Estudo do comportamento em fadiga de baixo ciclo e fadiga sob cargas multiaxiais das ligas de alumínio AA6005, AA6063 e AA6351

Nascimento, Denise Ferreira Laurito

doi:10.11606/t.97.2015.tde-21052015-153422

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…Figure 6(b) shows a cycle of fluctuating stresses, in which the maximum and minimal stresses are different. Figure 6(c) illustrates a complicated stress cycle found in a material subject to unpredictable periodical overcharges, like in airplane wings exposed to air currents (NASCIMENTO, 2015). The main parameters of a stress cycle are: σ max -Higher algebraic value of the stress cycle; σ min -Lower algebraic value of the stress cycle; σ m -Medium value of the maximum and minimum stresses; σ r -Stresses interval; σ a -Cycle stress amplitude or alternating stress; R -Ratio between minimum and maximum stress.…”

Section: Thermal Fatigue In Moldsmentioning

confidence: 99%

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

Camargo

Romeiro

Moraes

2020

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The present article aimed to test changes in cooling water temperatures of males, present in aluminum injection molds, to reduce failures due to thermal fatigue. In order to carry out this work, cooling systems were studied, including their geometries, thermal gradients and the expected theoretical durability in relation to fatigue failure. The cooling system tests were developed with the aid of simulations in the ANSYS software and with fatigue calculations, using the method of Goodman. The study of the cooling system included its geometries, flow and temperature of this fluid. The results pointed to a significant increase in fatigue life of the mold component for the thermal conditions that were proposed, with a significant increase in the number of cycles, to happen failures due to thermal fatigue.

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Section: Thermal Fatigue In Moldsmentioning

confidence: 99%

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

Camargo

Romeiro

Moraes

2020

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“…Series 6XXX aluminum alloys show good corrosion resistance and weldability, and are often selected for applications where the structure is able to sustain occasional strikes or overloads due to their high resilience and fatigue resistance. They are employed in bus and truck bodies, structural engineering, towers, oil platforms and pipelines [7]. The aim of the present work is to assess the propagation of fatigue cracks in AA6005 extruded plate specimens under pulsating tension (R = 0) and fully reversed (R = -1) constant amplitude cyclic loadings.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth in an Al-Mg-Si Alloy under Negative Load Ratio

Torres

Silva

Costa

et al. 2017

KEM

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The usual approaches for Fatigue Crack Growth (FCG) assessment are based on semi-empirical models that consider the stress intensity factor range of fracture mechanics, ΔK, as the governing driving force for crack propagation. However, FCG data incorporating compressive loads have brought discussions and controversies. The compressive loads are not taken into account in the usual life prediction codes and the negative portion of the loading cycle is neglected. In the present work, constant amplitude fatigue crack growth tests with load ratios-1 and 0 are performed, for two diferent stess levels, in AA 6005 alloy centre-notched middle tension M(T) specimens and the obtained results are discussed. It is shown that the crack closure concept, that usually work well for positive ratios, is not enough to satisfactorily explain the negative load ratio effects. The results also showed how the negative part of the load affected the propagation rate of the crack, mainly for larger cracks and smaller loads. Finally, it is shown that a previously proposed expression for the stress distribution ahead of the crack can shed some light on this question.

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“…4.2. A média dos dois valores medidos para esta liga AA6351 é similar aos resultados obtidos por Nascimento [43], SE = 331 MPa e SR = 354 MPa.…”

Section: Figura 4-1 -Tensão Versus Deformação [35]unclassified

Previsão Da Tolerância Às Trincas Curtas Que Nascem De Entalhes

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Estudo do comportamento em fadiga de baixo ciclo e fadiga sob cargas multiaxiais das ligas de alumínio AA6005, AA6063 e AA6351

Abstract: RESUMO NASCIMENTO, D. F. L. Estudo do comportamento em fadiga de baixo ciclo e fadiga sob cargas multiaxiais das ligas de alumínio AA6005, AA6063 e AA6351. 2015. 205p.

Cited by 3 publications

References 33 publications

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

Fatigue Crack Growth in an Al-Mg-Si Alloy under Negative Load Ratio

Previsão Da Tolerância Às Trincas Curtas Que Nascem De Entalhes

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