Abstract
The middle layer model has been used in recent years to better describe the connection behavior in composite structures. The influencing parameters including low pre-screw and high preload have the main effects on nonlinear behavior of the connection as well as the amplitude of the excitation force applied to the structure. Therefore, in this study, the effects of connection behavior on the general structure in two sections of increasing damping and reducing the stiffness of the structures that lead to non-linear phenomena have been investigated. Due to the fact that in composite structure we are faced to the limitation of increasing screw preload which tend to structural damage, so the investigation on the hybrid connection (metal-composite) behavior is conducted. In this research, using the two-dimensional middle layer theory, the stiffness properties of the connection are modeled by normal stiffness and the connection damping is modeled using the structural damping in the shear direction. Nonlinear frequency response diagrams have been extracted twice for two different excitation forces and then proposed by a high-order multitasking approximation according to the response range of the nonlinear finite element model for stiffness and damping of the connection. The effect of increasing the amplitude of the excitation force and decreasing the preload of the screw on the nonlinear behavior of the component has been extracted. The results show that the limited presented novel component model has been accurately verified on the model obtained from the vibration experimental test and the reduction of nonlinear model updating based on that is represented. The comparison results show good agreement with a maximum of 1.33% error.
Highlights
Nowadays, the hybrid structures is a common material which is widely employed in design [1], and analyzing [2,3,4,5,6,7,8] of various industrial engineering component with its specific bottlenecks and uncertainties
Since the structure weight decreases due to increase of stiffness and damping of the structure, by using the thin middle layer model and its compatibility relationships, the approximation of the second order is presented according to the response range [20]
The main purpose of this paper is to provide a novel non-linear thin intermediate layer of four ordered nonlinear equation according to the response range for modeling the metal-composite behavior with two screws
Summary
The hybrid structures is a common material which is widely employed in design [1], and analyzing [2,3,4,5,6,7,8] of various industrial engineering component with its specific bottlenecks and uncertainties. The studies on thin layer element were conducted in order to update and extract the stiffness coefficients of the connection using linear elastic compatibility relationships and test results [17,18]. The studies reveal that the behavior of connection can be modeled in the compatibility equation of thin middle layer element using the normal and shear stiffness with acceptable accuracy of nearly 99.8% percentage of reliability [18]. Since the structure weight decreases due to increase of stiffness and damping of the structure, by using the thin middle layer model and its compatibility relationships, the approximation of the second order is presented according to the response range [20]. The main purpose of this paper is to provide a novel non-linear thin intermediate layer of four ordered nonlinear equation according to the response range for modeling the metal-composite behavior with two screws. The linear model obtained by the sensitivity method has been supplied with special values
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