Page 376 - Mechanical Behavior of Materials

Section 8.6 Fracture Toughness Values and Trends 377

160 b for compact 1000
5.1 cm 800
10.2
K , Fracture Toughness, MPa m 120 b, t, 2h = 2.5 cm 50.8 600 σ , Yield Strength, MPa
20.3
30.5
σ
o
61.0

80

Ic

40 400 o
K 200
Ic
ASTM A533B-1 steel
0 0
-150 -100 -50 0
o
Temperature, C
Figure 8.33 Fracture toughness and yield strength versus temperature for a nuclear pressure
vessel steel. Compact specimens and one nonstandard geometry were used in sizes indicated.
(Adapted from [Clark 70]; copyright c ASTM; reprinted with permission.)

30 Si N
K , Fracture Toughness, MPa m 20

3 4

10

c
0
20 1100 1150 1200 1250
o
Temperature , C
Figure 8.34 Fracture toughness vs. temperature for a silicon nitride ceramic. (Adapted from
[Munz 81]; copyright c ASTM; reprinted with permission.)