Banca de DEFESA: PEDRO SABÓIA RIBEIRO DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : PEDRO SABÓIA RIBEIRO DE SOUZA
DATA : 11/12/2019
HORA: 13:00
LOCAL: Auditório Magno Valente da Escola Politécnica da UFBA
TÍTULO:

Evaluation of the computational methods applied to the design of the industrial valves body and bonnet, in light of ASME Section VIII Division 2 Part 5.

PALAVRAS-CHAVES:

Valves, ASME Section VIII Division 2, Finite Elements, Design by Analysis, Stress Linearization, Inelastic Analysis

PÁGINAS: 148
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Mecânica
SUBÁREA: Mecânica dos Sólidos
ESPECIALIDADE: Mecânica dos Corpos Sólidos, Elásticos e Plásticos
RESUMO:

Industrial valves are complexly manufactured products, featuring a wide variety of design combinations involving different materials, geometric shapes, seals and mechanical drive assemblies. With regard to the design of the body and bonnet of the equipment, NBR 15827 reference the American Standard ASME Section VIII Division 2. The elastic analyzes currently available in the ASME standard, have limitations in their use. These limitations are mainly associated with the need of Stress Linearization method when using solid finite elements in the modeling of complex geometry and thick wall equipment. When such limitations are identified, the use of inelastic limit load and elastoplastic analysis methods is recommended. The guidelines for inelastic analysis, presented in ASME Section VIII Division 2 Part 5, are global and do not address the particularities that should be observed in the formulation of the model and interpretation of the results obtained. Another point of uncertainty is related to the choice of using limit load or elastoplastic analysis, whether one can be used instead of the other, if they are complementary or if the application of these methods also has some limitation. In this work, the main computational methods used for the project development by analysis of the body and bonnet of industrial valves were evaluated, with the objective of identifying the applicability and limitations of these methods, from a critical evaluation of the recommendations present in the codes and literature. As a result, it was found that the use of Stress Linearization for thick-walled vessels may cause risks to the equipment design, especially regarding the interpretation of the peak stress values obtained in the analyzes. In the evaluation of inelastic methods, it was found that such methods, are able to bring more rationality to the design of the valve body and bonnet. In this context, a comparison was also made between the results obtained in the limit load analysis and the elastoplastic analysis, showing that the choice of one of these methods should be made, not only to achieve higher operating pressure values, but also to assess the service operability, especially regarding the deformations obtained in these analysis.

MEMBROS DA BANCA:
Interno - 2196670 - ARMANDO SA RIBEIRO JUNIOR
Interno - 465.982.515-91 - GERALDO JOSÉ BELMONTE DOS SANTOS - LNCC
Externo à Instituição - FLÁVIO PIETROBON COSTA - UNEB