Nuevo Impulso a La Distribucion Del Fondo Editorial De La Unam
CON EL FIN DE INSTRUMENTAR LA DISTRIBUCION Y VENTA DE LA PRODUCCION EDITORIAL DE LA UNAM EN AMERI... more CON EL FIN DE INSTRUMENTAR LA DISTRIBUCION Y VENTA DE LA PRODUCCION EDITORIAL DE LA UNAM EN AMERICA LATINA, LA MAXIMA CASA DE ESTUDIOS DEL PAIS SUSCRIBIO UN CONVENIO DE COLABORACION CON LA COMPANIA EXPORTADORA MEXICANA, S.A. DE C.V. (EXMEX), EN VIRTUD DEL CUAL LA UNIVERSIDAD SE COMPROMETE A CONCEDER UN 45 POR CIENTO DE DESCUENTO SOBRE EL PRECIO DE LISTA A DICHA COMPANIA EXPORTADORA, MIENTRAS QUE ESTA QUEDARIA OBLIGADA A DISTRIBUIR EL MATERIAL BIBLIOGRAFICO EN EL EXTRANJERO CUBRIENDO LOS GASTOS DE EXPORTACION. RUBRICARON EL ARQUITECTO JORGE FERNANDEZ VARELA, COORDINADOR DE EXTENSION UNIVERSITARIA POR LA UNAM, Y EL DIRECTOR DE EXAMEX, JULIO FAESLER, EN REPRESENTACION DE ESA EMPRESA.
Universitarios Que Trabajan en El Imce Entregaron a La Unam Aportaciones Economicas
LA APORTACIONES DE LOS PROFESORES EGRESADOS DE LA UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO QUSE PR... more LA APORTACIONES DE LOS PROFESORES EGRESADOS DE LA UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO QUSE PRESTAN SUS SERVICIOS EN EL INSTITUTO MEXICANO DE COMERCIO EXTERIOR, REUNIDAS EN UN CHEQUE DE TREINTA MIL PESOS, FUERON ENTREGADAS POR EL LICENCIADO JULIO FAESLER, DIRECTOR GENERAL DEL INSTITUTO MEXICANO DE COMERCIO EXTERIOR, AL DOCTOR GUILLERMO SOBERON, RECTOR DE LA UNAM. DURANTE EL ACTO QUE SE LLEVO A CABO A LAS 11:00 HORAS EN EL SALON SOR JUANA, DEL SEXTO PISO DE RECTORIA, EL LICENCIADO FAESLER DIJO: "LOS UNIVERSITARIOS QUE PRESTAMOS NUETROS SERVICIOS EN EL IMCE, HEMOS ESTIMADO QUE ES OBLIGACION PARA LA CON LA INSTITUCION QUE NOS DIO PROFESION... MEJORAR SU PATRIMONIO ECONOMICO Y, POR LO MISMO, LOGRAR UN PROGRESO QUE SEA EN BENEFICIO DE TODOS LOS MEXICANOS."
sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delh... more sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delhi, India, la Segunda Conferencia con el objeto de tratar de llegar a entendimientos claros y efectivos, sobre medidas de acción específicas en materia de cooperación internacional en favor del desenvolvimiento económico de los países en desarrollo.
sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delh... more sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delhi, India, la Segunda Conferencia con el objeto de tratar de llegar a entendimientos claros y efectivos, sobre medidas de acción específicas en materia de cooperación internacional en favor del desenvolvimiento económico de los países en desarrollo.
