天然不含节竹管在轴向压缩冲击载荷下冲击响应与吸能特性的数值分析  

Numerical analysis of impact response and energy absorption characteristics of natural internode bamboo tubes under axial compression impact load

作　　者：周盈侠 缪馥星[1] 徐挺[1] 金跃 ZHOU Yingxia;MIAO Fuxing;XU Ting;JIN Yue(Key Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,315211 Ningbo,China)

机构地区：[1]宁波大学冲击与安全工程教育部重点实验室,宁波315211

出　　处：《应用力学学报》2024年第3期629-641,共13页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11872218;11572161);浙江省“近海结构冲击安全防护与健康监测”重点科技创新团队(No.2013TD21)。

摘　　要：天然不含节竹管在工程中应用较广,研究此类天然薄壁管结构的抗冲击能力具有重要的意义。利用分离式霍普金森压杆(split Hopkinson pressure bar, SHPB),研究天然竹管的抗冲击性能并进行有限元分析。在ABAQUS中应用三维Hashin和Puck单向纤维复合材料失效准则,结合应变率效应对强度的修正建立竹管本构模型,对冲击载荷下的天然不含节竹管进行模拟,得到的动态应力-应变曲线和破坏模式与SHPB实验接近,验证有限元模型的准确性。结果表明:实验与模拟的极限抗压强度误差最小为2.19%、最大为8.68%;在不同的冲击压缩载荷下,竹管出现端面压溃、沿轴向劈裂等破坏形式;竹管外壁节点处的位移、速度和加速度响应均随冲击载荷的增加而增加;随冲击载荷升高,入射能、反射能、吸收能和比吸能随时间均呈上升趋势,透射能随时间变化不大;不含节竹管的峰值载荷远低于薄壁圆管GFRP (glass fiber reinforcement plastic),但比吸能较为接近,说明不含节竹管并不适用于需承受大冲击能量的高速冲击防护领域。初步结果可为竹管用于工程结构防护给予理论参考。Natural internode bamboo tubes are commonly used in engineering,and it is of great significance to investigate the impact resistance of such natural thin-walled tube structures.The impact resistance of natural bamboo tubes was investigated,and a finite element analysis was carried out with a split Hopkinson pressure bar(SHPB).The three-dimensional Hashin and Puck unidirectional fiber composite failure criterion was applied in ABAQUS and combined with the correction of the strain rate effect on strength to establish a bamboo tube constitutive model to simulate the natural internode bamboo tubes under impact loading.The dynamic stress-strain curves and damage modes obtained were close to those obtained from the SHPB experiments,proving the accuracy of the finite element model.The results show that the experimental and simulated ultimate compressive strengths have a minimum error of 2.19 percent and a maximum error of 8.68 percent;under different impact compression loads,the bamboo tubes show end face crushing,axial splitting,and other forms of damage;displacement,velocity,and acceleration responses at the nodes of the outer wall of the bamboo tubes increase with the increase of the impact load.The incident energy,reflected energy,absorbed energy,and specific absorbed energy all increase with time,whereas the transmitted energy does not.The peak load of internode bamboo tubes is significantly lower than that of GFRP thin-walled round tubes,but the specific absorbed energy is similar,indicating that internode bamboo tubes are not suitable for high-speed impact protection fields that require large impact energy.The preliminary findings may provide some theoretical guidance for the use of bamboo tubes in engineering structural protection.

关 键 词：不含节竹管 轴向冲击 冲击响应 吸能特性 有限元分析 

分 类 号：TU366.1[建筑科学—结构工程]