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(CHE 253) EXAM 3
C'mon bruh
Question | Answer |
---|---|
Major cause of Crack | defects |
Does crack propagate faster or slower along grain boundaries | faster |
for ductile materials crack is stable due to hinderance of crack propagation, what is the cause of the hinderance? | |
for brittle materials, crack propagation is very fast, why? | |
Max Stress at crack tip formula is... | σm=2σo(a/p)^1/2 |
cyclic stress till failure is called | fatigue |
critical stress formula | σc={[2E(ys+yp)]/[pi/a]}^1/2 |
fatigue | cyclic stress overtime until failure |
4 information of applied cyclic stress | mean stress, range of stress, stress amplitude, stress ratio |
stress amplitude over time (s-t curve) | look like a sine wave |