Stress Intensity Factors For Fracture Toughness Tests
| Compact tension specimen
The stress intensity factor at the crack tip of a compact tension specimen is where is the applied load, is the thickness of the specimen, is the crack length, and is the width of the specimen. |
|
| Single edge notch bending specimen
The stress intensity factor at the crack tip of a single edge notch bending specimen is where is the applied load, is the thickness of the specimen, is the crack length, and is the width of the specimen. |
![\begin{align} K_{\rm I} & = \frac{P}{B}\sqrt{\frac{\pi}{W}}\left[16.7\left(\frac{a}{W}\right)^{1/2} - 104.7\left(\frac{a}{W}\right)^{3/2} + 369.9\left(\frac{a}{W}\right)^{5/2} \right.\\ & \qquad \left.- 573.8\left(\frac{a}{W}\right)^{7/2} + 360.5\left(\frac{a}{W}\right)^{9/2} \right] \end{align}](http://upload.wikimedia.org/math/b/d/e/bde1eb5327c6f97b5543669cecf5006f.png)
![\begin{align} K_{\rm I} & = \frac{4P}{B}\sqrt{\frac{\pi}{W}}\left[1.6\left(\frac{a}{W}\right)^{1/2} - 2.6\left(\frac{a}{W}\right)^{3/2} + 12.3\left(\frac{a}{W}\right)^{5/2} \right.\\ & \qquad \left.- 21.2\left(\frac{a}{W}\right)^{7/2} + 21.8\left(\frac{a}{W}\right)^{9/2} \right] \end{align}](http://upload.wikimedia.org/math/4/d/3/4d38a368af1d0bfb9e92dd0e599a7591.png)
Read more about this topic: Stress Intensity Factor
Famous quotes containing the words stress, intensity, factors, toughness and/or tests:
“While ... we cannot and must not hide our concern for grave world dangers, and while, at the same time, we cannot build walls around ourselves and hide our heads in the sand, we must go forward with all our strength to stress and to strive for international peace. In this effort America must and will protect herself.”
—Franklin D. Roosevelt (1882–1945)
“Many women are surprised by the intensity of their maternal pull and the conflict it brings to their competing roles. This is the precise point at which many women feel the stress of the work/family dilemma most keenly. They realize that they may have a price to pay for wanting to be both professionals and mothers. They feel guilty for not being at work, and angry for being manipulated into feeling this guilt. . . . They don’t quite fit at home. They don’t quite fit at work.”
—Deborah J. Swiss (20th century)
“I always knew I wanted to be somebody. I think that’s where it begins. People decide, “I want to be somebody. I want to make a contribution. I want to leave my mark here.” Then different factors contribute to how you will do that.”
—Faith Ringgold (b. 1934)
“Indeed, there are no easy correlations between parental ideology, class or race and “successful” child development. Many children the world over have revealed a kind of toughness and plasticity that make the determined efforts of some parents to spare their children the slightest pain seem ironic.”
—Robert Coles (20th century)
“Letters have to pass two tests before they can be classed as good: they must express the personality both of the writer and of the recipient.”
—E.M. (Edward Morgan)