Question

QA.

1. Define the "engineer's creed" as given by NSPE

2. Give the most general definition of of the statics factor of safety n

3. Define "toughness" of a given material

4. What is the qualitative indicator of toughness of a given material

5. Define stress concentration factor

6. Give 3 examples of loading wherebya 3-d state of stress occur

7. Derive the straight beam bending equation =MC/I

8. Derive the transverse shear equation =VQ/IT

9. Define the following term regrading the Iron Carbon Phase diagram:

9a. phase diagram (why do we need?)

9b. Eutectic point

9c. peritectic point

9d. Austenite

9e. Cementite

9f. Ferrite

9g. alpa iron

9h. delta iron

9i. gama iron

9j. pearlite

9k. martensite

9l. annealing

9m. quenching

9n. tempering

10. Explain how transversely loaded beam can fall due to becoming unstable

11. Give an example of a problem that you would need FEA methods to solve for stress distribution (and maximum stress)

12. Difine the following term:

12a. AISI 1040 Q&T 1200 degrees F

12b. W - 24 x 162

12c. C8 x 11.5

12d. S 24 x 120

12f. L 3 x 3 x 1/4

Answer 1

1. Engineers creed is a code of ethics followed by engineers. It was adopted National Society of Professional Engineers in June 1954. It goes as follows:

"As a Professional Engineer, I dedicate my professional knowledge and skill to the advancement and betterment of human welfare. I pledge: To give the utmost of performance; To participate in none but honest enterprise; To live and work according to the laws of man and the highest standards of professional conduct; To place service before profit, the honor and standing of the profession before personal advantage, and the public welfare above all other considerations. In humility and with need for Divine Guidance, I make this pledge.”

2. Factor of safety: It can be defined as the load carrying capacity of a system beyond the expected or actual loads.

3. Toughness can be defined as the ability of a material to absorb energy and plastically deform without fracturing. It is equal to the area under the stress strain curve.

4. Toughnnes is the area under the stress strain curve of a material.  Some tests are used to indicate the qualitative aspect of toughness.Some qualitative tests use methods such as the Charpy impact test, the Izod impact test, and the drop-weight test. Some other less common tests are the explosive bulge test, the Robertson test, the Esso test, and the tear test.