Optimization of process parameters of aluminum alloy AA 2014-T6 friction stir welds by response surface methodology

AbstractThe heat treatable aluminum–copper alloy AA2014 finds wide application in the aerospace and defence industry due to its high strength-to-weight ratio and good ductility. Friction stir welding (FSW) process, an emerging solid state joining process, is suitable for joining this alloy compared to fusion welding processes. This work presents the formulation of a mathematical model with process parameters and tool geometry to predict the responses of friction stir welds of AA 2014-T6 aluminum alloy, viz yield strength, tensile strength and ductility. The most influential process parameters considered are spindle speed, welding speed, tilt angle and tool pin profile. A four-factor, five-level central composite design was used and a response surface methodology (RSM) was employed to develop the regression models to predict the responses. The mechanical properties, such as yield strength (YS), ultimate tensile strength (UTS) and percentage elongation (%El), are considered as responses. Method of analysis of variance was used to determine the important process parameters that affect the responses. Validation trials were carried out to validate these results. These results indicate that the friction stir welds of AA 2014-T6 aluminum alloy welded with hexagonal tool pin profile have the highest tensile strength and elongation, whereas the joints fabricated with conical tool pin profile have the lowest tensile strength and elongation

Honor Systems and Open World Activities in Red Dead Redemption II: Impact on Players with Symptoms of Anxiety and Depression

This research delves into the profound impact of honor systems and open-world activities on players\u27 mental well-being within the immersive world of Red Dead Redemption II (2018). The study uncovers intricate connections between gameplay choices, playstyles, and psychological needs satisfaction using self-determination theory (SDT), shedding light on the well-being effects for players experiencing phases of low mood. Operationalized measures were employed to assess pre-game self-reported anxiety and depression symptoms, engagement within honor and open-world activities, and post-engagement mental well-being. Data was sourced through an online questionnaire (n = 210) and meticulously analyzed to unveil insights into the engagement and playstyles adopted to alleviate players’ symptoms of anxiety and depression. The study\u27s findings contribute valuable knowledge to the expanding research on video games and their impact on mental health, advocating for game development that harnesses these interactive media’s positive influence on players\u27 well-being

Home Away from Home

Home Away from Home is an e-Commerce application for short-term rentals of homes or apartments. This application presents a web portal for property owners to advertise their properties and lease them to renters for short-term stays. Its functionalities should include uploads, setting, auditing, property listings, bookings, payment processing, post-rental ratings, surveys, web mapping and more. The database maintains the home information required for a user to check and book the home. This Home Away From Home website is designed using the home rental website as examples, it contains all the information of renter, owner, admin. All the owners can post their properties on the website. All the information regarding the properties, owners and renters are stored in the database. Admin has the right to view the details of everything on the website. Software Requirements/Tools Operating System : Windows 7 & laterWeb Technologies : HTML5, CSS3, Bootstrap,Scripting Languages : JavaScript, jQueryDatabase : MS SQLFramework : .NET Modules Admin ModuleOwner ModuleRenter Modul