Pre-crack and Fracture Toughness Evaluation of Ceramic Thin Plates

doi:10.15541/jim20200621

Abstract

Abstract:

Controllable length of pre-crack and in-situ observation are two major difficulties in the research of fracture resistance of ceramic materials. In this study, a method of strain-induced cracking was proposed, in which the plate was bonded to a brass beam to form a composite. The bending deformation of brass beam derived the tension deformation in the tension zone of ceramic thin plate to induce the controllable crack. Four-point bending test was conducted under a tool microscope to perform in-situ observation of crack propagation. The initial crack length was controlled by adjusting the width of the tensile zone of the ceramic plate. After the crack initiation, loading continued to make the crack length meet the requirements of fracture toughness test for ceramics. Compared with standard test of fracture toughness of block materials, the above method is simple and reliable. The strain-induced method to pre-crack has high success rate, the position of crack initiation and the length of pre-crack are controllable and easy to operate. It can be widely applied to fracture toughness evaluation and crack propagation resistance analysis of ultra-thin glass and other ultra-thin brittle materials.

Key words: ceramic thin plates, pre-crack, in situ observation, fracture toughness

CLC Number:

TQ174

MA Delong, BAO Yiwang, WAN Detian, QIU Yan, ZHENG Dezhi, FU Shuai. Pre-crack and Fracture Toughness Evaluation of Ceramic Thin Plates[J]. Journal of Inorganic Materials, 2021, 36(7): 733-737.

Figures/Tables 12

Fig. 1 Schematic diagram of pre-cracking in strain control method

Fig. 2 Schematic diagram of test piece composition

Fig. 3 Width of tensile zone decreases with increase of brass beam width

Fig. 4 Schematic diagram of pre-cracking by four-point bending test in horizontal direction

Table 1 Basic mechanical properties of three types of ceramic thin plates

Material	Elastic modulus/GPa	Bending strength/MPa	Vickers hardness/GPa
Al₂O₃	(305±10)	(315±20)	(19.8±0.1)
SiC	(360±12)	(340±28)	(20.1±0.3)
Si₃N₄	(280±8)	(425±33)	(15.9±0.6)

Fig. 5 Microscopic images of composite bonded by ceramic thin plate and brass beam (a) Machining incision in the edge of ceramic thin plate specimen; (b) Composite bonded by ceramic thin plate and brass beam bonded to form a composite

Fig. 6 Diagram of pre-cracking by four-point bending test under tool microscope

Fig. 7 Schematic diagram of three-point bending test of fracture toughness

Fig. 8 In- situ observation of crack initiation and extension in Al2O3 plate (a) Initial crack; (b) Continue loading until the crack meet the requirements of fracture toughness test; (c) Crack tip

Fig. 9 Pre-crack by three-point bending test (a) Pre-crack; (b) Crack tip

Fig. 10 Pre-crack initial length by using brass beam of different widths

Table 2 Fracture toughness of ceramic thin plate and ceramic block

Material type	Thickness of the specimen/mm	Number of specimen	Number of successful pre-cracks	Fracture toughness/ (MPa∙m^1/2)
Al₂O₃	0.6	15	15	(4.17±0.26)
Al₂O₃	3	10	8	(4.21±0.25)
SiC	0.6	15	14	(3.81±0.24)
SiC	3	10	7	(3.72±0.22)
Si₃N₄	0.6	15	14	(5.28±0.31)
Si₃N₄	3	10	8	(5.36±0.33)

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