The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decreas...The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decrease in the joint strength and the change of the failure mode from a mixed cohesive and adhesive failure with cohesive failure being dominant to adhesive failure being dominant. Careful analyses of the results reveal that the physical bond is likely responsible for the bond adhesion between L adhesive and aluminum substrates. The reduction in joint strength and the change of the failure mode resulted from the degradation in bond adhesion, which was primarily attributed to the corrosion of aluminum substrate. In addition, the elevated temperature exposure significantly accelerated the corrosion reaction of aluminum, which accelerated the degradation in joint strength.展开更多
为了研究大型变桨轴承滚道表面接触受力,首先,利用三维软件UG建立变桨轴承、叶根及轮毂三维模型,使用有限元分析软件(finite element analysis,FEA)提取各零件的刚度矩阵,通过导入Ansys中从而建立整机模型;其次,使用Link单元模拟钢球,...为了研究大型变桨轴承滚道表面接触受力,首先,利用三维软件UG建立变桨轴承、叶根及轮毂三维模型,使用有限元分析软件(finite element analysis,FEA)提取各零件的刚度矩阵,通过导入Ansys中从而建立整机模型;其次,使用Link单元模拟钢球,通过提取各模拟钢球所受到的外力得到滚道与钢球之间的压力,从而进行滚道接触分析;最后,通过载荷叠加法获取滚道的最大压力,与经典的理论计算公式进行对比,验证了该有限元模型及方法的正确性。该方法为变桨轴承的安全性和可靠性设计提供了理论基础,也为后续变桨轴承的疲劳分析及优化工作提供依据。展开更多
基金funded by General Motors Global Research and Development Center(Grant No.:PS21025708)
文摘The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decrease in the joint strength and the change of the failure mode from a mixed cohesive and adhesive failure with cohesive failure being dominant to adhesive failure being dominant. Careful analyses of the results reveal that the physical bond is likely responsible for the bond adhesion between L adhesive and aluminum substrates. The reduction in joint strength and the change of the failure mode resulted from the degradation in bond adhesion, which was primarily attributed to the corrosion of aluminum substrate. In addition, the elevated temperature exposure significantly accelerated the corrosion reaction of aluminum, which accelerated the degradation in joint strength.
文摘为了研究大型变桨轴承滚道表面接触受力,首先,利用三维软件UG建立变桨轴承、叶根及轮毂三维模型,使用有限元分析软件(finite element analysis,FEA)提取各零件的刚度矩阵,通过导入Ansys中从而建立整机模型;其次,使用Link单元模拟钢球,通过提取各模拟钢球所受到的外力得到滚道与钢球之间的压力,从而进行滚道接触分析;最后,通过载荷叠加法获取滚道的最大压力,与经典的理论计算公式进行对比,验证了该有限元模型及方法的正确性。该方法为变桨轴承的安全性和可靠性设计提供了理论基础,也为后续变桨轴承的疲劳分析及优化工作提供依据。
