Material Crack
In the shown figure, a brittle specimen is loaded with an applied stress of 350 psi (in tension). What is the resulting stress intensity for the crack?
Expand Hint
Fracture toughness:
$$$K_{IC}=Y\cdot \sigma \cdot \sqrt{\pi (a)}$$$
where
$$Y$$
is the geometrical factor,
$$\sigma$$
is the applied engineering stress, and
$$a$$
is the crack length.
Hint 2
Fracture toughness is the stress intensity of when a brittle material will fail due to the combination of an applied stress and crack length.
$$$K_{IC}=Y\cdot \sigma \cdot \sqrt{\pi (a)}$$$
where
$$K_{IC}$$
is fracture toughness,
$$Y$$
is the geometrical factor,
$$\sigma$$
is the applied engineering stress, and
$$a$$
is the crack length.
Based on the problem statement:
- $$\sigma=350\:psi$$
- $$Y=1.1$$ (since an exterior crack was produced)
- $$a=3"$$
Therefore,
$$$K_{IC}=1.1\cdot 350psi \cdot \sqrt{\pi (3in)}=1182\:psi\cdot in^{1/2}$$$
$$$1182\:psi\cdot in^{1/2}$$$
Time Analysis
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