This work presents an investigation of strain rate effects on the elastic, plastic and strength p... more This work presents an investigation of strain rate effects on the elastic, plastic and strength properties of unidirectional carbon-epoxy composites. The split-Hopkinson pressure bar was used for the high strain rate tests and optimised for composites by means of systematic pulse shaping and direct strain measurements on the specimen, using foil strain gauges or the contactless optical method of digital image correlation. All high strain rate tests were performed under dynamic stress equilibrium and at near constant strain rates. As a result is was possible to obtain both reliable elastic and strength properties from the measured dynamic stress-strain response. For the carbon-epoxy material system IM7-8552, quasi-static and high strain rate experiments were performed in the longitudinal and transverse compressive direction. A test fixture was developed for the longitudinal compression tests, which allows an interference free strain wave propagation when used for the split-Hopkinson pressure experiment. The strain rate effect on the material response under combined transverse compression and in-plane shear loading was investigated by means of off-axis compression tests. From the latter tests, the quasi-static and dynamic in-plane shear response was determined and the yield strength and failure envelopes for combined transverse compression and in-plane shear loading were established and compared with a state-of-the-art failure criterion. High speed photography was used to study the fracture mode under dynamic loading, and to determine the fracture plane angle for pure transverse compression and for various ratios of transverse compression and in-plane shear. At the strain rates studied in this work, no strain rate effect was observed for the longitudinal compressive modulus, whereas a moderate and consistent increase, with increasing loading rate, was found for the transverse compressive, in-plane shear and off-axis compressive moduli. More significant and again consistent strain rate effects were observed for the longitudinal compressive strength, and for the transverse compressive, in-plane shear and off-axis compressive yield and failure strengths. Quasi-static off-axis tension tests were performed to investigate the constitutive response and to determine the failure envelope for combined transverse tension and in-plane shear loading. As for the compression tests, the experimental failure envelope was compared with advanced failure criteria. A simple plasticity model for unidirectional polymer composites is introduced and it is shown how the plasticity model parameters can be determined from the off-axis compression and tension tests performed in this study. The plasticity model and a state-of-the-art failure criteria were implemented into an ABAQUS VUMAT user-material subroutine. By comparing the predicted and experimental stress-strain curves, it is shown that the implemented model and failure criteria can accurately predict the constitutive behaviour of unidirectional polymer composites for both quasi-static and high strain rates.
Nuevo Impulso a La Distribucion Del Fondo Editorial De La Unam
CON EL FIN DE INSTRUMENTAR LA DISTRIBUCION Y VENTA DE LA PRODUCCION EDITORIAL DE LA UNAM EN AMERI... more CON EL FIN DE INSTRUMENTAR LA DISTRIBUCION Y VENTA DE LA PRODUCCION EDITORIAL DE LA UNAM EN AMERICA LATINA, LA MAXIMA CASA DE ESTUDIOS DEL PAIS SUSCRIBIO UN CONVENIO DE COLABORACION CON LA COMPANIA EXPORTADORA MEXICANA, S.A. DE C.V. (EXMEX), EN VIRTUD DEL CUAL LA UNIVERSIDAD SE COMPROMETE A CONCEDER UN 45 POR CIENTO DE DESCUENTO SOBRE EL PRECIO DE LISTA A DICHA COMPANIA EXPORTADORA, MIENTRAS QUE ESTA QUEDARIA OBLIGADA A DISTRIBUIR EL MATERIAL BIBLIOGRAFICO EN EL EXTRANJERO CUBRIENDO LOS GASTOS DE EXPORTACION. RUBRICARON EL ARQUITECTO JORGE FERNANDEZ VARELA, COORDINADOR DE EXTENSION UNIVERSITARIA POR LA UNAM, Y EL DIRECTOR DE EXAMEX, JULIO FAESLER, EN REPRESENTACION DE ESA EMPRESA.
