Nonlinear bending of unsymmetric double-layer lattice truss core sandwich beams

Na Hao ^[1] ; Linfeng Zhu ^[1] ; Zhangming Wu ^[2] ; Liao-Liang Ke ^[1]
1. [1] Tianjin University
  
  Tianjin University
  
  China
2. [2] School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, China;c School of Engineering, Cardiff University, Cardiff, UK
Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 52, Nº. 9, 2024, págs. 6462-6483
Idioma: inglés
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Resumen
- This paper studied the nonlinear bending of unsymmetric double-layer lattice truss core sandwich beams (LTCSBs). Five unsymmetric cases are considered by varying different materials and geometric thicknesses in two layers. To establish a theoretical model for the unsymmetric double-layer LTCSBs, Allen’s model and von Kármán nonlinear theory are employed. The present theoretical model is established by considering the midplane of the mid-sheet as the reference plane. Ritz method is applied to determine the deflection for the nonlinear bending, and verified by the finite element method (FEM). Finally, the effects of the loading direction, unsymmetric factors, and boundary conditions on the nonlinear bending behaviors of LTCSBs are studied. It is found that the nonlinear deflections of unsymmetric LTCSBs may exhibit softening-spring nonlinearity in one direction.