摘要
针对汽车前纵梁的耐撞性要求,分析了薄壁直梁的耐撞性评价指标,运用非线性有限元理论建立了方形管、圆形管、圆锥管、方锥管4种不同结构薄壁直梁的有限元模型,研究了这几种薄壁直梁结构在轴向冲击载荷下的能量吸收与变形特性,并对不同结构薄壁直梁的耐撞性能进行了对比。结果表明,锥形结构薄壁梁的耐撞性能优于直筒型结构,圆形截面结构薄壁梁的耐撞性能优于方形截面结构。对圆锥形结构直梁的进一步研究发现,当圆锥管的锥角在4.3°附近时,材料可以更好地发挥缓冲撞击的效率。
According to the crashworthiness requirement of vehicle frontal rail, the crashworthiness factors of thinwalled straight beam were analyzed. The finite element models of thin-walled straight beam with different shapes, including square tube, circular tube, taper tube and frusta tube, were set up based on nonlinear finite element theory. Energy-absorbing and deformation characteristics of the above beams subject to axial impacting loads, were studied. The crashworthiness of thin-walled straight beams with different shapes was compared with each other. Research results show that the crashworthiness of taper beam structure is superior to that of uniform beam structure, while the crashworthiness of circular section is better than that of square section. Further study on taper beam struetures shows that material can better bear the impacting loads when the inclined angle of taper tube is near 4. 3 °.
出处
《机械科学与技术》
CSCD
北大核心
2009年第4期455-459,共5页
Mechanical Science and Technology for Aerospace Engineering
关键词
汽车
前纵梁
耐撞性
能量吸收
有限元模型
vehicle
frontal rail
crashworthiness
energy-absorbing
finite element model
