B. Fracture toughness 8. Ur E. Critical free energy A. B. 2. Which measure may s
ID: 637812 • Letter: B
Question
B. Fracture toughness 8. Ur E. Critical free energy A. B. 2. Which measure may stop crack growth? A. Create a crack parallel to the existing one. B. Fill the crack with a synthetic rubber. C. Insert a wedge to open the crack. D. Drill a hole at the crack tip. E. Sharpen the crack tip. 3. What is described by the following equation? A. Stress distribution ahead of a crack tip B. Stress concentration at a crack tip C. Tensile strength of a brittle solid D. Tensile strength of a ductile solid E. Ultimate tensile strength B. C. D. E. 10. ?? me A. B. 4. What is Pt in Equation (2)? A. True material density B. Radius of the crack tip C. Density at the crack tip D. Distance from the crack tip E. Radius of the transgranular zone E. 11. WI 5. What is described by the following equation?Explanation / Answer
Ans 2 : D) drill a hole at the crack tip
Drilling a hole at the tip of crack is the easiest and fastest way to stop the growth of a crack. The radius of the local tip is altered and the SIP is reduced.
The stress on the crack is reduced due to which it does not propagates further.
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