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Resistance welding of thermoplastic composite: from laboratory optimization to scale-up on a fuselage demonstrator
No full textFuture aircraft manufacturing factories are moving towards more flexible and adaptable manufacturing systems that enable shorter manufacturing cycles, environmental friendliness, energy efficiency, and higher productivity. A global aeronautic trend to face this challenge includes the replacement of metal parts with composite counterparts with emphasis on thermoplastic composites (TPCs) for their unique ability to be recycled, reprocessed, and welded. Aiming to commit to the drastic projected increase in aircraft production rates, WELDER project, focused on the next-generation MultiFunctional Fuselage Demonstrator (MFFD), has promoted the development and investigation of highly integrated and robotized manufacturing technologies that needed to be scaled up from a laboratory to an industrial environment. To contribute to such an advance, resistance welding was investigated in this work and successfully automatized for fuselage components assembly.
Welding investigation, including process maturation, parameter optimization, and scale-up analysis was performed at laboratory using LM-PAEK/CF composites. A resistance welding Heating Element (HE), made of stainless steel metal mesh and embedded in glass fiber scrims, was first designed and manufactured using a hot press. The HE, priorly characterized by electrical analysis, was adopted, in conjunction with a lab-scale welding head, to optimize and define appropriate processing times (welding and cooling), welding power, and pressures for the welding of the composite parts. The welds were characterized by visual inspection, microscopy analysis, and mechanical tests (SLSS tests - AITM 1-0019). Once materials and processes were optimized, they were scaled up to finally perform the welding of the frame couplings into MFFD
Teoría de la información cuántica del vacío (TICV): El código fuente del universo
Get PDFLa teoría de la información cuántica del vacío (TICV) plantea que el vacío cuántico no constituye una ausencia, sino una red activa de información entrelazada cuyas correlaciones generan la estructura del espacio-tiempo, el campo gravitacional y los fenómenos cuánticos. En este trabajo se desarrolla formalmente este enfoque, mostrando cómo principios como el entrelazamiento cuántico y la holografía permiten reinterpretar la geometría y la dinámica del universo desde una perspectiva informacional.
Se demuestra que la paradoja de la pérdida de información en agujeros negros puede resolverse mediante redistribución no local de entropía en el vacío, preservando la unitariedad del sistema. Asimismo, se derivan predicciones concretas: correcciones tipo Yukawa a la ley de gravedad a escala micrométrica, firmas angulares en correlaciones ópticas (C(θ) ∝ cos(2θ)), y una corrección logarítmica positiva a la entropía de Bekenstein–Hawking. Estas hipótesis, aunque especulativas, son contrastables mediante tecnologías actuales como sensores cuánticos, interferometría de átomos fríos y simulaciones cuánticas.
Finalmente, se discuten posibles aplicaciones en computación cuántica topológica, metrología de precisión y simulaciones de geometría emergente, así como conexiones con teorías como LQG, cuerdas y gravedad entraronpica. La TICV ofrece así un marco unificador que vincula mecánica cuántica y relatividad general, posicionando al vacío como el “código fuente” que estructura la realidad física.
 
Reliability assessment of individual water supply pipelines using machine learning techniques
Get PDFStatistical linearization-based optimal tuning of tuned mass nonlinear damper inerter for seismic response mitigation of buildings with hysteretic inter-story isolation
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Experimental study on seismic performance of frictional hybrid coupled wall systems with frictional steel truss coupling beams
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