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http://dx.doi.org/10.7777/jkfs.2019.39.1.1

On Shrinkage Cavities Shape Modeling for Fatigue Simulation of A356 Alloy Specimen  

Kwak, Si-Young (Cyber Manufacturing Process Group, Korea Institute of Industrial Technology (KITECH))
Cho, In-Sung (Cyber Manufacturing Process Group, Korea Institute of Industrial Technology (KITECH))
Publication Information
Journal of Korea Foundry Society / v.39, no.1, 2019 , pp. 1-6 More about this Journal
Abstract
During the casting process, it is possible to minimize shrinkage and blowholes by modifying the casting design. However, it is impossible to eliminate these factors completely. Therefore, mechanical design engineers apply a sufficient safety factor owing to the possibility of insufficient performances of the cast products. In this paper, prediction method of the fatigue life of cast products containing shrinkage is conducted by using CT (computed tomography) and the SSM (shape simplification method), and additional fatigue analyses are carried out. The analysis results are then compared to results from actual experiments on samples with shrinkage defects. It is found to be that the considering actual shrinkage in cast products by means of stress and fatigue analyses is more accurate and effective. It is also considered that the proposed hot spot method provides us a good tool to predict the fatigue lifes of cast product.
Keywords
Shrinkage defect; Fatigue life; 356 Aluminum casting; SSM (Shape simplification method); Hot spot stress; CT (Computed Tomography);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Kwak SY, Lim CH and Beak JW, Korea Society of Mechanical Engineers. A, "Contribution analysis using shape simplification method for casting structure shrinkage", 33 (2009) 807-812.   DOI
2 Lee SW, Kim HK,. Hwang HY and Kwak SY, J. Korea Foundry Society, " Modeling for the fatigue analysis of Al alloy casting containing internal shrinkage defect", 30 (2010) 196-200.
3 Kwak SY, Cheng J, Kim JT and Choi JK, International Journal of Cast Metals Research, "Approach to impact analysis of automobile Al alloy wheel in presence of casting shrinkage defect", 24 (2011) 233-237.   DOI
4 Jo SW, Park JW and Kwak SY, J. Korea Foundry Society, "Finite element analysis method for impact fracture prediction of A356 cast aluminum alloy", 33 (2013) 63-68.   DOI
5 Hwang SC and Kwak SY, J. Korea Foundry Society, "Effect of shrinkage defect on fracture impact energy of A356 cast aluminum alloy", 34 (2014) 22-26.   DOI
6 C. Beckermann, R. I. Stephens, R. A. Hardin and K. M. Sigl, Internal Journal of Cast Metals Research, "Fatigue of 8630 cast steel in the presence of porosity", 17 (2004) 130-146.   DOI
7 Kim MG and Kim JH, Korea Society of Mechanical Engineers. A, " Influence of artificial defect on fatigue limit in austempered ductile iron", 23 (1999) 1922-1928.
8 Murakami, Metal Fatigue: Effects of Small Defects and Nonmetallic Inclusions, Elsevier, Amsterdam (2002).
9 Q. G. Wang, D. A. Apelian and D. A. Lados, J. Light. Met., "Fatigue behavior of A356-T6 aluminum cast alloys. Part I. Effect of casting defects", 1 (2001) 73-84.   DOI
10 Kim DJ and Seok CS, Korea Society of Mechanical Engineers, "Fatigue strength assessment of the cruciform fillet welded joints using hot - spot stress approach", 29 (2005) 1488-1493.   DOI
11 The Society of Materials Science, Databook On Fatigue Strength of Metallic Materials, (1996) 1703-1710.