Buscar
Mostrando ítems 1-10 de 22
Inter-relationships among elastic constants for symmetrical or unsymmetrical laminates with cracked 90-plies
(Taylor & Francis, 2020-02-22)
The relations between the stiffness components of a symmetrical or unsymmetrical laminate having trans-verse matrix cracks only in the 90-degree laminas are explored in this work. The crack closure condition for these ...
Inter-relationships among stiffness matrix components for general laminates with transverse cracks in oblique plies
(Springer, 2019-02-28)
In this paper, nine inter-relationships linking the stiffness matrix components of symmetrical or unsymmetrical laminates having transverse matrix cracks in some of the off-axis plies is presented. The crack closure condition ...
Three-dimensional boundary element assessment of a fibre/matrix interface crack under transverse loading
(Elsevier, 2005-02-05)
The macroscopic behaviour of unidirectional fibre-reinforced-composite materials is strongly dependent on the strength of the fibre/matrix adhesion. The stress concentrations around the fibres lead to micro-crack initiation, ...
Evaluation of cross-ply laminate stiffness with a non-uniform distribution of transverse matrix cracks by means of a computational meso-mechanic model
(Elsevier, 2018-02)
This work addresses the evaluation of the stiffness of fiber-reinforced composite laminates, by means of a computational meso-mechanic model, considering two non-uniformly spaced transverse matrix cracks. Laminates with ...
Fracture toughness of a directionally solidified Al-Nb-Ni ternary eutectic
(Elsevier Sci LtdOxfordInglaterra, 2012)
Análise por elementos finitos da influência de descontinuidades geométricas sobre o comportamento dinâmico de rotores flexíveis.
(Universidade Federal de Minas GeraisUFMG, 2007-06-29)
This work deals with a finite element analysis of the dynamic behavior of cracked flexible rotors supported by hydrodynamic journal bearing. Geometric discontinuities such as cracks, holes, undercuts, etc. can strongly ...
Experimental verification of Hudson and Eshelby-Chen’s effective crack theory
(Universidade Federal do ParáBrasilInstituto de GeociênciasUFPAPrograma de Pós-Graduação em Geofísica, 2019)
Verificação experimental do modelo efetivo de Hudson-Crampin para meios anisotrópicos fissurados cujo o meio de fundo apresenta isotropia transversal
(Universidade Federal do ParáBrasilInstituto de GeociênciasUFPAPrograma de Pós-Graduação em Geofísica, 2019)
Estudo do mecanismo de formação de lascamento em cilindros primeiro intermediärios utilizados em laminadores sendzimir
(Universidade Federal de Minas GeraisUFMG, 2015-03-20)
In this work, the causes of failure in the first intermediate rolls used in Sendzimir rolling mills were studied. Samples of two rolls from different suppliers were analyzed. They had similar chemical composition (0.8% C, ...
Detección de daño estructural utilizando modelo extendido de rotor fisurado tipo Jeffcott validado con test de laboratorio
(2018-10-01)
RESUMEN:
El presente trabajo de tesis se centra en generar una herramienta de diagnóstico de daño en rotores de turbomaquinaria basada en un modelo de vibración y en un identificador basado en el cálculo de frecuencias ...