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Composite sustainability for aviation - Problem or solution?
No full textComposite materials have highly contributed to the reduction of CO2 emissions of last generation aircrafts, due to their lightweight capabilities. However, the environmental burden during composite raw material production, part manufacturing and waste treatment versus aluminium alloys has become a priority during recent years and needs to be addressed asap. This applies to current aircraft but above all to ensure that composites are the best material choice for future more conventional or breakthrough products based on sustainable aviation fuel or liquid hydrogen propulsion.This presentation has the intention to be a general and comprehensive overview of the current situation and opportunities regarding composite sustainability for commercial aeronautical sector, including:
Problem understanding: composites are key for more sustainable aviation.
As-is situation: raw material and part production, composite scrap treatment.
Opportunities to develop more sustainable composites: biosourced composites and mass balance, substance compliance, industrial carbon footprint reduction, recycling technologies and recyclable resins.
Some tips and recommendations about how to approach the development of more sustainable composites and what to prioritize from a technical point of view
Impact-Fatigue of Self-Reinforced Polyethylene Terephthalate
No full textThe objective of this work was to characterise the impact-fatigue behaviour of self-reinforced polyethylene terephthalate (srPET). The impact characterisation results, covering the range of incident energies from subcritical to perforation, show that the main deformation mechanism is plastic deformation followed by tensile fracture of the PET fibres, and that the energy penetration threshold for a 1.1 mm thick specimen is 13.9 J. In single-impact scenarios, srPET has a specific penetration threshold of 3.24 J/g, which is worse than self-reinforced polypropylene (srPP). However, if the environmental goal is to reduce waste volume, srPET is a better option since PET has a recycling fraction of 18.2%, compared to 2.7% for PP. Additionally, srPET guarantees a lifespan of 100 impacts for incident energies up to 60% of its penetration threshold, while srPP cannot exceed 40%. Finally, the fatigue life loss of srPET is also more gradual, a key aspect from the structural integrity point of view
Level of Compliance of School Buildings on DepEd Order No. 6, S. 2021: A Basis for Policy Formulation
No full textIn developing educational infrastructure, adherence to regulatory standards is vital to ensuring safe, conducive learning environments. This study evaluated the compliance of public-school buildings in the DepEd Division of Tuguegarao with DepEd Order No. 6, s. 2021. Using both quantitative and qualitative approaches, researchers conducted actual observations with a structured tool patterned after the DepEd Order. They surveyed school physical facilities coordinators and school heads to measure awareness levels. Findings revealed varied levels of compliance across five building groups. Groups 1 and 3 recorded weighted means of 1.54 and 1.65, respectively, indicating non-compliance, whereas Groups 2 and 4 showed partial compliance, with weighted means of 1.68 and 1.83, respectively. Group 5 achieved better compliance with a mean of 2.57. Meanwhile, awareness levels among coordinators and school heads were high, ranging from 2.63 to 2.97. Interestingly, the study found significant negative correlations between compliance and awareness for non-donated buildings, particularly in stairways (-0.72871) and corridor railings (-0.68859). For donated buildings, however, little to no significant correlations were observed in classroom size, architectural features, plumbing, and structural components. Overall, the study highlights critical areas of non-compliance and the need for targeted improvements in school infrastructure
Successive approximation method for solving (1+1)-dimensional dispersive long wave equations
Get PDFIn this paper, we study the (1+1)-dimensional dispersive long wave equations which describe the evolution of horizontal velocity component u
Comparison of Polynomial Chaos Expansion and Polynomial Chaos Kriging for Uncertainty Quantification of NACA66(MOD) Hydrofoil
Get PDFThermomechanical Loading Induced Buckling and Failure Analysis of Thermoplastic Composite Pipes
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