The aim of the research work was to numerically investigate the residual stresses induced between the layers of fiber metal laminate (FML) cylinder (glass/epoxy reinforced aluminum laminates) under buckling hydrostati...The aim of the research work was to numerically investigate the residual stresses induced between the layers of fiber metal laminate (FML) cylinder (glass/epoxy reinforced aluminum laminates) under buckling hydrostatic loading. For the analysis of buckling behavior of FML cylinders, various fiber orientations such as 0/90°, 60/30°, ±45° and ±55° and different FRP thickness of 1, 2, and 3 mm were considered. The aluminum cylinder of inner diameter 80 mm, length 800 mm and wall thickness 1 mm was modeled with SHELL281 element type and a total of 1033 elements were used for computing the induced residual stresses between the layers. The results show that magnitude of residual stresses between the layers decreased along the thickness from outer layer towards the inner layer in sine wave form. The maximum residual Von-Mises stress was at inner aluminum layer while the maximum residual radial stress was at the outermost layer of FML cylinder due to the inward pressure. Among all types of FML cylinder 0/90° fiber oriented FML cylinder exhibited the least radial stress and a maximum Von-Mises stress along the FRP thickness.展开更多
纤维金属层板(Fiber Metal Laminates,FMLs)传统成形方法难以成形复杂曲面构件,限制了其在汽车行业的应用。为提高FMLs成形能力,提出了一种直接采用模具加热预堆叠层板的热态气胀成形方法。首先通过力学性能试验探究了热塑性FMLs中材料...纤维金属层板(Fiber Metal Laminates,FMLs)传统成形方法难以成形复杂曲面构件,限制了其在汽车行业的应用。为提高FMLs成形能力,提出了一种直接采用模具加热预堆叠层板的热态气胀成形方法。首先通过力学性能试验探究了热塑性FMLs中材料铺层参数对力学性能影响,随后结合试验和仿真探究了热态气胀成形方法制备FMLs曲率构件过程中工艺参数对成形效果的影响,研究显示纤维参数决定了FMLs损伤容限,PA6树脂基FMLs成形工艺温度窗口为230~250℃,成形所需最低压强为3 MPa。研究结果表明利用热态气胀成形方法可成功制备热塑性FMLs曲率构件,温度和压强是决定成形效果的关键因素。展开更多
文摘The aim of the research work was to numerically investigate the residual stresses induced between the layers of fiber metal laminate (FML) cylinder (glass/epoxy reinforced aluminum laminates) under buckling hydrostatic loading. For the analysis of buckling behavior of FML cylinders, various fiber orientations such as 0/90°, 60/30°, ±45° and ±55° and different FRP thickness of 1, 2, and 3 mm were considered. The aluminum cylinder of inner diameter 80 mm, length 800 mm and wall thickness 1 mm was modeled with SHELL281 element type and a total of 1033 elements were used for computing the induced residual stresses between the layers. The results show that magnitude of residual stresses between the layers decreased along the thickness from outer layer towards the inner layer in sine wave form. The maximum residual Von-Mises stress was at inner aluminum layer while the maximum residual radial stress was at the outermost layer of FML cylinder due to the inward pressure. Among all types of FML cylinder 0/90° fiber oriented FML cylinder exhibited the least radial stress and a maximum Von-Mises stress along the FRP thickness.
文摘纤维金属层板(Fiber Metal Laminates,FMLs)传统成形方法难以成形复杂曲面构件,限制了其在汽车行业的应用。为提高FMLs成形能力,提出了一种直接采用模具加热预堆叠层板的热态气胀成形方法。首先通过力学性能试验探究了热塑性FMLs中材料铺层参数对力学性能影响,随后结合试验和仿真探究了热态气胀成形方法制备FMLs曲率构件过程中工艺参数对成形效果的影响,研究显示纤维参数决定了FMLs损伤容限,PA6树脂基FMLs成形工艺温度窗口为230~250℃,成形所需最低压强为3 MPa。研究结果表明利用热态气胀成形方法可成功制备热塑性FMLs曲率构件,温度和压强是决定成形效果的关键因素。
