摘要
为提高薄壁结构的耐撞性,基于骨单位的微观结构特性,设计具有骨单位结构特征的仿生薄壁结构。应用非线性有限元法对仿生薄壁结构的能量吸收和变形模式进行仿真分析,通过全因子试验确定耐撞性最优的仿生薄壁结构。结果表明:层数为6、最大壁厚为2.8 mm、梯度值为0.3 mm的仿生薄壁结构耐撞性最优;在0°、10°、20°、30°载荷下,仿生薄壁结构均呈现稳定的渐进折叠变形,对比普通圆管,仿生薄壁结构的质量降低了31.3%,其比吸能分别提高了3.2%、-13.7%、19.3%和10.6%,峰值压溃力分别降低了42.4%、33.3%、37.3%、44.0%。骨单位结构特征有效提高了薄壁结构的耐撞性。
In order to improve the crashworthiness of the thin-walled structure,a bionic thin-walled structure with osteon structure features was designed based on the microstructural characteristics of the osteon.The energy absorption and deformation modes of bionic thin-walled structures were simulated by nonlinear finite element method.The bionic thin-walled structure with the best crashworthiness was determined by full factor test.The results showed that the bionic thin-walled structure with 6 layers,2.8 mm maximum wall thickness and 0.3 mm gradient value had the best crashworthiness.Under 0°,10°,20°and 30°loads,it exhibited a stable progressive folding deformation:the mass of the bionic thin-walled structure was reduced by 31.3%,the specific energy absorption increased by 3.2%,-13.7%,19.3%and 10.6%respectively,while the peak crushing force decreased by 42.4%,33.3%,37.3%and 44.0%respectively as compared with the round tube.The structural characteristics of the osteon can effectively improve the crashworthiness of the thin-walled structure.
作者
范晓文
杨欣
许述财
黄晗
霍鹏
FAN Xiaowen;YANG Xin;XU Shucai;HUANG Han;HUO Peng(College of Mechanical and Electrical Engineering,Agricultural University of Hebei,Baoding 071000,China;State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)
出处
《载人航天》
CSCD
北大核心
2020年第2期142-151,共10页
Manned Spaceflight
基金
国家自然科学基金(51305223)
中国博士后科学基金(2018M641338)
河北农业大学青年科学基金(2013QNR001)。
关键词
耐撞性
薄壁结构
骨单位
仿生设计
crashworthiness
thin-walled structure
osteon
bionic design
