Abstract
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.
Highlights
Fiber Metal Laminate (FML) composite cylinders possess superior properties of both metals and fibrous composite materials making them most suitable for oil and gas storage, transportation, high pressure working conditions etc. [1]
FML composite cylinders with 0/90 ̊, 60/30 ̊, ±45 ̊ and ±55 ̊ fiber orientation and FRP thicknesses of 1, 2 and 3 mm were subjected to external hydrostatic loading
The waviness in magnitude of Von-Mises stress was higher in FML composite cylinders with 0/90 ̊ and
Summary
Fiber Metal Laminate (FML) composite cylinders possess superior properties of both metals and fibrous composite materials making them most suitable for oil and gas storage, transportation, high pressure working conditions etc. [1]. During the manufacturing process of FML cylinders using filament winding method, residual stresses are induced in between the layers of the composite cylinder due to mismatch of the physical, mechanical and chemical properties of the matrix and reinforcement [2] [3]. These residual stresses induced by different means in the layers increase the mechanical property of the composite cylinder by increasing wear and corrosion resistance and prevent propagation of fatigue cracks [4] In certain circumstances they prove detrimental resulting in warping, undesirable distortion, fiber-matrix cracking and dimensional instability leading to premature failure [2]. Several experimental [2], analytical and numerical studies have been performed to determine the behavior of induced residual stresses in composite cylinders Experimental techniques such as layer removal method, ring slitting method, laser speckle technique, strain gauge method etc. Numerical analysis based on Lekhnitskii approach was performed for composite cylinders but using only the homogenization method [7]
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