Damage Characteristics of 2D C/SiC-ZrC Composites under Low Velocity Impact

doi:10.15541/jim20200138

Abstract

Abstract:

The effects of impact energy on damage characteristics and tensile properties of 2D C/SiC-ZrC composites were studied by low-speed impact, post-impact tensile tests and the CT scanning methods. The results indicated that C/SiC-ZrC composites had a high impact damage tolerance. The damage state of the composites in the energy range of 15-24 J was mainly shown as penetrating damage. When the impact energy increased within the range of 15-24 J, the nominal tensile strength of C/SiC-ZrC composites reduced slowly, with a maximum decrease of around 25%. The impact mainly caused lamination and fiber fracture damage near the impact areas. However, the impact damage was not observed out of the impact areas.

Key words: C/SiC-ZrC, ceramic matrix composites, impact, residual tensile strength

CLC Number:

TB332

PI Huilong, ZHANG Baopeng, YU Xinmin, LIU Wei, JIN Xin. Damage Characteristics of 2D C/SiC-ZrC Composites under Low Velocity Impact[J]. Journal of Inorganic Materials, 2020, 35(12): 1327-1332.

Figures/Tables 12

Fig. 1 Shape and size of the specimen

Fig. 2 Stress distribution of the specimen

Table 1 Experimental conditions of the low velocity impact

No.	Mass/kg	Height/cm	Impact energy/J	(Energy /Thickness) /(J·mm^-1)
1	3.5	0	0	0
2		43.7	15	2.5
3		52.5	18	3.0
4		61.2	21	3.5
5		70.0	24	4.0

Fig. 3 Cross-sectional microstructure of the C/SiC-ZrC composite

Fig. 4 Front and back macrographs of the C/SiC-ZrC composites after impact (a, b) 15 J, (c, d) 18 J, (e, f) 21 J, (g, h) 24 J

Fig. 5 Front micrographs of the composites after impact (a) 15 J; (b) 18 J; (c) 21 J; (d) 24 J

Table 2 Damage sizes and residual tensile strength of the composites after impact

Impact energy/J	Front damage area/mm²	Front damage depth/mm	Back damage area/mm²	Back damage height/mm	Residual tensile strength /MPa
0	—	—	—	—	218.0
15	50.0	0.78	120.9	1.00	178.9
18	95.3	1.66	173.7	1.90	170.7
21	103.5	2.06	258.3	2.40	167.8
24	135.5	2.66	277.3	4.92	165.6

Fig. 6 Damage areas of the composites after impact under various energies levels

Fig. 7 Depth and height of the damage areas for the composites after impact with different energies

Fig. 8 Tensile strength of the composites after impact with different energies

Fig. 9 Surface (a) and cross-section (b) morphologies of the composite after impact (with energy of 24 J) and tensile tests

Fig. 10 CT scanning results of (a) XY and (b) XZ planes of the composite afte impact (with energy of 24 J) and tensile tests

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