Defect-correlated fatigue assessment of A356-T6 aluminum cast alloy using computed tomography based Kitagawa-Takahashi diagrams

被引：48

作者：

Tenkamp, Jochen ^{[1
]}

Koch, Alexander ^{[1
]}

Knorre, Stephan ^{[2
]}

Krupp, Ulrich ^{[2
]}

Michels, Wilhelm ^{[2
]}

Walther, Frank ^{[1
]}

机构：

[1] TU Dortmund Univ, Dept Mat Test Engn WPT, Baroper Str 303, D-44227 Dortmund, Germany

[2] Univ Appl Sci Osnabruck, Inst Mat Design & Struct Integr, Albrechtstr 30, D-49009 Osnabruck, Germany

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2018年 / 108卷

关键词：

Aluminum cast alloy; Computed tomography (CT); High cycle fatigue (HCF); Fatigue crack propagation; Kitagawa-Takahashi diagram; CRACK INITIATION; BEHAVIOR; GROWTH; MICROSTRUCTURES; MECHANISMS; LIFE;

D O I：

10.1016/j.ijfatigue.2017.11.003

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Modern aluminum cast alloys are promising candidates for highly loaded lightweight components due to their good strength-to-weight ratio. To enable a safe design of aluminum cast components, the microstructure characteristics, e.g. porosity, secondary dendrite arm spacing and Si eutectic morphology, have to be taken into account. This study deals with the influence of different porosity characteristics on the fatigue behavior of A356-T6 aluminum cast alloy. For this purpose, cyclic deformation tests have been carried out to study fatigue damage and fatigue crack growth in the high cycle fatigue (HCF) regime up to 10(7) cycles. The porosity of each batch was quantified using micro-computed tomography. Results show that large porosity dominates the HCF fatigue behavior. The relationship between porosity characteristics and the fatigue limit as well as S-N curve was assessed by Kitagawa-Takahashi diagrams and a fracture mechanic approach.

引用

页码：25 / 34

页数：10

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