RT Dissertation/Thesis
T1 Study of structural joints with composite materials to enhance the mechanical response of bus superstructures
T2 Estudio de uniones estructurales con materiales compuestos para mejorar el comportamiento mecánico de super-estructuras de autobuses
A1 Lavayen Farfán, Daniel
AB Steel structures have an ubiquitous presence in several industries due to their availabilityand low price. Bus super-structures are typically built using structural steel hollowshapes and serve a major role during crashes and rollovers, as they protect the passengersby absorbing the kinetic energy of impacts and dissipating it as plastic deformations. Inrecent years, composite materials have gained protagonism in numerous applications dueto their high specific strength and stiffness. However, costs and manufacturing complexityhave made all-composite automotive structures economically unfeasible. Thus, the currenttendency is the use of multimaterial structures: using composites only in the zoneswhere they are needed, while keeping an inexpensive material, like steel, elsewhere. Hollowstructural shapes, used in bus structures, are susceptible to bending collapse failureduring rollover and crashes, which must be precisely predicted and calculated. Existingtheoretical models for this failure mechanism have certain limitations to account for largerthickness, plastic hardening, and composite reinforcements. The present work aims to addressthese limitations through the development of new theoretical models for the so-calledmedium-thin-walled hollow shapes, as well as for reinforced CFRP-Steel hollow shapes.Both materials are joined using structural adhesives due to their ease-of-use and relativelylow price. Experimental test results have shown the validity and accuracy of the proposedmodels. These proposed models are then implemented in a concept model of a busstructure to address its crashworthiness and the effectiveness of the reinforced shapes.
YR 2021
FD 2021
LK https://hdl.handle.net/10016/35880
UL https://hdl.handle.net/10016/35880
LA spa
DS e-Archivo
RD 1 sept. 2024