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[en] PHOTOELASTIC DETERMINATION OF STRESS INTENSITY FACTORS FOR CRACKS NEAR WELD-JOINTS IN PLANE BARS AND TUBULAR SPECIMENS / [pt] FATORES DE INTENSIDADE DE TENSÕES PARA TRINCAS PRÓXIMAS A JUNTAS SOLDADAS PLANAS E TUBULARES VIA FOTOELASTICIDADE

[pt] O presente trabalho visa determinar, experimentalmente,Fatores de Intensidade de Tensões, KI e KII em barras e tubos, submetidos à tração, com trincas situadas:
I) Junto ao pé do cordão de solda em barras planas soldadas ortogonalmente com relações comprimento de trinca, a, largura da barra, B, a/B igual a 0,1 e a/B igual a 0,2.
II) Próximo à raiz da solda em tubos unidos a 90 graus com relações comprimento de trinca, espessura do tubo principal, t, a/t igual a 0,1; a/t igual a 0,2; a/t igual a 0,3.
III) Barras e tubos simples (sem uniões soldadas) tendo as relações a/B igual a 0,1; 0,2; 0,3 e a/t igual a 0,1; 0,2; 0,25 e 0,3.
Nos modelos planos, foi feito um estudo comparativo entre espécimes que possuíam entalhes usinados para simular as trincas e espécimes onde forma propagadas trincas de fadiga.
Os resultados para as barras forma obtidos utilizando-se a técnica fotoelástica bidimensional e para os tubos, o método tridimensional de congelamento de tensões e corte em fatias. Nas barras os dados coletados foram submetidos aos programas CRACK e FLAW, e nos tubos, apenas ao programa FLAW, para determinação dos valores de KI e KII. / [en] This work aims to determine Stress Intensity Factors KI and KII for bars and tubes loaded in tension with the following geometry:
I) T Join bars with cracks located near the weld toe. Relations between crack length, a, and bar width, B, were: a/B equal 0.05; a/B equal 0.1 a/B equal 0.2.
II) Tubes with T joints with cracks located at the weld toe. The relations between crack length and tube thickness, t, were: a/t equal 0.1; a/t equal 0.2 and a/t equal 0.3.
III) Plains bars with ratios a/B equal 0.05; a/B equal 0.1 and a/B equal 0.2.
IV) Plains tubes with ratios a/t of 0.1, 0.2, 0.25 and 0.3.
A comparative study was made between plane models that had artificial machined cracks and those that had natural fatigue cracks.
Results for bars were obtained employing two-dimensional Photoelasticity technique and for tubes, the three-dimensional stress freezing and slicing method was used. To generate KI and KII, the collected data were submitted to FLAW and CRACK computer programs in the case of bars, while for tubes, only the FLAW program was used.

Identiferoai:union.ndltd.org:puc-rio.br/oai:MAXWELL.puc-rio.br:20619
Date25 October 2012
CreatorsJOSE RICARDO REBELLO
ContributorsJOSE LUIZ DE FRANCA FREIRE
PublisherMAXWELL
Source SetsPUC Rio
LanguagePortuguese
Detected LanguageEnglish
TypeTEXTO

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