuqi;ZHENG Hechong(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第17期1-11,18,共12页
Journal of Vibration and Shock
基金
国家自然科学基金项目(52178177)
中国矿业大学(北京)越崎杰出学者奖励计划项目(2602021RC59)。
关键词
冲击地压
复合夹芯结构
平压试验
吸能构件
rock burst
composite sandwich structure
flat compression tests
energy-absorbing components
