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Browsing by Author "Ribeiro, A. M. R."
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Automation in Strain and Temperature Control on VHCF with na Ultrasonic Testing Facility
deFreitas, Manuel; Lage, Yoann; Ribeiro, A. M. R.; Montalvão, Diogo; Reis, Luís (2013-05-22)The necessity of increased safety and reliability in mechanical components or structures became a subject of prime importance over the years. Therefore, to have a proper understanding of the damage and rupture mechanisms ... -
Damping measurements on a carbon fibre reinforced laminate
Montalvao, D.; Ribeiro, A. M. R.; Maia, N. M. M.; Duarte Silva, J.; Claudio, R. A. (KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE, 2006)By performing force-displacement tests in a universal testing machine it is possible to accurately measure the damping of a material. By providing accurate estimates of the damping for a set of given conditions, it should ... -
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) -
Estimation of the rotational terms of the dynamic response matrix
Montalvao, D; Ribeiro, A. M. R.; Maia, N. M. M.; Silva, J. M. M. (2004)The dynamic response of a structure can be described by both its translational and rotational receptances. The latter ones are frequently not considered because of the difficulties in applying a pure moment excitation or ... -
Experimental Assessment of a Modal-Based Multi-Parameter Method for Locating Damage in Composite Laminates
Montalvao, D.; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (2011-11)The low specific weight of composite materials, together with their excellent mechanical properties, make them suitable to be widely used in many modern engineering structures. However, composite materials are quite sensitive ... -
Experimental Measurement of the Complex Young’s Modulus on a CFRP Laminate considering the Constant Hysteretic Damping Model
Montalvão, Diogo; Claudio, R. A.; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (2013)When considering structural loss in vibration problems, the Young’s modulus is a complex value that may be defined in the Argand plane as the vectorial sum of the real part of the Young’s modulus itself and the loss modulus. ... -
An experimental study on the evolution of modal damping with damage in carbon fiber laminates
Montalvão, Diogo; Karanatsis, Dimitris; Ribeiro, A. M. R.; Arina, Joana; Baxter, Richard (2015-08)Many of the techniques developed to assess structural damage are based on Experimental Modal Analysis (EMA). This paper presents a study to extend the current understanding of how increasing damage in a Carbon Fiber ... -
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 ... -
A method for the localization of damage in a CFRP plate using damping
Montalvao, D.; Ribeiro, A. M. R.; Duarte-Silva, J. (2009-08)In the past 25 years, the scientific and industrial communities have made great efforts on the fields of damage detection and structural health monitoring (SHM). However. no single approach has proven appropriate for all ... -
A Numerical-Experimental Method for the Damage Location in Composite Plates
Montalvao, Diogo; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (Civil-Comp Press, 2010-09) -
On the estimation of rotational frequency response functions
Montalvao, D.; Ribeiro, A. M. R.; Maia, N. M. M.; Silva, J. M. M. (KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE, 2005)Rotational receptances can perform an important role when predicting the dynamic behaviour both in theoretical and experimental models, especially when a modification includes a rotational inertia or a rotational stiffness. ... -
On the use of vibration parameters for the estimation of damage in laminated composite plates
Montalvao, Diogo; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (2010-06) -
On the use of vibration parameters for the estimation of damage in laminated composite plates
Montalvao, Diogo; Duarte-Silva, J. A. B.; Ribeiro, A. M. R. (2010-01-01)The dynamic response of a structure depends on the system's particular characteristics, namely its mass, stiffness and damping properties. Vibration-based damage detection techniques assume that damage will induce a local ... -
A review of vibration-based structural health monitoring with special emphasis on composite materials
Montalvao, Diogo; Maia, N. M. M.; Ribeiro, A. M. R. (2006-07-01)Structural health monitoring and damage detection techniques are tools of great importance in the off-shore, civil, mechanical and aeronautical engineering communities, both for safety reasons and because of the economic ... -
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) -
Using the Detection and Relative Damage Quantification Indicator (DRQ) with transmissibility
Maia, N. M. M.; Ribeiro, A. M. R.; Fontul, M.; Montalvao, Diogo; Sampaio, R. P. C. (TRANS TECH PUBLICATIONS LTD, 2007-01-01)The Detection and Relative Damage Quantification Indicator (DRQ) was presented previously as a reliable damage detection indicator when used with Operational Deflection Shapes (ODS). The DRQ was computed from the Response ...