کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5015449 1464042 2017 31 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic compressive fracture of C/SiC composites at different temperatures: Microstructure and mechanism
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Dynamic compressive fracture of C/SiC composites at different temperatures: Microstructure and mechanism
چکیده انگلیسی
Fracture behavior of C/SiC composites under compressive loading is investigated both experimentally and numerically. Dynamic experiments are carried out using a modified split Hopkinson pressure bar (SHPB), along with high-speed photography. A microstructure based approach is employed to model the C/SiC composites, including SiC matrix, voids, warp and weft fiber bundles. Dynamic microstructure response and microdamage evolution are captured accurately by numerical simulations. The fracture plane of the C/SiC composites under quasi-static loading is rough, with fiber bundle splitting and fiber pullout. However, the fracture plane becomes much smoother under dynamic loading, with a negligible fiber bundle splitting or fiber pullout. Two dynamic fracture modes are observed in the high-speed images, and proved to be induced by the inhomogeneous microstructure according to the numerical simulation results. One of the fracture modes improves the toughness of the C/SiC composites significantly (an increase of 35%), mostly without strength decrease. Moreover, the low-temperature heat treatment significantly influences the mechanical properties (e.g. elastic modulus, strength, and fracture strain) of the C/SiC composites, owing to the increase in the number of microcracks and the decrease in the strength of fiber-matrix interfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Impact Engineering - Volume 109, November 2017, Pages 391-399
نویسندگان
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