Project/scholarship details

  • Funder

    FCT - Fundação para a Ciência e a Tecnologia, I.P.

  • Funder's country

    Portugal

  • Funding program

    5876-PPCDTI

  • Funding amount

    48,000.00 €

  • Start date

    2011-04-01

  • End date

    2014-03-31

Documents

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A parameter for quantitative analysis of plasticity induced crack closure

Antunes, F.V.; Correia, L.; Ramalho, A.L.

Numerical models have been successfully developed to predict plasticity induced crack closure (PICC). However, despite the large research effort a full understanding of the links between physical parameters, residual plastic wake and PICC has not been achieved yet. The plastic extension of material behind crack tip, Dyp, obtained by the integration of vertical plastic deformation perpendicularly to crack flank,...

Date: 2015   |   Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
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Effect of crack closure on non-linear crack tip parameters

Antunes, F.V.; Sousa, T.; Branco, R.; Correia, L.

Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, some authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and wit...

Date: 2015   |   Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
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Effect of compressive loads on plasticity induced crack closure

Antunes, F. V.; Correia, L.; Camas, D.; Branco, R.

Compressive stresses play an important role on tension-compression fatigue which can be attributed to plasticity induced crack closure (PICC). The objective here is to study numerically the effect of compressive stresses on PICC and to discuss the applicability of PICC to explain the effect of negative stress ratios on fatigue crack growth rate. The compression produces reversed plastic deformation at the crack...

Date: 2015   |   Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
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Previsão da Vida de Propagação à Fadiga

Correia, Luís Miguel Pedroso de Moura

Tese de doutoramento em Engenharia Mecânica, no ramo de Integridade Estrutural, apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra; A fadiga é responsável pela maioria das falhas em componentes e estruturas solicitadas ciclicamente. Este dano dos materiais compreende as fases de iniciação e de propagação de fenda. No âmbito da propagação, o fenómeno de fecho de fenda é um mecanismo extr...

Date: 2018   |   Origin: Estudo Geral - Universidade de Coimbra
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