华南理工大学学报（自然科学版）
華南理工大學學報（自然科學版）
화남리공대학학보（자연과학판）
JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE EDITION)
2014年
9期
102-106,146
,共6页
薄壁结构%平均压溃力%截面形状%材料力学性能%计算机仿真%计算
薄壁結構%平均壓潰力%截麵形狀%材料力學性能%計算機倣真%計算
박벽결구%평균압궤력%절면형상%재료역학성능%계산궤방진%계산
thin-walled structures%mean crush force%section shape%mechanical properties of material%computer simulation%calculations
纵梁的平均压溃力决定着轿车纵梁在碰撞过程中吸收能量的能力。研究纵梁的平均压溃力，可在概念设计阶段了解纵梁的碰撞性能，减少潜在的设计缺陷。但文献中纵梁平均压溃力的拟合结果与试验及仿真偏差较大。为此，文中采用物理试验与仿真试验相结合的方法，分析平均压溃力与材料的截面形状、厚度和力学性能的关系，并对一系列单元薄壁矩形截面梁进行试验与仿真，根据统计学中极差、最大偏差和标准差最小化原则，推导出新的矩形截面梁平均压溃力公式。计算结果表明，所推导公式的拟合值比现有文献公式的更加接近仿真值，能够满足轿车前纵梁概念的设计需要。
縱樑的平均壓潰力決定著轎車縱樑在踫撞過程中吸收能量的能力。研究縱樑的平均壓潰力，可在概唸設計階段瞭解縱樑的踫撞性能，減少潛在的設計缺陷。但文獻中縱樑平均壓潰力的擬閤結果與試驗及倣真偏差較大。為此，文中採用物理試驗與倣真試驗相結閤的方法，分析平均壓潰力與材料的截麵形狀、厚度和力學性能的關繫，併對一繫列單元薄壁矩形截麵樑進行試驗與倣真，根據統計學中極差、最大偏差和標準差最小化原則，推導齣新的矩形截麵樑平均壓潰力公式。計算結果錶明，所推導公式的擬閤值比現有文獻公式的更加接近倣真值，能夠滿足轎車前縱樑概唸的設計需要。
종량적평균압궤력결정착교차종량재팽당과정중흡수능량적능력。연구종량적평균압궤력，가재개념설계계단료해종량적팽당성능，감소잠재적설계결함。단문헌중종량평균압궤력적의합결과여시험급방진편차교대。위차，문중채용물리시험여방진시험상결합적방법，분석평균압궤력여재료적절면형상、후도화역학성능적관계，병대일계렬단원박벽구형절면량진행시험여방진，근거통계학중겁차、최대편차화표준차최소화원칙，추도출신적구형절면량평균압궤력공식。계산결과표명，소추도공식적의합치비현유문헌공식적경가접근방진치，능구만족교차전종량개념적설계수요。
The energy absorption ability of a car rail during crash depends on the mean crush force of the rail.The mean crush force research helps to know the rail impact performance and reduce the potential defect at concept design stage.However,as for the mean crush force,there is a considerable discrepancy among tests,simulations and fitting results in literatures.In order to solve this problem,this paper analyzes the relationships between the mean crush force and such parameters as the beam shape,beam thickness and mechanical properties of material by combining physical tests with simulations.Then,a series of single-cell thin-walled rectangle section beams are employed to carry out tests and simulations,and a new formula of mean crush force is deduced for the beams on the basis of minimization principle of range,maximum deviation and standard deviation.The calculation results show that the deduced formula achieves a fitting value which is closer to the simulation value than that in literatures,and it can meet the concept design requirement of frontal rail.
