Analysis of Sandwich Structures

Abstract

A sandwich structure is comprised of layered composite materials formed by bonding two or more thin facings or facesheets to a relatively thick core material. This article describes the sandwich panel failure modes. It tabulates the nomenclature and definitions for loads, geometry, and material properties. The article illustrates critical strength-check locations for a flat sandwich panel. It discusses the analysis methods formulated for flat rectangular honeycomb panels; curved sandwich panel; and for each of the various sandwich panel failure modes. The article concludes with a discussion on flat panel stability analysis methods.

A review of mode I dominant interfacial fracture toughness test methods of skin-core bonding for thermoplastic composite sandwich structures

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Sandwich structures in principle consist of a three-layer cross-section with a core and two covering facesheets. 25 The resulting composition is similar to an I-beam structure with a clear division of tasks between facesheets and core, following the stress distribution in the cross-section induced by bending loads. 26 The facesheets carry the majority of the normal stresses.…”

Composite sandwich panel closeout analysis and test

“…Considerable research works have been performed on the study of sandwich closeout structures. [11][12][13][14] Most ramps are characterized by a tapering angle of top facesheet as shown in Figure 2(a). Kassapoglou 15 developed a solution for calculating stress at a sandwich rampdown region under bending moments, and core failure was predicted with a quadratic failure criterion combining normal stress and shear stress.…”