Universitarios Que Trabajan en El Imce Entregaron a La Unam Aportaciones Economicas
LA APORTACIONES DE LOS PROFESORES EGRESADOS DE LA UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO QUSE PR... more LA APORTACIONES DE LOS PROFESORES EGRESADOS DE LA UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO QUSE PRESTAN SUS SERVICIOS EN EL INSTITUTO MEXICANO DE COMERCIO EXTERIOR, REUNIDAS EN UN CHEQUE DE TREINTA MIL PESOS, FUERON ENTREGADAS POR EL LICENCIADO JULIO FAESLER, DIRECTOR GENERAL DEL INSTITUTO MEXICANO DE COMERCIO EXTERIOR, AL DOCTOR GUILLERMO SOBERON, RECTOR DE LA UNAM. DURANTE EL ACTO QUE SE LLEVO A CABO A LAS 11:00 HORAS EN EL SALON SOR JUANA, DEL SEXTO PISO DE RECTORIA, EL LICENCIADO FAESLER DIJO: "LOS UNIVERSITARIOS QUE PRESTAMOS NUETROS SERVICIOS EN EL IMCE, HEMOS ESTIMADO QUE ES OBLIGACION PARA LA CON LA INSTITUCION QUE NOS DIO PROFESION... MEJORAR SU PATRIMONIO ECONOMICO Y, POR LO MISMO, LOGRAR UN PROGRESO QUE SEA EN BENEFICIO DE TODOS LOS MEXICANOS."
sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delh... more sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delhi, India, la Segunda Conferencia con el objeto de tratar de llegar a entendimientos claros y efectivos, sobre medidas de acción específicas en materia de cooperación internacional en favor del desenvolvimiento económico de los países en desarrollo.
sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delh... more sobre el Comercio y el Desarrollo (UNCTAD), 132 países se dieron cita para celebrar en Nueva Delhi, India, la Segunda Conferencia con el objeto de tratar de llegar a entendimientos claros y efectivos, sobre medidas de acción específicas en materia de cooperación internacional en favor del desenvolvimiento económico de los países en desarrollo.
This work presents an investigation of strain rate effects on the elastic, plastic and strength p... more This work presents an investigation of strain rate effects on the elastic, plastic and strength properties of unidirectional carbon-epoxy composites. The split-Hopkinson pressure bar was used for the high strain rate tests and optimised for composites by means of systematic pulse shaping and direct strain measurements on the specimen, using foil strain gauges or the contactless optical method of digital image correlation. All high strain rate tests were performed under dynamic stress equilibrium and at near constant strain rates. As a result is was possible to obtain both reliable elastic and strength properties from the measured dynamic stress-strain response. For the carbon-epoxy material system IM7-8552, quasi-static and high strain rate experiments were performed in the longitudinal and transverse compressive direction. A test fixture was developed for the longitudinal compression tests, which allows an interference free strain wave propagation when used for the split-Hopkinson pressure experiment. The strain rate effect on the material response under combined transverse compression and in-plane shear loading was investigated by means of off-axis compression tests. From the latter tests, the quasi-static and dynamic in-plane shear response was determined and the yield strength and failure envelopes for combined transverse compression and in-plane shear loading were established and compared with a state-of-the-art failure criterion. High speed photography was used to study the fracture mode under dynamic loading, and to determine the fracture plane angle for pure transverse compression and for various ratios of transverse compression and in-plane shear. At the strain rates studied in this work, no strain rate effect was observed for the longitudinal compressive modulus, whereas a moderate and consistent increase, with increasing loading rate, was found for the transverse compressive, in-plane shear and off-axis compressive moduli. More significant and again consistent strain rate effects were observed for the longitudinal compressive strength, and for the transverse compressive, in-plane shear and off-axis compressive yield and failure strengths. Quasi-static off-axis tension tests were performed to investigate the constitutive response and to determine the failure envelope for combined transverse tension and in-plane shear loading. As for the compression tests, the experimental failure envelope was compared with advanced failure criteria. A simple plasticity model for unidirectional polymer composites is introduced and it is shown how the plasticity model parameters can be determined from the off-axis compression and tension tests performed in this study. The plasticity model and a state-of-the-art failure criteria were implemented into an ABAQUS VUMAT user-material subroutine. By comparing the predicted and experimental stress-strain curves, it is shown that the implemented model and failure criteria can accurately predict the constitutive behaviour of unidirectional polymer composites for both quasi-static and high strain rates.
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Papers by Julio Faesler