A5010952965- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Welding Techniques and Residual Stresses
- Fatigue and fracture mechanics
- Aluminum Alloy Microstructure Properties
- Advanced Welding Techniques Analysis
- High Entropy Alloys Studies
- Semiconductor Quantum Structures and Devices
- Aluminum Alloys Composites Properties
- Titanium Alloys Microstructure and Properties
- High Temperature Alloys and Creep
- High-Velocity Impact and Material Behavior
- Microstructure and Mechanical Properties of Steels
- Chalcogenide Semiconductor Thin Films
- Vascular Malformations Diagnosis and Treatment
- Metal Forming Simulation Techniques
- Surface Treatment and Residual Stress
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Intracranial Aneurysms: Treatment and Complications
- Topological Materials and Phenomena
- Solid State Laser Technologies
- Metallurgy and Material Forming
- Quantum Dots Synthesis And Properties
University of Coimbra
2014-2024
Instituto Politécnico de Lisboa
2022-2024
University of Lisbon
2024
Loyola Medicine
2018
Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo
2018
Centro Universitário do Pará
2018
Universidade Federal do Pará
2018
City College of New York
2013-2015
The Graduate Center, CUNY
2014-2015
CUNY School of Law
2014
In this study, the connection between total strain energy density and fracture surface topography is investigated in additively manufactured maraging steel exposed to low-cycle fatigue loading. The specimens were fabricated using laser beam powder bed fusion (LB-PBF) examined under fully-reversed strain-controlled setup at amplitudes scale from 0.3% 1.0%. post-mortem surfaces explored a non-contact 3D measuring system entire method. focus on relationship characteristics, expressed by...
In this paper, the applicability of cumulative strain energy density is explored as a fatigue indicator parameter for advanced high-strength steels subjected to strain-controlled conditions. Firstly, cyclic stress–strain responses nine steels, selected from three multiphase families, encompassing different elemental compositions and heat treatment routes, were studied. Then, predictive capabilities proposed model compared with those other strain-based energy-based approaches. It was found...
This study presents a numerical model to predict the fatigue crack growth (FCG) rate in compact tension specimens under constant amplitude cyclic loadings. The material studied is Ti-6Al-4V titanium alloy produced by selective laser melting, which was submitted two different post-treatments: (i) hot isostatic pressing, and (ii) heat treatment. developed finite element uses cumulative plastic strain at tip define nodal release. Two FCG criteria are presented, namely incremental (IPS)...
Selective laser melting (SLM) is an additive manufacturing process for producing metallic components with complex geometries. A drawback of this the process-inherent poor surface finish, which highly detrimental in materials submitted to fatigue loading situations. The goal work analyze behavior Ti-6Al-4V specimens internal axial channels under following different conditions: hole drilled, as manufactured, and threaded M4 × 0.7. All cases studied showed a lower performance compared solid...
Global approaches have been the main procedure for designing structural details and components under fatigue loading. This is easy to apply but it disregards not only effect of material type also influence geometry. On other hand, local rely on specific parameters that can be assessed each detail The derived from low cycle (LCF) tests are most common damage used predict life establish design approaches. Recently, Huffman proposed a model based strain energy density dislocation material. In...
The fatigue behavior of the aluminum alloy AlSi10Mg manufactured by laser powder bed fusion for as-build and residual stress relief conditions with different notch geometries will be studied in this work. tests (R=0) are carried out, at ambient temperature load control mode. main results showed that heat treatment had a slight positive effect on strength, effectively relieved stresses. presence notches decreased life when compared to specimens without notches. Also, model based SWT parameter...
The main objective here is the understanding of effect plastic zone ahead crack tip on fatigue growth (FCG). For that, a numerical simulation FCG was made, based cumulative strain, considering bi-material composed by 6082-T6 and 7050-T6 aluminium alloys. first one has lower yield stress but higher critical strain. values da/dN are for which means that easier deformation dominates over 6082-7050 showed pronounced decrease near interface, starts when monotonic reaches material transition. This...
This paper studies the fatigue behaviour of smooth and notched specimens made from AlSi10Mg aluminium alloy via LPBF additive manufacturing. Three material conditions were addressed: as-built, stress relief, hot isostatic pressing. Heat treatments conducted at a temperature to avoid Al-Si network rupture, resulting in an increased strength both specimens. beneficial effect heat was attributed homogenization residual stresses through specimen depth. In addition, introduction notches had...
Selective Laser Melting (SLM) is an additive manufacturing technology, ideal for the production of complex-shaped components. Design against fatigue fundamental in presence cyclic loads, particularly these materials which typically have significant porosity, high surface roughness and residual stresses. The main objective here to study crack growth (FCG) 18Ni300 steel obtained by SLM. Typical da/dN-ΔK curves were C(T) specimens, indicating that plastic deformation may be controlling...
The aim of this research is to study the effect three different tool geometries and two joint on quality AA 5083-H111 T-welds done using friction stir welding process (FSW). All tools have concave shoulder with pin geometries: tapered threaded, quadrangular pyramidal progressive pin, part threaded cylindrical pyramidal. T-lap T-butt joints configurations been studied. Tunnel kissing-bond type defects found in produced a tool, while welds only show presence oxide lines. Sound were tool. No...