A) What are the two conditions for causing a part to break by crack propagation? Are the following elements favorable or unfavorable to crack propagation in a metal alloy? Justify your answer. 1. Presence of heterogeneities; 2.Increase in the volume of the piece; 3. Good finish 4. Presence of porosity; 5. Increased ductility; 6. Increased work hardening; 7. Decrease in grain size.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A) What are the two conditions for causing a part to break by crack propagation?
Are the following elements favorable or unfavorable to crack propagation in a metal alloy? Justify your answer.
1. Presence of heterogeneities;
2.Increase in the volume of the piece;
3. Good finish
4. Presence of porosity;
5. Increased ductility;
6. Increased work hardening;
7. Decrease in grain size.

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