Resumo em Inglês:

Abstract To study the variation law of static tensile properties and damage mechanism of fiber metal laminates, this paper conducted static tensile tests on six types of GLARE specimens. During the testing process, the full-field strain data of the specimen were captured using Digital Image Correlation technology. A comparative analysis was conducted on the elastic modulus, tensile strength, stress-strain curve, and Poisson's ratio change curve. The fracture morphology of the specimen, strain cloud map before final fracture, and the process of strain difference formation were compared and analyzed. The results show that the bridging effect of fibers needs to be properly considered when using the hybrid model method to predict the tensile strength of the ±45°fiber-metal laminates. The role of the prepreg layer in the GLARE sample gradually increases after the metal material yields. For the same type of prepreg, the damage forms in different layers of the board are not exactly the same. Using the DIC method is helpful to study the damage process and boundary effects inside the fiber metal laminate.

Resumo em Inglês:

Abstract Composite structures have been successfully used in the construction of bridges and buildings as they present notable structural and constructive advantages over traditional reinforced concrete and steel systems. In steel-concrete composite beams, the joint action of the beam with the slab – which aims to exploit the main virtues of the two materials – is guaranteed by shear connectors. The stud-bolt is currently the most used connector in the world. However, the need to use specific equipment for welding makes its use difficult, especially on remote construction sites. To offer an alternative with good structural performance, low cost and easy execution, the Truss-Type shear connector was developed. In this study, a methodology was developed to numerically simulate the mechanical behavior of the Right-angle Truss-Type shear connector. Therefore, a parametric study was carried out in order to evaluate the influence of varying the connector height on its resistance. The results indicated that the use of linear finite elements in connector modeling provides good results and a significant reduction in computational cost.

Resumo em Inglês:

Abstract This paper presents a precise and effective formulation for modeling and simulating impact with friction for planar multibody systems. Nonlinear equations of motion are formulated using normal impulse at contact point as a time-like independent variable. The derived equations demonstrate that sliding during impact period could persist, or it could cease leading either to a persistence of sticking or to a reverse sliding. To distinguish between these different modes, Routh’s incremental method is employed. A critical coefficient of friction, dependent solely on the system configuration, is identified and used to determine whether the contact mode is sliding or sticking. Three definitions of coefficient of restitution are introduced to model the plasticity of the impact. Analytical algebraic solutions and a computational strategy are offered to identify the mode of impact and to evaluate the impact variables. An example is thoroughly examined to demonstrate the effectiveness of the formulation, validate the algebraic solutions, and evaluate the outcomes of the three definitions of the coefficient of restitution.