Dynamic response of ceramic shell for titanium investment casting under high strain-rate SHPB compression load
作者： Yameng Wei , Zhigang Lu , Kehui Hu , Xinyi Li , Peijie Li
DOI: 10.1016/J.CERAMINT.2018.03.247
关键词: Fracture (geology) 、 Compressive strength 、 Materials science 、 Stress (mechanics) 、 Investment casting 、 Split-Hopkinson pressure bar 、 Fracture mechanics 、 Shell (structure) 、 Composite material 、 Ceramic 、 Process Chemistry and Technology 、 Materials Chemistry 、 Electronic, Optical and Magnetic Materials 、 Surfaces, Coatings and Films 、 Ceramics and Composites
摘要: Abstract The mechanical performances of ceramic mold are crucial for the quality casts in investment casting. However, most previous researches were focused on quasi-static performance which is not sufficient accurate failure analysis shell under complex stress state. In this investigation, dynamic behaviors Al2O3-SiO2 casting have been studied using split Hopkinson pressure bar (SHPB) at high strain rates. Sand pack samples and pure slurry considered testing order to further understand mechanism fracture. Weibull approach was then applied describe strength distribution shells. increase factor (DIF) compressive increased from 1.23 (863 s−1) 2.03 (1959 s−1) indicating dependency property strain-rate. cross-section fracture surface analyzed through scanning electron microscopy (SEM). microstructural investigations showed that crack propagation mainly weak interface between sand particles region load. At strain-rate, path different extends well sintered even runs particles. based Griffith criterion. addition, feature stress-strain curves indicates layered structure plays an important role process
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