Passive Deformation Control of Structures With Structurally-Unsymmetric Laminate Configuration Pipes

Miki, Mitsunori; Onuki, Masahide; Murotsu, Yoshisada; Yamaguchi, Tetsuo

doi:10.2514/6.1993-1514

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2003

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“…Others have used similar methods to examine the impact of asymmetry (both in the skins themselves and as a whole sandwich) on sandwich beams or plates (e.g., [6][7][8][9]). Fewer still have considered the implications of asymmetric construction on the behavior of monocoque shells (e.g., [10][11][12][13][14]). Of these previous efforts, those of [3,[8][9][10]12] are notable for finding closed-form solutions to the cases they examined.…”

Section: Introductionmentioning

confidence: 99%

Theory for Midplane Asymmetric Sandwich Cylindrical Shells

Preissner¹,

Vinson

2003

Jnl of Sandwich Structures & Materials

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In shells, bending stresses in addition to the membrane stresses exist near each structural discontinuity (such as at edge supports, rings, stringers, holes, etc.) and each load discontinuity. This region is the “bending boundary layer”. In sandwich shells, mid-plane asymmetry can be employed to minimize these bending stresses. Governing equations for mid-plane asymmetric sandwich cylindrical shell subjected to axially symmetric loads are derived herein and solved. The solution involves a mid-plane asymmetry factor ϕ, defined herein such that for any asymmetric sandwich construction, -1 < ϕ < 1. Therefore, perturbation solutions are easily obtained using the solutions for the midplane symmetric cylindrical shell.

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