Numerical‐experimental structural instability analysis of composite tubes considering manufacturing parameters and imperfections

Abstract

A numerical‐experimental approach to predict structural instability was developed to analyze thin composite tubes produced by filament winding subjected to external pressure. The divergence between mechanical properties characterized through standardized procedures and those of the manufactured component, influenced by imperfections and manufacturing peculiarities, was considered. A ring compression test and an inverse finite element analysis routine were used for material properties calibration. The routine was based on Tsai's master‐ply concept to deliver feasible constitutive properties values. Based on the numerical and experimental correlation, the implemented approach was considered effective and with good repeatability.

Impact of winding parameters on the fiber bandwidth in the cylindrical area of a hydrogen pressure vessel for generating a digital twin

“…Gerhardt et al did numerical‐experimental instability analyses on filament‐wound rings and found a significant influence of imperfections (eigen buckling) on the mechanical stability during pressure tests. [ 18 ]…”

A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

“…Therefore, experimental studies are mostly appealed way to find post-buckling strength. [22][23][24][25][26][27][28] Experimental searches not only help to determine the crippling, but also it provides to specify the effecting parameters of the crippling strength and improve an understanding for the mechanics of the composite structures under the effect of compressive loads. In general, it is possible to gather the influential factors in three groups as geometrical effects, [29][30][31][32][33][34] material, [35][36][37][38][39] and boundary conditions.…”

“…However, it is impossible to express a direct relationship between extensional stiffness and bending stiffness for composites with only one equation. Therefore, experimental studies are mostly appealed way to find post‐buckling strength 22–28 …”