CAJ | 학술논문

针对复合材料力学性能分散度大、加工精度低，导致复合材料薄壁吸能因素不确定等，提出含随机不确定参数复合材料薄壁结构吸能特性评估方法。考虑材料力学性能及结构特征尺寸的不确定性，评估准静态压溃条件下薄壁圆管峰值载荷及比吸能指标。据试样级材料性能实验确定各参数分布特征；用Plackett-Burman方法选实验点，采用显式求解有限元方法分析选出对比吸能、峰值载荷影响显著的参数；建立影响显著参数及结构吸能特性指标间二阶响应面函数；据参数分布抽样计算获得吸能特性指标分布情况。结果显示，对复合材料薄壁圆管而言，纤维方向拉伸、压缩强度及圆管壁厚、基体压缩强度对其轴向压溃的比吸能及峰值载荷影响显著。
침대복합재료역학성능분산도대、가공정도저，도치복합재료박벽흡능인소불학정등，제출함수궤불학정삼수복합재료박벽결구흡능특성평고방법。고필재료역학성능급결구특정척촌적불학정성，평고준정태압궤조건하박벽원관봉치재하급비흡능지표。거시양급재료성능실험학정각삼수분포특정；용Plackett-Burman방법선실험점，채용현식구해유한원방법분석선출대비흡능、봉치재하영향현저적삼수；건립영향현저삼수급결구흡능특성지표간이계향응면함수；거삼수분포추양계산획득흡능특성지표분포정황。결과현시，대복합재료박벽원관이언，섬유방향랍신、압축강도급원관벽후、기체압축강도대기축향압궤적비흡능급봉치재하영향현저。
Duetothelargedeviationinmaterialpropertiesandinherentmachiningtolerance,uncertainfactors should be considered in designing and evaluating composite energy-absorbing structures.An evaluation method for energy-absorbing characteristics of thin-walled composite structures with uncertain parameters was proposed and developed.Thin-walled composite tubes extensively applied in automobile and aircraft engineerings are typical crushable elements for absorbing collision energy.The uncertainties due to the machining tolerance on the thickness and inner diameter of tube were considered and represented through a probability model.The indices of Triggering Specific Load(TSL)and Specific Energy Absorption (SEA ) were introduced and calculated by finite element analysis for indicating energy-absorbing characteristics of the specimen under quasi-static axial crushing.The Plackett-Burman method was used to choose measurement parameters.The response surface method was then used to build a second-order function of uncertain parameters versus TSL/SEA.The Monte Carlo method was used to obtain the probability of TSL and SEA .The results show that XC,h and XT significantly affect the SEA and XC,h and YC significantly affect the TSL.