A5070797402- Advanced Fiber Optic Sensors
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Isotope Analysis in Ecology
- Natural Fiber Reinforced Composites
- Advanced Sensor and Energy Harvesting Materials
- Astronomy and Astrophysical Research
- Mechanical Behavior of Composites
- Structural Health Monitoring Techniques
- Innovative Energy Harvesting Technologies
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
- Textile materials and evaluations
- Computational Physics and Python Applications
- Smart Materials for Construction
- Atmospheric and Environmental Gas Dynamics
- Gyrotron and Vacuum Electronics Research
- Composite Material Mechanics
- Advanced Sensor Technologies Research
- Gamma-ray bursts and supernovae
- Cellular and Composite Structures
- Composite Structure Analysis and Optimization
- Tactile and Sensory Interactions
Politecnico di Milano
2022-2025
The aim of this work is to review the literature hygrothermal ageing in composite structures, focusing on effects moisture absorption mechanical properties, damage behavior and degradation mechanisms responsible for changes performance. Potential causes that can lead failures are detected main variables influence taken into account: these include surrounding environment climate conditions, which appear be determinant. Secondly, a case study analysis previous accidents involving aircraft...
Composite materials are increasingly used in the aviation industry for various aircraft components due to their lightweight and mechanical performances. However, these susceptible degradation environmental factors such as hot–wet environments freeze–thaw cycles, which can compromise performance safety over time. This study develops an innovative Fiber Bragg Grating (FBG) sensor system capable of not only measuring but also decoupling simultaneous effects temperature, humidity strain. Unlike...
The first section of this work is dedicated to the exposure possible methodologies and solutions that can be implemented face hygrothermal ageing effects, avoiding reduction service-life increasing safety margins. It's underlined importance material manufacturing process selection, its impacts on issues related ageing. Nanofiller, Surface fiber treatments are investigated their influence moisture uptake discussed. second part technique used detect remove moisture. It shows how an early...
Multi-converter piezoelectric harvesters based on mono-axial and bi-axial configurations are proposed. The exploit two four converters (PCs) adopt an impinging spherical steel ball to harvest electrical energy from human motion. When the harvester undergoes a shake, tilt, or combination of two, hits one PC, inducing impact-based frequency-up conversion. Prototypes have been designed, fabricated, fastened wrist person by means wristband watchband, experimentally tested for different motion...
This work presents a novel development of the impact-based mechanism for piezoelectric vibration energy harvesters. More precisely, effect an impacting mass on cantilever transducer is studied both in terms tip value attached to and impact position find optimal condition power extraction. At first, study carried out by means parametric analyses at varying unimorph MEMS cantilever, suitable physical interpretation associated electromechanical response given. The multiple impacts also...
ABSTRACT In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the Whole Earth Blazar Telescope (WEBT) Collaboration. We present WEBT optical data in BVRI bands acquired at 36 observatories around world. mid-2021 source showed its historical maximum, with R = 11.14. The light curves display many episodes of intraday variability, whose amplitude increases brightness, agreement a geometrical interpretation long-term flux behaviour. This is also...
In recent decades, the aviation industry has increasingly adopted composite materials for various aircraft components, due to their high strength-to-weight ratio and durability. To ensure safety reliability of these structures, Health Usage Monitoring Systems (HUMS) based on optical fibers (FO), particularly Fiber Bragg Grating (FBG) sensors, have been developed. However, both are susceptible environmental factors such as moisture, in addition well-known effects mechanical stress thermal...
Abstract Background Understanding and characterizing delamination in composite laminates is fundamental for analysing their structural integrity, since operational loads may promote the propagation of interlaminar defects. Propagation often occurs mode II driven by shear stress. However, methods used to characterise this are affected frictional effects between crack surfaces. Objective This work aims build up an experimental method identify effect friction a 4 points End Notched Flexure...
This work focuses on the manufacturing and testing of a new device for medical bandage monitoring. Excessive pressure exerted from compression can block blood flow patient, causing different complications to skin, nerves, circulatory system. On contrary, if applied is low, therapy not effective. The utility, therefore, arises capable quantitatively indicating correct adjustment bandage. technological demonstrators developed consist polyurethane elastomeric shell with thin composite...
In recent decades, the aviation industry has embraced use of composite materials in various aircraft components. However, these face challenges extreme environmental conditions during operational life aircraft. One prominent issue contributing to safety concerns is potential failure components due degradation their mechanical properties caused by moisture absorption. Numerous accidents have been linked this phenomenon, underscoring critical need for robust monitoring systems ensure continued...
In recent decades, the aviation industry has increasingly adopted composite materials for various aircraft components, due to their high strength-to-weight ratio and durability. To ensure safety reliability of these structures, Health Usage Monitoring Systems (HUMSs) based on fiber optics (FO), particularly Fiber Bragg Grating (FBG) sensors, have been developed. However, both optical fibers are susceptible environmental factors such as moisture, in addition well-known effects mechanical...
Composite materials are increasingly used in the aviation industry for various aircraft components due to their lightweight and mechanical performances. However, these susceptible degradation environmental factors such as hot-wet environments freeze-thaw cycles, which can compromise performance safety over time. This study develops an innovative Fiber Bragg Grating (FBG) sensor system designed simultaneously measure decouple effects of temperature, humidity strain on composite materials,...