Published February 1983 | Version v1
Journal article Metadata-only

On the thermally activated crack propagation in alumina

Creators

  • 1. Instituto Militar de Engenharia, Rio de Janeiro (Brazil). Secao de Engenharia e Ciencia dos Materiais

Description

Subcritical crack growth was studied in the temperature 25-1000C in two commercial aluminas containing different amounts of a glassy phase. The experimental method employed was that of double torsion under constant load, using a device specially built to carry out mechanical tests at constant compressive load and high temperatures. Activation enthalpies of subcritical crack growth were determined for the two materials. (Author)

Abstract (Portuguese)

Estuda-se a propagacao subcritica de trincas nas temperaturas 25-1000C em duas aluminas comerciais contendo diferentes quantidades de fase vitrea. Usou-se o metodo experimental da torcao dupla sob carga constante, usando um aparelho especialmente construido para fazer os testes mecanicos a carga compressiva constante e alta temperatura. Determinou-se para dois materiais a entalpia de ativacao da propagacao subcritica de trincas. Desenvolveu-e um modelo cinetico-termodinamico para descrever os resultados quantitativamente. (E.G.)

Additional details

Additional titles

Original title (Portuguese)
Sobre a propagacao termicamente ativada de trincas na alumina

Publishing Information

Journal Title
Ceramica (Sao Paulo)
Journal Volume
29
Journal Issue
158
Series
Ceramica (Sao Paulo).
Journal Page Range
51-58
ISSN
0366-6913

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
16023682
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ALUMINIUM OXIDES; CERAMICS; CRACK PROPAGATION; CRACKS; MEDIUM TEMPERATURE; TEMPERATURE DEPENDENCE
Descriptors DEC
ALUMINIUM COMPOUNDS; CHALCOGENIDES; OXIDES; OXYGEN COMPOUNDS