Prediction method for fracture behavior of casting materials under uniaxial tension considering effect of pores

Zhongyuan QIU, Yutong YANG, Jiang ZHENG, Xiaowang SUN, Xianhui WANG, Shiyao HUANG

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (6) : 154-161. DOI: 10.11868/j.issn.1001-4381.2023.000670
RESEARCH ARTICLE

Prediction method for fracture behavior of casting materials under uniaxial tension considering effect of pores

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Abstract

Defects are the main factors affecting fracture behavior of casting materials. The fracture behavior of high pressure casting aluminium alloy is predicted using Gurson-Tvergaard-Needleman （GTN） damage model combined with finite element simulation software. The results show that damage parameters suitable for high pressure casting aluminum alloy materials are obtained through finite element reverse fitting， with a nucleated void volume fraction f N = 0.12， critical void volume fraction f c = 0.001， and fracture void volume fraction f F = 0.001. At the same time， fracture behavior prediction based on microscopic features is carried out by simplifying the pore morphology as ellipsoids and ignoring pores with volumes less than 0.001 mm3， to avoid low efficiency and non convergence in finite simulation calculations. The applicability of the two models in predicting the fracture behavior of casting materials is compared， and it is concluded that the finite element simulation combined with damage mechanics has higher computational efficiency， but the finite element simulation based on microscopic characteristics has higher prediction accuracy.

Key words

casting defect / high pressure casting aluminium alloy / fracture behavior / GTN damage model / simplification of pore

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Zhongyuan QIU , Yutong YANG , Jiang ZHENG , et al . Prediction method for fracture behavior of casting materials under uniaxial tension considering effect of pores. Journal of Materials Engineering. 2025, 53(6): 154-161 https://doi.org/10.11868/j.issn.1001-4381.2023.000670

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