I Am Better Than Others: Waste Management Policies and Self-Enhancement Bias

Waste source separation has been a social dilemma globally with a low participation rate. This research attempted to solve this dilemma by exploring the effect of mandatory (versus voluntary) policies on waste separation from the perspective of the self-versus based on deterrence theory and self-enhancement motivation. Hypothetical scenarios were used to demonstrate the effectiveness of mandatory policies and self-enhancement bias for residents (n = 589) and adolescents (n = 121). Study 2 was performed to replicate the findings of Study 1 with a no-implementation policy condition, and Study 3 extended the findings to adolescents. We found robust self-enhancement bias, where participants perceived themselves to be better than others in both willingness to perform and attitudes toward waste separation behavior. Specifically, participants tended to perceive themselves to perform waste separation well when policy compliance was voluntary, but they tended to perceive others to perform well when policy compliance was mandatory with supervision. These findings highlight the impact of mandatory policy with supervision and self-enhancement bias in waste management. The present studies provide substantial evidence and implications for the necessity of supervision in mandatory policy implementation.

DESIGN AND ANALYSIS OF THERMOPLASTIC WELDED STIFFENED PANELS IN POST-BUCKLING

The Clean Sky 2 “SmarT mUlti-fuNctioNal and INtegrated TP fuselaGe" STUNNING project focusses on the next generation composite fuselage with emphasis on manufacturing techniques such as thermoplastic welding. Welded multi-stringer panels are investigated in this paper, with emphasis on the buckling and skin-stringer separation behavior. The multi-stringer panels are designed to approximate the structural behavior of the lower half of the MultiFunctional Fuselage Demonstrator of the STUNNING project. In particular, a section of the fuselage is analyzed using Abaqus with a dynamic implicit analysis, and the results of this analysis are used for the design of the multi-stringer panels, taking manufacturing considerations also into account. The panels have three omega stringers and a length of 500 mm. The three stringer configuration allows to study the middle stringer in pristine and damaged configuration with minimal influence of the free edges and boundary conditions. It is seen that the multi-stringer test panels show very similar buckling and skin-stringer separation behavior compared to the fuselage section. The first panels have been manufactured by project partners NLR and GKN Aerospace Fokker and will be tested at the Faculty of Aerospace Engineering at Delft University of Technology.