Compression, Shear and Bending Performance of X-type Lattice Truss Panel Structure by Theoretical Method and Simulation

Abstract

X-type lattice truss panel structure (LTPS) with high strength-weight ratio has anisotropic mechanical properties. This paper proposes a theoretical mechanical model to give predictions of the compression, shear and bending performance of LTPS including the effective compressive/shearing modulus, effective compressive/shearing strength and failure loads under three-point bending. These properties are expressed as analytical expressions involving all of the geometrical parameters. The numerical simulation is also performed, and the effects of the geometrical parameters are discussed. The results show that the predicted effective modulus and strength by the theoretical method agree well with the simulated results. The effective shear modulus in 23-direction is obviously higher than that in other directions. The geometrical parameters have significant effects on the mechanical properties. The shear yielding strength increases with the increase of truss width and thickness, while it decreases with the increase of truss length and platform length. The truss thickness has the greatest effect on yielding strength, followed by the truss width and the truss length. The changes of the yielding strength with the increase of the angle from horizontal and deflected angle are not monotonic. The failure loads of three-point bending by face sheets yielding and shear induced core collapse decrease, when the span increases. The proposed analytical expressions are available to the engineering application and more complicated calculations of structures made of X-type cores.