On axisymmetric/diamond-like mode transitions in core-shell cylinders under axial compression.

Abstract eng:
Recent interests in ctmturc- and stress-induced pattern fonnetion and pattern selection mettiratc the present studs Srnfecc morphological urinating ot‘s cytinchical stall rumoured by a-sofl cm‘e subjected to axial compression is investigated basal or: a mudinenr 3D finite element model. The post—buckling behavior of core—shell cylinders beyond the first bifurcation often leads to cm'nplicaced [appraisers with surface mode transitions. The proposed finite element framework allows predicting and. tracing these bihrrcation portraits form a quantitative standpoint. The occurrence and evolution oflfl instability rnrfles'iraeluclin'g sinnsoidaliy dethroned antisymmetric [mourns and non-anisyrnmerricdiemerrd-liire modes will be highlighted according to critical dimensionless parameters. Besides. the phase diagram- ohta‘irrcd fi'o‘ri'r mooretieal analyses and nrnperi'cal results could be used to guide the design of core-shell cylindrical systems to achieve the desired instability patterns.

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