Abstract
Due to the high-efficiency energy absorption and high-tension strength material properties of spider silk, many researchers have studied the mechanical properties and microstructure of the spider web. The concept of spider web structure has been recognized to be adopted for structural engineering aspect. The structure of spider web and its material properties have been studied for decades. However, the fundamental free vibration mode shapes and their corresponding frequencies have never been fully investigated. This study investigates the nonlinear characteristics in the large-amplitude free vibration of imperfect spider web structures using finite element analysis. The spider web applies the concept of elastic cables taking only axial deformation into account. The finite element models of a spider web considering geometric nonlinearities are employed. It should be noted that spider web could experience large deformation when the spider uses its silk to catch prey. This research aims at analyzing the linear and geometric nonlinear behaviour of imperfect spider web structure. Four different types of imperfect spider web: spiral imperfect spider web, radial imperfect spider web, central imperfect spider web, and circular rings imperfect spider web, are considered. It is found that pretension in spider silk plays a significant role in nonlinear vibration characteristics of the spider web. Moreover, the radial thread damaged tends to have a greater effect on structural free vibration of spider web in comparison with other imperfections. The outcome will help a structural engineer to adapt the concept of spider web, its properties, and damage patterns for any larger structures.
Highlights
Due to the high-efficiency energy absorption and high-tension strength material properties of spider silk, many researchers have studied the mechanical properties and microstructure of the spider web
The cable is elongated and the structure moves to the equilibrium state at dS0 at (x0,y0) which is considered as the initial configuration for dynamic state On account of free vibration at dynamic or displaced state ds, spider silk displaces to the position of (x0 + u, y0 + v, w), in which u, v and w are the hypothetic displacements in the direction of x, y and z-axis, respectively[20,21]
This study investigates the large amplitude free vibration behaviour of imperfect spider web
Summary
Due to the high-efficiency energy absorption and high-tension strength material properties of spider silk, many researchers have studied the mechanical properties and microstructure of the spider web. The structure of spider web and its material properties have been studied for decades. This study investigates the nonlinear characteristics in the large-amplitude free vibration of imperfect spider web structures using finite element analysis. This research aims at analyzing the linear and geometric nonlinear behaviour of imperfect spider web structure. The radial thread damaged tends to have a greater effect on structural free vibration of spider web in comparison with other imperfections. It is noted that there are two main thread elements in the spider web structure: spiral thread and radial thread based on geometry. The studies of the structural behaviour regarding the vibration characteristics of spider webs have not been fully investigated. The reasonable hypothesis can be obtained, nonlinear mode applies on large amplitude free vibration of spider webs rather than the linear mode. The nonlinear geometry is taken into account in nonlinear analysis due to the large deformation of spider web
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