Encontrados 67 documentos, a visualizar página 1 de 7
The assessment of the generated temperature by the drill bit in the bone tissue
Sampaio, Cátia; Fonseca, E.M.M.; Ribeiro, J.E.; Cerqueira, RuiThe main goal of this work is to evaluate the developed temperatures in bone tissue due to a drilling process, and verify the hypothesis of the thermal necrosis occurrence. Experimental methods were used in the laboratory based on the use of thermography and thermocouples during bone drilling in different materials. The follow-up of patients was also performed during the dental implants placement for data colle...
The assessment of the generated temperature by the drill bit in the bone tissue
Sampaio, C.T.; Fonseca, E.M.M.; Ribeiro, J. E.; Cerqueira, R.This work aims to evaluate the generated temperature in bone tissue during a drilling process. Different clinic visits were carried out to follow-up a dental implantology and collected thermographic images for reading the temperature generated during the drilling. Simultaneously an experimental procedure was adopted with the acquisition of four blocks of Sawbones with similar properties to the trabecular and co...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.: Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos o...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos oco...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.; Vaz, M.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.V. dos; Vaz, M.A.P.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
Displacement and strain field assessment of PDMS using digital image correlation
Mendonça, B.; Ribeiro, J.E.; Lopes, H.; Martins, P.; Vaz, M.The main goal of this work is the characterization of the hyper-elastic mechanical behaviour of PDMS. The special specimens of PDMS (Sylgard® 184) were tested in a bi-axial tensile machine. The displacement and strain fields were measured using a commercial digital image correlation system (ARAMIS of GOM) during the tensile test. The experimental measurements are compared with numerical simulations, which use t...
FBG sensors application for residual stress measurement using the hole drilling...
Braga, D.; Silva, A.; Viriato, N.; Ribeiro, J.E.; Moreira, P.This work focus on the development of a new sensor for residual stress measurement using fiber optic Bragg sensors. A known stress field was induced on a specimen and results obtained from both the fiber optic Bragg sensors rosette and traditional electrical strain rosette were compared. Also a FEM model was used to confirm the obtained results.
Damage identification using real time rotating field analysis
Lopes, H.; Ribeiro, J.E.; Santos, J.V.A. dos; Vaz, M.A.P.; Gomes, J.F.S.This paper proposes a real time damage identification method based on the perturbation analysis of the rotation field, which are measured using shearography technique. A particular case of phase modulation method is applied to the interference pattern in order to improve the spatial resolution of the rotation field. A program was developed in Matlab® platform for digital recording the information capture by CCD...
Displacement and strain field assessment of PDMS using digital image correlation
Mendonça, B.; Ribeiro, J.E.; Lopes, H.; Martins, P.; Vaz, M.; Gomes, S.The main goal of this work is to characterize the hyper-elastic mechanical behaviour of PDMS. For that, were made-up special specimens of PDMS (Sylgard® 184) for test them in bi-axial tensile machine. During the tensile test was used a commercial digital image correlation system (ARAMIS of GOM) to obtain de displacement and strain fields. These measurements are compared with numerical simulations which uses the...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||