On the buckling and post-buckling of core-shell cylinders under thermal loading. (November 2017)

• Record Type: Journal Article
• Authors: Xu, Fan; Abdelmoula, Radhi; Potier-Ferry, Michel
• Is Part Of: International journal of solids and structures. Volume 126/127(2017)
• Page Start: 17
• Page End: 36
• Publication Date: 2017-11
• Subjects: Post-buckling -- Core-shell cylinder -- Bifurcation analysis -- Continuation technique -- Thermal wrinkling; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2017.07.024
• Languages: English
• ISSNs: 0020-7683

Abstract

Highlights: Theoretical analyses were conducted to find curvature-related key parameters for pattern selection in core-shell soft cylinders under thermal loading. Transition from subcritical to supercritical bifurcation was captured both analytically and numerically. Curvature and modulus effects on pattern formation are quantified by a new dimensionless parameter Ct . A 3D shell/solid coupled finite element model was applied for post-buckling analysis from a quantitative standpoint. Tracing of post-buckling evolution was performed by a path-following continuation technique. Graphical abstract: Abstract: There has been a strong and recent research activity to obtain tunable wrinkling patterns in film/substrate systems, which proposes to use geometric curvature as a control parameter. This paper studies core-shell cylindrical systems under thermal loads, with the aim to describe possible wrinkling modes, bifurcation diagrams and dimensionless parameters influencing the response of the system. In the companion case of axially compressed core-shell cylinders, it was established that instability modes can be axisymmetric or diamond-like, the post-buckling response of the system is governed by a single dimensionless parameter Cs, and the bifurcation becomes supercritical for a sufficiently stiff core. In the present case of cylindrical core-shells subjected to thermal loading, one finds quite different buckling patterns, named churro-like modes that are characterized by a fast undulation in the circumferential direction. There exists another curvature-related influencing parameter Ct, and a subcritical to supercritical bifurcation transition is observed when the core stiffness increases. The problem is analyzed both theoretically and numerically based on finite element calculations. Lastly, the obtained instability modes remain about the same as in pure shell structures, the main difference being the stabilization of the post-bifurcation behavior.