摘要
Automotive suspension control arm is used to join the steering knuckle to the vehicle frame. Its main function is to provide stability under fatigue stresses of loading and unloading in accelerating and braking. Conventionally, these parts were made of steel; however, fuel consumption and emission of polluting gases are strongly dependent on car weight. Recently, there is a try to develop and design much lighter and better fatigue resistant metal of semisolid A357 aluminum alloys. This work aims at a better understanding of identifying the fatigue strain-hardening parameters used for determining fatigue characteristics of aluminum suspension control arm using analytical and mathematical modeling. The most judicious method is to perform the fatigue tests on standardized test pieces and then plot two Wohler curves, mainly number of cycles as a function of the stress and as a function of the deformation. From these curves and following a certain mathematical and analytical methods, certain curves are plotted and then all of these coefficients are drawn. The new calculated parameters showed a clear improvement of the fatigue curve towards the experimental curve performed on the samples of aluminum alloy A357 compared with the same analytical curve for the same alloy.
汽车悬架控制臂被用来连接转向节和车架,其主要功能是在加速和制动的装载和脱载的疲劳应力作用下提供稳定性。一般情况下,这些零件采用钢材制备,导致油耗量和污染气体排放量增加。最近,有研究尝试研发更轻、更耐疲劳的半固态A357铝合金以取代钢质悬架控制臂。本研究旨在更好地理解运用数学模拟识别疲劳应变强化参数,以便确定铝合金悬架控制臂的疲劳特性。最佳的方法是对标准试样进行疲劳测试,然后以循环次数分别作为应力和变形的函数,绘制两条Wohler曲线。利用这些曲线和特定的数学分析方法,可以得到所有的参数。计算出的新参数表明,与同一合金的相同分析曲线相比,A357铝合金样品的实验疲劳曲线明显改善。
