A5083502052- Structural Health Monitoring Techniques
- Ultrasonics and Acoustic Wave Propagation
- Fatigue and fracture mechanics
- Non-Destructive Testing Techniques
- Endodontics and Root Canal Treatments
- Engineering Structural Analysis Methods
- Sensor Technology and Measurement Systems
- Mechanical and Thermal Properties Analysis
- Occupational health in dentistry
- Electromagnetic Effects on Materials
- Dental materials and restorations
- Structural Engineering and Vibration Analysis
- Optical measurement and interference techniques
- Advanced Welding Techniques Analysis
- Acoustic Wave Phenomena Research
- Mechanical Failure Analysis and Simulation
- Recycling and Waste Management Techniques
- Material Properties and Failure Mechanisms
- Vibration and Dynamic Analysis
- Concrete Corrosion and Durability
- Surface Treatment and Coatings
- Advanced Sensor Technologies Research
- Metal Alloys Wear and Properties
- Advancements in Battery Materials
- Fuel Cells and Related Materials
Bournemouth University
2015-2024
University of Hertfordshire
2012-2016
Instituto Politécnico de Lisboa
2011-2014
Instituto Politecnico de Setubal
2004-2011
University of Lisbon
2011
Instituto Superior Técnico
2007
Fatigue is one of the main causes for in service failure mechanical components and structures. With development new materials, such as high strength aluminium or titanium alloys with different microstructures from steels, materials no longer have a fatigue limit classical sense, where it was accepted that they would ‘infinite life’ 10 million (107) cycles. The emergence used critical parts, including parts obtained metal additive manufacturing (AM), need weight reduction ambition to travel...
The application of an alternating magnetic field (0.54 T) was observed to lead improvement in the fatigue endurance and increase Vickers microhardness tensile strength both EN8 steel AA2014-T6 alloy. Fractography using scanning electron microscopy showed evidence more ductile fracture features after treatment contrast untreated samples. results X-ray diffraction indicated formation compressive residual stresses following treatment; while examination by transmission fewer dislocations. In...
The necessity to increase performances in terms of lifetime and security mechanical components or structures is the motivation for intense research fatigue. Applications range from aeronautics medical devices. With development new materials, there no longer a fatigue limit classical sense, where it was accepted that stress level such fracture up 1E7 cycles. recent ultrasonic testing machines frequencies can go as high 20 kHz over enabled tests be extended ranges larger than 1E9 just few...
Abstract In this paper, two special aluminium cruciform specimens are designed and tested in an ultrasonic fatigue machine. They were based on Single‐Input‐Multiple‐Output (SIMO) modal analysis to induce in‐plane biaxial stress combinations (in‐phase tension‐tension [T‐T] out‐of‐phase compression‐tension [C‐T]) when at resonance 20 kHz. The geometries subjected both numerical experimental testing understand if they can indeed create the intended state of stresses. Both results showed impact...
Results of cavitation erosion tests for EN8 steel, nickel-aluminium bronze (NAB), 70/30 brass and aluminium alloy AA2014-T6 following alternating magnetic field (AMF) treatment are presented. These alloys were selected because their nature; steel is ferromagnetic, NAB diamagnetic AA2014 paramagnetic. The indirect (ASTM G32–10 standard) fulfilled at a frequency 20 kHz in deionized water which was maintained room temperature ambient pressure predetermined time. results show significant...
The dynamic response of a structure can be described by both its translational and rotational receptances. latter ones are frequently not considered because the difficulties in applying pure moment excitation or measuring rotations. However, general, this implies reduction up to 75% complete model. On other hand, if modification includes inertia, receptances unmodified system needed. In one method, more commonly found literature, so called T‐block is attached structure. Then, force, applied...
The purpose of this study is to understand how the M-Wire alloy conditions mechanical flexibility endodontic rotary files at body temperature.Two different instruments, a Profile GT 20/.06 and Series X 20/.06, were selected due their geometrical similarity constituent alloy. series are made from M-Wire, Ni-Ti allegedly having higher temperature. Both analysed by X-Ray Diffraction Differential Scanning Calorimetry investigate phase transformations effects working temperature on these alloys....
In the drive towards a sustainable bio-economy, growing interest exists in development of composite materials using renewable natural resources. This paper explores life cycle assessment processing Flax fibre reinforced polylactic acid (PLA), with comparison glass triaxial fabric production process. The use hydrocarbon fossil resources and synthetic fibres, such as carbon, have caused severe environmental impacts their entire cycles. Whereas, Flax/PLA is one cornerstones for economic growth...
Many of the techniques developed to assess structural damage are based on experimental modal analysis. This paper presents a study extend current understanding how increasing in carbon fiber reinforced plastic affects damping factor laminated structure. Damage is introduced and quantified terms dissipated energy. It shown that there tendency for overall increase whereas stiffness decrease. While these results not novel, former quite relevant, since authors aware many other studies evolution...
The Detection and Relative Damage Quantification Indicator (DRQ) was presented previously as a reliable damage detection indicator when used with Operational Deflection Shapes (ODS). DRQ computed from the Response Vector Assurance Criterion (RVAC) between damaged initial ODS resulting value proved to be good of presence damage. use implies that loads applied structure without are either known or, at least, same. If forces not deterministic but still ergodic, power spectrum could evaluate...