首页|TPU材料负泊松比结构缓冲性能研究

TPU材料负泊松比结构缓冲性能研究

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针对当前防弹头盔泡沫衬垫在头盔被枪弹钝击过程中吸能不足的问题,开展3D打印负泊松比结构柔性衬垫吸能特性研究.以热塑性聚氨酯(TPU,Thermoplastic polyurethanes)为原料,采用3D打印制造TPU拉伸试件和压缩试件,进行了打印工艺参数(打印速度、打印温度和分层厚度等)对柔性材料力学特性影响的研究;设计了不同尺寸规格的负泊松比结构并进行了准静态压缩试验,利用有限元仿真与试验结果进行了对比.结果表明:当打印层高为0.1 mm、喷头温度为200℃、打印速度15 mm/s时,打印试件的力学特性最优;负泊松比结构的吸能能力随着水平胞壁与弯曲胞壁的长度降低而提高,随着胞壁厚度的增加而提高,与胞壁夹角无明显规律;随后通过多目标优化设计,确定了负泊松比结构胞元的最优结构,比能量吸收相较于优化前结构得到显著增加.
Study on buffer performance of TPU material with negative Poisson's ratio structure
Aiming at the problem that the current bulletproof helmet foam pad cannot absorb enough energy when the helmet is blunt hit by a bullet,the energy absorption characteristics of 3D printed negative Poisson's ratio structure flexible pad were studied.Using thermoplastic polyurethane(TPU)as raw material,TPU tensile and compressive specimens were manufactured using 3D printing.The effects of printing process parameters(printing speed,printing temperature,and delamination thickness)on the mechanical properties of flexible materials were studied;Different sizes and specifications of negative Poisson's ratio structures were designed and quasi-static compression tests were conducted.Finally,finite element simulation and experimental results were compared.The results show that the mechanical properties of the printed specimen are optimal when the printing layer height is 0.1 mm,the nozzle temperature is 200℃,and the printing speed is 15 mm/s;The energy absorption capacity of the negative Poisson's ratio structure increases with the decrease of the length of the horizontal and curved cell walls,and increases with the increase of the cell wall thickness.There is no obvious pattern of the angle between the structure and the cell wall;Subsequently,through multi-objective optimization design,the optimal structure of the negative Poisson's ratio structural cell was determined,and the specific energy absorption was significantly increased compared to the structure before optimization.

negative Poisson's ratio structuremechanical propertiesnumerical simulation3D printingmulti-objective optimization design

沈鲁豫、温垚珂、董方栋、覃彬、徐浩然

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南京理工大学机械工程学院,南京 210094

瞬态冲击技术重点试验室,北京 102202

中国兵器工业第208 研究所,北京 102202

负泊松比结构 力学性能 数值模拟 3D打印 多目标优化设计

瞬态冲击技术重点试验室基金国家自然科学基金国防基础科研项目军委科技委基础加强计划技术领域基金

614260622110111872215JCKYS201909C0012020-JCJQ-JJ-403

2024

10.11809/bqzbgcxb2024.02.038

兵器装备工程学报
重庆市（四川省）兵工学会 重庆理工大学

兵器装备工程学报

CSTPCD北大核心
影响因子：0.478
ISSN：2096-2304
年,卷(期)：2024.45(2)
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