强度断裂及断裂韧性
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In as much as the line segment passes through the origin, it is convenient to take both
150 MPa, then will have a value
s=0.3 J/m
④永久变形的影响
计算值显著低于实验值。其原因是裂纹前沿扩展所需的永久变形功上。
1/2
(b) True stress is defined by Equation 7.15, where in this case the area is taken as the fracture area Af . However, the load at fracture must first be computed from the fracture strength as
Thus, the true stress is calculated as
Solution:
K IC =Y. σc .（π.a）1/2
=1.0×1000×(3.14×0.75×10-3)1/2
=27.4 Mpa m1/2
(3) 影响因素