Fatigue Crack Growth in Fe Mini-Samples Consolidated by Means of Impact Sintering

Tomasz Brynk; Barbara Romelczyk-Baishya; Anatolii Laptiev; Oleksandr Tolochyn; Zbigniew Pakiela

doi:10.4028/www.scientific.net/KEM.577-578.245

Paper Titles

Evaluation of Elastic Properties of Satin Composites
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Computational Modelling of Brittle Failure in Polycrystalline Materials Using Cohesive-Frictional Grain-Boundary Elements
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Dislocation Clusters and Microcracks in Thin Films of LCF-Tested Austenitic Steel
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Application of Laplacian Operators on Noisy Data to Compute Curvature with Proper Orthogonal Decomposition
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Fatigue Crack Growth in Fe Mini-Samples Consolidated by Means of Impact Sintering
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Application of Ductile Damage Concepts in the Evaluation of Material Formability during Screw Head Cold Forming
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Modeling of Cure-Induced Residual Stresses in 3D Woven Composites of Different Reinforcement Architectures
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Determination of Triaxial Tensile Failure Surfaces for Curing Epoxy Resins
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Fatigue Performance of Copper Alloys in Seawater Environment
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Fatigue Crack Growth in Fe Mini-Samples Consolidated by Means of Impact Sintering

Abstract:

The paper presents the results of fatigue crack growth rate test of iron sinters. The samples were produced by means of the impact sintering. Applied production method allowed to obtain dense sinters with fine grain size resulted from large shear strains. Due to the limited size of the final products the mechanical tests were carried out in mini-samples. Optical, non-contact method of displacement measurement, namely Digital Image Correlation (DIC), was applied for determination of the displacement fields near the crack tip at the maximal force of selected loading cycles. The results of DIC measurement were utilized in the calculations of stress intensity factors and crack tip coordinates by means of the iterative procedure based on inverse method. These parameters were used for measuring crack development rate. There were investigated two types of materials produced by the consolidation of two different kinds of Fe powders and sintered in different temperatures. The results of crack growth rate tests were correlated with the microstructure changes, as well as yield and ultimate strength of the materials.