第五章陶瓷基复合材料的性能.doc

第五章陶瓷基复合材料的性能.doc第五章陶^^^材料的性能
第五章陶瓷基复合材料的性能


弯曲试验
⑻ (b)
(c)
图 5一2 Variation in stress with specimen length: (a) three-point bend test; maximum stress occurs along a plane in the center of the span length; (b) four-point bend test; a constant stress acts over the inner span length; (c) tensile test; the whole gage length of the specimen is subjected to a uniform stress.
5・1陶瓷材料力学性能测试
•应变曲线
Fiber
Single fracture
Matrix
Strai n —>
— —CDIDI常匕 一
azu = a^t + Un("\ - Vi)
Sj(1 —vj
Vf
图 5-3 Stress-strain curves and strength of composite vs. fiber volume fraction showing conditions for single and multiple cracking, in a unidirectionally aligned fiber composite: (a) matrix strain to failure greater than that of the fiber, and (b) matrix strain to failure less than that of the fiber.
5・1陶瓷材料力学性能测试
•应变曲线
Strain ―>
(b)
W* > Ge
Single ； Multiple matrix
0 Vcrit 1
Vf—
Ill
Ill

Fiber bundle failure
Strain •
图54拉伸时陶瓷基复合材料的应力•应变曲线
III
III
III
III
陶瓷基复合材料
====
Rule of Mixtures
• Measured
O Calculated, Corrected for Matrix Porosity
00 •1
0 10 20 30 40 50 60 70 80 90 100
Vf,%
图 5-5 Linear increase in Young s modulus with in a unidirectional, continuous carbon fiber/glass composite (after [28]).
III
III

碳毬维的樓量 Ef=210GPa
521拉伸强度与弹性模量
碳化硅纤维增强锂铝硅玻璃陶瓷复合材料的拉伸性能。
表5—ISiC纤维强
LAS复朋杨1
名称
vf
(%)
复夯式
杨模量
GPa
实號
预覆
LAS
0
■
86
LAS-1
46
单向
133
143
LAS-2
46
单向
130
143
LAS-2
44
单向
136
141
LAS-1
~50
交叉
118
LAS-3
-40
三编织
7 头 111

碳毬维的樓量 Ef=210GPa

碳化硅纤维增强锂铝硅玻璃陶瓷复合材料的拉伸性能。
5-6纤维增强LAS玻
璃陶瓷室温拉伸应力-应
变曲线


5.