Numerical modeling of the contact effect on the parameters of cracking in a 2D Fatigue Fretting Model

The objective of this work is to study the effects of contact parameters on the cracking parameters of a specimen and a pad assembly. These parameters have been studied and evaluated by the finite element method analysis in two dimensions fretting fatigue model through the Abaqus calculation code. Different values ​​of the coefficient of friction of 0.1, 0.3 and 0.6 were applied on the various lengths in contact for a = 0.1, 0.5 and 1mm. Thus, on the various values ​​of angle of orientation of the crack equal to 15 °, 30 ° and 45 °. In addition, elements of the type (CPE4R) and the criterion of maximum tangential stress were applied. The curves of the crack parameters such as the SIF coefficients and the integral J were obtained and discussed.

Study on 3D Truss Flexible Shape Bridge Using Origami Engineering

<p>The purpose of this paper is to propose a design method when designing a bridge from origami engineering. Origami engineering has the characteristics of "foldable", "high rigidity" and "engineering design".</p><p>Origami engineering is widely used from interior design to the space field. There are various types, but in this paper, we focus on Yoshimura folds. Focusing on the characteristics of Yoshimura folds, we use it as the main girder of the bridge in this study. Analyze the properties of Yoshimura folds and devise a bridge model. Bridge modeling is determined by the section angle θ, the relationship between span and rise, and the relationship between girder height and span. Make a model and check the folding behavior. Determine the parameters for making a wooden bridge with a span of 8 m. Finite element method analysis and eigenvalue analysis are performed from the determined parameters. Stress analysis and resonance are examined based on the analysis results. Finally designed and produce a wooden footbridge.</p><p>In this study, we designed and constructed one design proposal using origami engineering. By limiting the material to wood, it became a bridge like this one. However, it can be said that various shapes can be expected depending on the material. In the future, we can expect various designs for deployable bridges using origami engineering.</p>