Cálculo de tensiones en la superficie generalizada de recipientes a presión de composites: criterios de fallo

IX CONGRESO NACIONAL DE MATERIALES COMPUESTOS. Celebrado en Girona los días 5, 6, 7 y 8 de julio de 2011Se revisan las alternativas usadas, en el ámbito de los composites, para la determinación de las tensiones en puntos de la superficie generalizada de recipientes a presión de forma cilíndrica sometidos en exclusiva a la acción de sobrepresión interior. La revisión se complementa con la de los criterios de fallo empleados. Se comparan los resultados obtenidos para el campo de tensiones mediante: modelos analíticos simplificados (Teoría Clásica de Laminados y Cálculo de red), modelos analíticos generales (Formulación de Parnas-Lekhmitskii), modelos numéricos de softwares comerciales y medidas de laboratorio. La comparación de los criterios de fallo implica a los siguientes: Tsai-Hill, Tsai-Wu, Hoffman, Tensión máxima, Deformación máxima y AMS3 (AE). Se señalan los resultados consistentes entre todos los estudios, (ángulo óptimo de tejido y secuencias de apilado) y se evidencian y discuten aquéllos otros contradictorios, dando pie a nuevas líneas de trabaj

Human Rights and the Pink Tide in Latin America : Which Rights Matter?

Latin America witnessed the election of ‘new Left’ governments in the early 21 st century that, in different ways, sought to open a debate about alternatives to paradigms of neoliberal development. What has this meant for the way that human rights are understood and for patterns of human rights compliance? Using qualitative and quantitative evidence, this article discusses how human rights are imagined and the compliance records of new Left governments through the lens of the three ‘generations’ of human rights — political and civil, social and economic, and cultural and environmental rights. The authors draw in particular on evidence from Andean countries and the Southern Cone. While basic civil and individual liberties are still far from guaranteed, especially in the Andean region, new Left countries show better overall performances in relation to socio-economic rights compared to the past and to other Latin American countries. All new Left governments also demonstrate an increasing interest in ‘third generation’ (cultural and environmental) rights, though this is especially marked in the Andean Left. The authors discuss the tensions around interpretations and categories of human rights, reflect on the stagnation of first generation rights and note the difficulties associated with translating second and third generation rights into policy

Development of a software for calculation of optimised pressure vessels according to ASME X

The methodology for calculating pressure vessels made of composites is included at the Secion X of the ASME Code. These vessels are more common in aerospatial engineering, or in medical gas industry, but lately are being introduced in automotive, naval, energy and petrochemical industries. The development of a software tool to calculate pressure vessels according to ASME Code sec. X is proposed. Technically, the goal is to develop a software tool to aid in and speed up the process of designing pressure vessels according to the ASME Code Sec. X. With this software, and considering the entered data (diametres, lengths, design pressures, design temperatures, etc…), dimensions and final laminates of a pressure vessel can be obtained in order not to surpass the failure criteria for the considered composite

Actas del 3. congreso nacional de materiales compuestos

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai