KS L ISO 18756-2006 Fine ceramics(advanced ceramics advanced technical ceramics)-Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack.pdf

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1、 KSKSKSKS SKSKSKS KSKSKS SKSKS KSKS SKS KS 2006 10 27 http:/www.kats.go.krKS L ISO 18756 KS L ISO 18756： 2006 (2011 ) L ISO 18756 : 2006 : ( ) ( ) ( ) ( ) ( )KCC ( ) ( ) : (http:/www.standard.go.kr) ： ：2001 12 28 ：2006 10 27 ：2011 12 26 2011-0620 ： ： ( 02-509-7270) (http:/www.kats.go.kr). 10 5 , . I

2、CS 81.060.30 KS L ISO 18756： 2006(2011 ) Fine ceramics(advanced ceramics, advanced technical ceramics) Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure(SCF) method 2003 1 ISO 18756 Fine ceramics(advanced ceramics, advanced technical ceram

3、ics) Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure(SCF) method , . 1. (SCF ) . . . . , KS L 1600 . R . 10 MPa m . ( ) . 2. . . KS B 5202 KS B 5521 KS L 1591 KS L 1600 3. . 3.1 , KI . , , , 3/2 . 3.2 3.3 , KIscSCF . . 3.4 L ISO 18756 :

4、2006 2 3.5 3.6 , KIc KI 3.7 . . 3.8 . R . 3.9 4 4 , ( 2 ). 3.10 4 4 , ( 2 ). 3.11 4. a c d h A ( 2 ) B F H1(a/c, a/W) H2(a/c, a/W) KI , I KIc , I KIsc , L LT M(a/c, a/W) P Q(a/c) S(a/c, a/W) W Y Yd Ys Ymax 5. , , , . KIsc ( 1 ). 1 4 1 4 1 3 1 3 L ISO 18756 : 2006 3 . . 4 . KIsc . , . . 1, 2 , 3, 4,

5、5 . ( ) SCF . ( ) . . , , . ( ) . . . SCF 3, 4, 5, 6, 7 . 1 6. 6.1 KS B 5521 1 % , . 6.2 4 2 . KS L 1591 . . 7.1 , . . 7.1 . . . . 4 , . 20 mm 10 mm 4 , KS L 1591 . 1490Yd . 8.3.6 ： (A.7.b) . 8.3.7 , A.4 (A.7.d) . 8.3.8 2c 0.5B a 0.5W , . 8.4 8.4.1, 8.4.2 8.4.3 . 8.4.1 23 . A.4 (A.7.d) . . 8.4.2 . .

6、 , 99.9 % , 0.13 Pa . . 0.5 mm/min . 1. . 2. . 8.4.3 (8.2.2, 8.2.3 8.2.4) (8.4.2) . . . 8.4.4 KIsc . . 8.5 ：R (R ) B . 8.6 ： . 9. 9.1 Yd Ys . a/c 1, a/W 1.0, 2c/B 0.5 ( 8 ). 9 , a/c 1 L ISO 18756 : 2006 12 . B W . Yd ( MH2)/ Q (2) Q 1 1.464(a/c)1.65M 1.13 0.09(a/c) 0.54 0.890.2 (a/c) 1(a/W)2 0.5 0.6

7、5 (a/c) 1 14(1 a/c)24(a/W)4H2 1 1.22 0.12(a/c)(a/W ) 0.55 1.05(a/c)0.75 (a/c)1.5(a/W )2 Ys ( MSH1)/ Q .(3) H1 1 0.34 0.11(a/c)(a/W ) S 1.1 0.35(a/W)2 )/( ca W 3 mm(310 3m), a 5010 6m, 2c 12010 6m, a/c 0.833, a/W 0.017 , Yd 1.267, Ys 1.292 9.2 Ymax Yd Ys KIsc . KIsc Ymax3PA /BW 2 a .(4) KIsc： (MPa m,

8、 MN/m3/2) Ymax： ( ) A： 4 (mm), A (S0 Si)/2 a： (m) c： (m) P： (N) S0： ( ) (mm) Si： ( ) (mm) B： (mm) W： (mm) (MPa) . , . 9.3 , 0.15 mm C . 9.4 (8.3.7) (4) . 10. . a) b) , ( , ) L ISO 18756 : 2006 13 c) d) , , e) B W f) a 2c. Y . , . g) ( SEM) h) i) j) k) KIscl) m) . n) o) R p) L ISO 18756 : 2006 14 A()

9、 A.1 A.1.1 . 0.0500.200 mm(50200 m) , . , , , . 5 10 . . (SEM) . 100 500 . . A.1 . A.1.2 . . A.1 A.4 . . , ( 3 5). A.1.3 , , . A.1.4 . a) ( ) b) ( ) ( ) c) d) e) ( ) a) b) , . A.1.5 . . . , . . L ISO 18756 : 2006 15 . ( ). A.1 ( ) “ ” “ ” . A.2 50 m 50 m L ISO 18756 : 2006 16 . A.2 . A.3 . . . A.4 9

10、9.9 % A.1.6 , “ ” . . . . . A.1.7 . A.1.8 , (low angle) . 50 m 100 m Fast FractureHaloPrecrackL ISO 18756 : 2006 17 . A.5 . . A.1.9 (hackle lines) A.6 . A.1.10 . . (50 100 ) . , , . , (100 500 ) . A.1.11 . . . A.1.12 (1020) . . , . A.1.13 , . 1020 . , . A.1.14 (back scattering mode) . A.1.15 . 20 nm

11、 . A.1.16 ( ) . A.1.17 . A.1.18 . . . . . L ISO 18756 : 2006 18 a) b) (a) (b) (c) , . ( A.4 ). ( A.2 ). A.5 “ ” a) b) A.6 (c) (b) (a) L ISO 18756 : 2006 19 A.2 A.2.1 . . . . , . Y (8.3.4). a) A . B C . . A B . Ymax Yd (8.3.5). b) (1/2 .). . . 33 % (8.3.4). c) A.7 L ISO 18756 : 2006 20 R . . . 8.3.7 . A.4 . d) , , . . e) 3 . 3 , “ ” “ ” . , ( .). . f) A.7 ( ) L ISO 18756 : 2006 21 B() SCF R B.1 B.1 KR ( ) . R . R , , , , , . R . R R , KIsc, KIpb . SCF R R . . . R . . a) R . b) R R . ,