Numerical and Experimental Analyses of the Hoop Tensile Strength of Filament-Wound Composite Tubes
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NUMERICAL AND EXPERIMENTAL ANALYSES OF THE HOOP TENSILE STRENGTH OF FILAMENT-WOUND COMPOSITE TUBES
R. Rafiee* and F. Abbasi
Keywords: composites, pipe, finite-element modeling, progressive damage modeling, experimental study
The hoop tensile strength of a composite pipe was measured experimentally using the split-disk test method. Then, a finite-element modeling was performed to simulate the split-disk test, and the progressive damage modeling was carried out to predict the maximum load the ring specimen representing the hoop tensile strength can carry. The progressive damage modeling was utilized in the context of continuum damage mechanics, where a failed ply is replaced by a virtual continuum ply with reduced mechanical properties. To degrade the mechanical properties of the failed ply, the linear damage evolution law was used in combination with a linear material softening law. The hoop tensile strength predicted agreed with experimental observations very well, validating the finite-element modeling. The damage progression was monitored during different loading stages, and the sequence of experienced failure modes was investigated. The stress concentration factor at the root of a notch was computed based on the results of finite-element analysis. The stress distribution in the vicinity of the notch was investigated, and a simple manual method was proposed for obtaining the stress in the hoop direction. The stress obtained was compared with results of the numerical simulation, and a good accuracy of the method to determine stresses without employing the finite-element modeling was found to exist.
Composites Research Laboratory, Faculty of New Science and Technologies, University of Tehran, Tehran 1439955171 Iran * Corresponding author; e-mail: [email protected]
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 56, No. 4, pp. 631-648, July-August, 2020. Original article submitted October 16, 2019; revision submitted February 3, 2020. 0191-5665/20/5604-0423 © 2020 Springer Science+Business Media, LLC
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1. Introduction Fiber-reinforced plastic (FRP) pipes are considered as one of important elements of hard infrastructures where preventing corrosion is the main challenge. Various industrial sectors, including, but not limited to, oil, gas, petrochemical, water, and waste water ones, exploit the high-strength, high-stiffness, lightweight, smooth internal surface, and excellent corrosion resistant of FRP piping systems. These unique characteristics have rendered FRP pipelines as the main competitor of the traditional steel, asbestos, and concrete pipes in the field of construction industry. FRP pipes are required to fulfill various design requirements dictated by normative international standards [1-3]. The mechanical performance of FRP pipes are examined immediately after their production through sets of quality control tests. In addition to the visual inspection, four main aspects of pipes are monitored from the structural point of view. The soundness of an FRP pipe is inspected
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