Get Off the Courts: Using ADR Principles to Resolve High School Sport Disputes

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A Finite Element Analysis of the Effects of Preheating Substrate Temperature and Power Input on Selective Laser Melting

Several parameters are defined before the Selective Laser Melting printing process, which may depend on the manufacturer of the equipment, but in general, we commonly encounter hatch distance, scanning speed, layer thickness, laser power input, scanning strategy, overlap distance, and substrate preheating temperature as the parameters that mainly define the printing process. The last parameter is the focus of this study, which is applied to a finite element model to simulate temperature distributions over one layer thickness of the powder bed. The substrate temperature and power input affect the cooling rates and temperature gradients imposed on the powder bed, consequently influencing the component’s final property, surface finishing, and accuracy (dimensioning tolerances). The current FEM model showed that the preheat substrate temperature played different roles depending on which power input is used; however, there is an observed trend that is the reduction in temperature gradients in the powder bed overall when higher substrate temperatures are used

Parametric Thermal FE Analysis on the Laser Power Input and Powder Effective Thermal Conductivity during Selective Laser Melting of SS304L

A low-cost parametric finite element thermal model is proposed to study the impact of the initial powder condition, such as diameter and packing density, on effective thermal conductivity as well as the impact of the laser power input on the final temperature distributions during selective laser melting (SLM). Stainless steel 304L is the material used, since it is not yet commercially available in SLM equipment and our main goal was to show the capabilities of the finite element method in the evaluation of power input in the process. The results from our sensitivity analysis showed that packing density has a greater impact on the final temperature distributions compared with powder diameter variance. However, overall the thermal conductivity of the powder only showed significant effects below the melting point, otherwise the thermal conductivity no longer affected the temperature distributions. Among the three different power inputs analyzed, the temperature profile demonstrated that power inputs of 100 and 200 W are recommended when printing SS-304L rather than 400 W, which generates too high temperature in the powder bed, a non-favorable behavior that can induce high residual stresses and material evaporation

Flexural Behavior of FDM Parts: Experimental, Analytical and Numerical Study

Fused deposition modelling (FDM) processed parts behave as composite laminate structures. Therefore, mechanics of composite laminates can be adopted for the characterization of mechanical behavior of the printed parts. In this study, the flexural properties of the 3D printed laminates are investigated experimentally, analytically and numerically. Each layer of the printed specimens is treated as an orthotropic material. The elastic moduli of a lamina are calculated by considering the mesostructure of the printed laminate in finite element simulation of tensile testing. These elastic moduli are employed in a constitutive matrix for the calculation of flexural stiffness of the laminate using classical laminate theory. Then 3-point bending tests are conducted on the printed laminates to calculate their flexural stiffness. The influence of road/ fiber size and lamina layup on the flexural properties are also investigated. Furthermore, failure phenomena of printed laminates under bending loads is investigated.Mechanical Engineerin

A Finite Element Analysis of the Effects of Preheating Substrate Temperature and Power Input on Selective Laser Melting

Several parameters are defined before the Selective Laser Melting printing process, which may depend on the manufacturer of the equipment, but in general, we commonly encounter hatch distance, scanning speed, layer thickness, laser power input, scanning strategy, overlap distance, and substrate preheating temperature as the parameters that mainly define the printing process. The last parameter is the focus of this study, which is applied to a finite element model to simulate temperature distributions over one layer thickness of the powder bed. The substrate temperature and power input affect the cooling rates and temperature gradients imposed on the powder bed, consequently influencing the component’s final property, surface finishing, and accuracy (dimensioning tolerances). The current FEM model showed that the preheat substrate temperature played different roles depending on which power input is used; however, there is an observed trend that is the reduction in temperature gradients in the powder bed overall when higher substrate temperatures are used

Assessing The Influence Of Sport Security Operations On The Guest Experience: Using The Delphi Method To Understand Practitioner Perspectives

Increases in sport security measures may have an influence on guests’ decisions to attend sporting events or stay longer at them if they are already present. There is currently a dearth of literature on the consequences of security measures and related technologies on the guest experience and its resultant impact on revenue generation. This project, however, aims to be an important, initial attempt to fill this gap. This project involved a panel of subject matter experts currently working for a sport venue whose anchor tenant is in one of the United States’ four, major, professional sport leagues to determine how they perceive security issues and the potential effects of such issues on the guest experience through the use of the Delphi method (Dalkey & Helmer, 1963). The data yielded from this study emphasized both the importance of minimally impacting guests’ time while also requiring personnel to serve guests with skills across a wide range of customer service matters to engage them effectively

Get Off the Courts: Using ADR Principles to Resolve High School Sport Disputes

Non