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Browsing by Author "Freitas, Manuel"
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Design and Assembly of an Ultrasonic Fatigue Testing Machine
Freitas, Manuel; Anes, V.; Montalvao, Diogo; Reis, Luís; Ribeiro, A. M. R. (2011-04)The lifetime approach in fatigue design based on S_N curves establish an infinite life when the cyclic stress applied is below than the endurance limit. Results in this field revealed fatigue failures beyond 10e7 cycles, ... -
Design and instrumentation of an ultrasonic fatigue testing machine
Anes, V.; Montalvao, Diogo; Ribeiro, A. M. R.; Freitas, Manuel; Fonte, Manuel (2011-06) -
Hysteretic Damping as an Energy Parameter in Gigacycle Fatigue
Ribeiro, A. M. R.; Montalvao, Diogo; Azinheira, J.; Freitas, Manuel; Reis, Luís; Fontul, M. (DVM, 2011)The mechanical behaviour of materials subjected to dynamic loading is now a classical subject but is still a big challenge. The fatigue limit of the materials, defined as the maximum dynamic load amplitude level for which ... -
Instumentation of Ultrasonic High-Frequency Machine to Estimate Applied Stress in Middle Section of Specimen
Lage, Yoann; Freitas, Manuel; Reis, Luís; Ribeiro, A. M. R.; Montalvao, Diogo (2012-07)The objective of this paper is to describe the instrumentation of a new developed ultrasonic fatigue testing machine at 20 kHz working frequency and compare the possible solutions to estimate the stress applied in the ... -
Rotary Fatigue Testing Machine to Determine the Fatigue Life of NiTi
Carvalho, André; Freitas, Manuel; Reis, Luís; Montalvão, Diogo; Fonte, Manuel (2015-04)Endodontic rotary file instruments used to treat root canals in dentistry suffered breakthrough transformations in recent years when stainless steel was replaced by Nickel-Titanium (NiTi). NiTi alloys used in Endodontics ... -
Rotary Fatigue Testing Machine to Determine the Fatigue Life of NiTi alloy Wires and Endondontic Files
Carvalho, André; Freitas, Manuel; Reis, Luís; Montalvao, Diogo; Fonte, Manuel (2015-09)Endodontic rotary file instruments used to treat root canals in dentistry suffered breakthrough transformations in recent years when stainless steel was replaced by Nickel-Titanium (NiTi). NiTi alloys used in Endodontics ... -
Rotary fatigue testing to determine the fatigue life of NiTi alloy wires: an experimental and numerical analysis
Carvalho, André; Freitas, Manuel; Reis, Luís; Montalvao, Diogo; Fonte, Manuel (2016-04-20)Endodontic rotary file instruments used to treat root canals in dentistry suffered breakthrough transformations in recent years when stainless steel was replaced by Nickel-Titanium (NiTi). NiTi alloys used in Endodontics ... -
A study on the influence of Ni-Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis
Montalvão, Diogo; Shengwen, Qiu; Freitas, Manuel (2014-07-01)The aim of this paper is to analyze the cyclic performance of two different Ni-Ti endodontic rotary files made from different alloys under bending using Finite Element Analysis (FEA). When experimentation is not available, ... -
Ultrasonic Fatigue Analysis on Steel Specimen with Temperature Control : Evaluation of Variable Temperature Effect
Lage, Yoann; Freitas, Manuel; Montalvao, Diogo; Ribeiro, A. M. R.; Reis, Luís (2012)