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Author(s): |
Eduardo Leira Kruger
Total Authors: 1
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Document type: | Doctoral Thesis |
Press: | Campinas, SP. |
Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica |
Defense date: | 2009-11-30 |
Examining board members: |
Itamar Ferreira;
Ruis Camargo Tokimatsu;
Juno Gallego;
Cecília Amélia de Carvalho Zavaglia;
Celia Marina de Alvarenga Freire
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Advisor: | Itamar Ferreira |
Abstract | |
The classical Charpy test is used since 1900 and it is possible to determine from it the global energy for deformation and fracturing the specimen and this energy is named toughness which is important for selection steels considering ductile-brittle transition temperature. The Instrumented Charpy test is very important because it produces more material parameters, for example, the dynamic fracture toughness (KId), that can be used in Fracture Mechanics. However, there are several difficulties associated with the instrumentation of the impact machine ant processing digital signal, mainly in terms of the interpretation instrumented impact test results. The purpose of this work is to analyze the instrumentation system developed in accordance with normalization ISO 14556 (2000) to an Charpy machine and to determine and analyze the dynamic fracture toughness of the AISI 4340 steel in some metallurgical conditions obtained from treatment of quenching and tempering at 473K, 573K, 673K, and 773K. It was observed that the instrumentation system, the interpretation of the loads involved in the process of fracture and time to fracture are significant parameters in determining the dynamic fracture toughness. (AU) |