Modified Low Cycle Method as a New Criterion for a Life Fatigue Assessment in Foundry Industry

Maj, M.; Pietrzak, K.; Piekło, J.

doi:10.2478/amm-2013-0091

Cited by 5 publications

(7 citation statements)

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“…In order to determine several mechanical properties, the modified low-cycle fatigue test (MLCF) was applied. This method description oriented towards problems concerning foundry alloys and their theoretical bases is presented in [13]. An example of this method of application in analyzing the casting of an automotive vehicle suspension (a so-called "rocker" made of an AlZnMgCu alloy) that allowed us to determine Parameters b and c resulting from the Manson-Coffin-Morrow dependence can be found in [14]:…”

Section: Modified Low-cycle Fatigue Testmentioning

confidence: 99%

Archives of Metallurgy and Materials

Zych¹,

Piekło²,

Maj³

et al. 2019

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Fatigue investigations of two 4XXX0-series aluminum alloys (acc. PN-EN 1706) within a range of fewer than 10 4 cycles at a coefficient of cycle asymmetry of R = -1 were performed in the current paper. The so-called modified low-cycle test, which provided additional information concerning the fatigue life and strength of the tested alloys, was also performed. The obtained results were presented in the form of diagrams: stress amplitude σ a -number of cycles before damage N. On the basis of the microscopic images of sample fractures, the influence of the observed casting defects on the decrease of cycle numbers at a given level of stress amplitude were analyzed. Based on the images and dimensions of the observed defects, stress intensity factor K I was analytically determined for each. Their numerical models were also made, and stress intensity factor K I was calculated by the finite element method (FEM).

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Section: Modified Low-cycle Fatigue Testmentioning

confidence: 99%

Archives of Metallurgy and Materials

Zych¹,

Piekło²,

Maj³

et al. 2019

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“…5. The curve for fatigue strength determination [15] The determination of fatigue parameters b, c, n ', K and max was based on the following assumptions [15] • the assessment of the fatigue strength during rotary bending is carried out in accordance with [15,16].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…This article discusses the effect of tenfold direct remelting of the A359 alloy-based composite reinforced in the whole volume with 20wt% Al2O3 particles on both the microstructure (qualitative and quantitative assessment) and fatigue life. In the assessment of fatigue life, the authors used a modified low-cycle fatigue method (MLCF) [15,16], particularly useful for quick estimation of fatigue parameters in the case of heterogeneous microstructures.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Klasik¹,

Maj²,

Pietrzak³

et al. 2018

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The multiple direct remelting of composites based on the A359 alloy reinforced with 20% of Al2O3 particles was performed. The results of both gravity casting and squeeze casting were examined in terms of the obtained microstructure and mechanical characteristics. In microstructure examinations, the combinatorial method based on phase quanta theory was used. In mechanical tests, the modified low cycle fatigue method (MLCF) was applied. The effects obtained after both gravity casting and squeeze casting were compared. It was noted that both characteristics were gradually deteriorating up to the tenth remelting. The main cause was the occurrence of shrinkage porosity after the gravity casting. Much better results were obtained applying the squeeze casting process. The results of microstructure examinations and fatigue tests enabled drawing the conclusion that the A359 alloy reinforced with Al2O3 particles can confer a much better fatigue life behavior to the resulting composite than the A359 alloy without the reinforcement. At the same time, comparing these results with the results of the previous own research carried out on the composites based also on the A359 alloy but reinforced in the whole volume with SiC particles, it has been concluded that both types of the composites can be subjected to multiple remelting without any significant deterioration of the structural and mechanical characteristics. The concepts and advantages of using the combinatorial and MLCF methods in materials research were also presented

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“…The mechanical properties were evaluated on the basis of strength tests both in the static tensile test as well as in the modified low cycle fatigue. [9], [10], [11] …”

Section: Methodsmentioning

confidence: 99%

The Influence of the Microporosity on the Mechanical Properties of the AlZnMgCu Alloy, Based on the Numerical Analysis and Laboratory Trials

Pysz¹,

Żuczek²,

Piekło³

et al. 2017

Archives of Foundry Engineering

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The ecological meanings clearly indicates the need of reducing of the concentration of the CO 2 in the atmosphere, which can be accomplished through the lowering of the fuel consumption. This fact implies the research for the new construction solutions regarding the reduction of the weight of vehicles. The reduced weight of the vehicle is also important in the case of application of the alternative propulsion, to extend the lifetime of the batteries with the reduction of recharge cycles. The use of cast alloy AlZnMgCu compliant of plastic forming class 7xxx alloy, are intended to significantly reduce the weight of the structures, while ensuring high strength properties. The wide range of the solidification temperature, which is more than 150°C, characterizes this alloy with a high tendency to create the micro and macro porosity. The study presents the relationship between the cooling rate and the area of occurrence and percentage of microporosity. Then the results were linked to the local tensile strength predicted in the simulation analysis. The evaluation of the microporosity was performed on the basis of the CT (computed tomography) and the analysis of the alloy microstructure. The microstructure analysis was carried out on test specimen obtained from the varying wall thickness of the experimental casting. The evaluation of the mechanical properties was prepared on the basis of the static tensile test and the modified low cycle fatigue test (MLCF).

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Modified Low Cycle Method as a New Criterion for a Life Fatigue Assessment in Foundry Industry

Cited by 5 publications

References 0 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Archives of Foundry Engineering

The Influence of the Microporosity on the Mechanical Properties of the AlZnMgCu Alloy, Based on the Numerical Analysis and Laboratory Trials

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