Micro Mechanical Model of Filament Wound Composite Pipe With Damage Analysis

Abstract

Filament winding (FW) is one of the most common techniques for manufacturing composite pipes. The material properties and failure mechanism of composite pipes depend largely on winding pattern. In this study a micro mechanical approach for filament wound composites (FWCs) is pursued. A diamond-shaped repeated unit cell (RUC) is first constructed which characterizes the micro architecture of FWC pipe, such as winding angel, shift between successive circuits and the area of local undulation region. The micro mechanical model is embedded into commercial FEM code of ABAQUS as user-defined subroutine thus the link between the analyses in macro engineering structural scale and in micro material structural scale is established. By averaging micro stiffness constants over the cell macro ones needed for engineering structural analysis can be obtained. On the other hand, the macro structural analysis provides average stresses/strains of the cell locating at any concerned region of the macro structure for local stress and damage analysis. Effects of tow undulation caused by tow crossover on micro stresses are taken into accounted. The model is applied to glass/epoxy wound pipes with various winding angles and winding shifts. Mechanical properties are predicted and damage evolutions are simulated. The effects of delamination damage, usually introduced by lateral low velocity impact, on stiffness and ultimate strength of FWC pipe are also investigated.

Strain Characteristic of Filament Wound Composite Cylinder under Axial Loading

“…Resistance of strain gauges is 120 Ω and sensitive factor is 2.14. As mentioned in Ref [1], there are fiber crossing regions and laminated regions in filament wound composites and fiber bands which crossed each other constructed diamond pattern, more detail of winding process are referred to Ref [1]. To obtain more information of stain field of filament wound composite, several strain gauges were stick on fiber crossing region and laminated region.…”

“…During winding process, fibers in different direction cross each other, resulting in fiber undulating [1] . There are two typical region in filament wound composite, laminate region and fiber crossing region.…”

Theoretical analysis for the axial tensile response of the mesoscopic model for filament-wound composites

“…In numerical simulation, Zhou Chuwei et al [4] established a microscopic damage model for the filament wound composites by considering the fluctuating fiber tows in the undulation's direction as a bending beam on the elastic foundation. This damage model was embedded in the macroscopic winding structures, which was built in the commercial software of ABAQUS, to predict the mechanical properties of the filament wound tube and simulate its damage evolution.…”

Comparison between elastic properties of theoretical, computational method and experimental results for filament wound composite pipes

“…Based on this literature review, it is clear that although filament wound pipes have been studied extensively, these studies differ in terms of the raw materials, fiber orientation, or nature of the polymeric matrix considered [26][27][28][29][30][31][32][33][34][35][36].…”