Fatigue strength of tungsten inert gas-repaired weld joints in airplane critical structures

Nascimento, Marcelino P.; Voorwald, Herman Jacobus Cornelis; Filho, João da Cruz Payão

doi:10.1016/j.jmatprotec.2011.01.016

Cited by 26 publications

(11 citation statements)

References 27 publications

(37 reference statements)

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“…The fatigue strengths of bcc metals usually approach their yield strengths, even for relatively high–yield strength materials. As an example, bcc steels and eutectoid steels are known to display high fatigue strength ( 38 ) in addition to their high yield or tensile strength. The fatigue properties we report for a list of bcc alloys and metals ( 39 , 40 ) (Fig.…”

Section: Slip Localization For Fatigue Strength Predictionmentioning

confidence: 99%

On the origins of fatigue strength in crystalline metallic materials

Stinville

Charpagne

Cervellon

et al. 2022

Science

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Metallic materials experience irreversible deformation with increasing applied stress, manifested in localized slip events that result in fatigue failure upon repeated cycling. We discerned the physical origins of fatigue strength in a large set of face-centered cubic, hexagonal close-packed, and body-centered cubic metallic materials by considering cyclic deformation processes at nanometer resolution over large volumes of individual materials at the earliest stages of cycling. We identified quantitative relations between the yield strength and the ultimate tensile strength, fatigue strength, and physical characteristics of early slip localization events. The fatigue strength of metallic alloys that deform by slip could be predicted by the amplitude of slip localization during the first cycle of loading. Our observations provide a physical basis for well-known empirical fatigue laws and enable a rapid method of predicting fatigue strength as reflected by measurement of slip localization amplitude.

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Section: Slip Localization For Fatigue Strength Predictionmentioning

confidence: 99%

On the origins of fatigue strength in crystalline metallic materials

Stinville

Charpagne

Cervellon

et al. 2022

Science

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“…Accurate assessment of fatigue life can be carried out by the strain-life approach as it considers the plastic-forming events existing in the local area. This strain-life approach is generally used for ductile materials; as a low cycle fatigue of the smaller components [12][13][14] (within 10 3 cycles) [15][16][17], do not need extensive crack observations or high operational costs for their failure. Fatigue behavior of engineering materials is very sensitive to mean stress, geometric design, surface effect, metallic variables and environment [18].…”

Section: Fatigue Damagementioning

confidence: 99%

Fatigue Feature Clustering of Modified Automotive Strain Signals for Saving Testing Time

Husaini¹,

Putra²,

Ali³

2018

Int. J. Automot. Mech. Eng.

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This paper discusses on the clustering of damaging fragments from a fatigue data editing leading to fatigue damage using the fuzzy C-means. In this work, strain signals were measured from an automotive coil spring which involved vehicle movements on three types of road surfaces at different speeds. Next, the extractions of higher amplitude cycle utilising the wavelet transform were conducted. From the results, it was obtained that the transformation was able to shorten the strain signal time up to 81.5 % removing 81.5 % of lower amplitude cycles, which these cycles theoretically contribute to minimum fatigue damage. Therefore, retaining of fatigue damage by more than 90.4 % was obtained. Furthermore, the resulted fragments from the extraction processes had been clustered utilising the fuzzy C-means, providing a significant coefficient of determination, reaching 0.9036. The testing time was successfully decreased up to 81.4 % using the edited strain signals. In conclusion, the technique could be successfully used to shorten a strain signal without changing the main history.

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“…Ghosh (2003) verificou a influência do pré e do pós-aquecimento na soldagem de aço Cr-Mo aplicando os processos SMAW (Shilded Metal arcWelding) e GTAW, realizando testes em várias temperaturas. O pós-aquecimento melhorou as propriedades, ao que indica até certa temperatura, o teste realizado a 800º diminuiu a resistência mecânica causando trincas/fraturas durante o ensaio de tração [12].…”

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Soldagem Gtaw Do Aço Sae 4130: Influência Do Pré-Aquecimento

Siman¹,

Paixão²,

Cardoso³

et al. 2017

Anais Do Congresso Anual Da ABM

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Resumo A soldagem GTAW tem importância fundamental para a indústria não só pelo excelente controle do aporte térmico, como também ao fato de proporcionar, repetitividade e reprodutibilidade. No entanto, este apresenta uma série de desafios, principalmente em relação à determinação de algumas variáveis e como essas podem afetar a resistência das juntas soldadas. Neste trabalho, investigou-se a influência de diferentes procedimentos de soldagem em tubos de aço SAE 4130 sem costura com e sem a deposição e com a aplicação ou não de pré-aquecimento. Após procedimentos de soldagem, as propriedades mecânicas e a microestrutura da junta soldada, zona fundida, zona termicamente afetada e metal base, foram avaliadas por meio de ensaios de microdureza, de dobramento e análise metalográfica. Foi possível avaliar a influência da aplicação do pré-aquecimento e analisar as propriedades mecânicas e microestrutura das juntas soldadas. Os perfis de microdureza revelaram a importância do pré-aquecimento. O ensaio de dobramento possibilitou a avaliação das juntas de maneira qualitativa. Porém, um ensaio quantitativo, como o de tração, possibilitaria mais informações. Palavras-chave:Soldagem GTAW, Soldagem TIG, soldagem do aço SAE4130 GÁS METAL ARC WELDING OF THE STEEL SAE 4130:INFLUENCE OF THE PRE-HEATING Abstract GTAW process has a fundamental importance in the industry, not only because its excellent thermal input control, but also because its proceeds the welding providing repeatability and reproducibility. However, this still presents many challenges. Mainly in the determination of the welding parameters and how these can influence the welded joints resistance. In this work, we investigated the different welding procedures influence on SAE 4130 steel pipes with or without deposited material and with or without preheating. In this context, after welding procedures the mechanical properties and the microstructure of the welded joint, fusion zone, Heat-Affected Zone and base metal, were evaluated by microhardness tests, folding and metallographic analysis. The preheating influence on the joint was evaluated as well as the mechanical and microstructural properties. The results indicate that this procedure significantly influenced the final properties of the welded joint. The folding test allowed the evaluation of joints in a qualitative way. However, a quantitative test, such as traction, would provide more information.

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Fatigue strength of tungsten inert gas-repaired weld joints in airplane critical structures

Cited by 26 publications

References 27 publications

On the origins of fatigue strength in crystalline metallic materials

On the origins of fatigue strength in crystalline metallic materials

Fatigue Feature Clustering of Modified Automotive Strain Signals for Saving Testing Time

Soldagem Gtaw Do Aço Sae 4130: Influência Do Pré-Aquecimento

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