Question

I know this is an engineering problem but if anyone can help me with any of these would be greatly appreciated

Answer 1

Multiple choice:
1. The KIC values of metals are i) greater than the KIC values of ceramics, ii) less than the KIC values of ceramics, iii) same as the KIC values of ceramics

2. Compared to a small crack, a large crack will cause a metal to weaken (i) more, (ii) less, (iii) the same amount

3. Mode I fracture denotes (i) fracture in pure tension, (ii) fracture in pure shear, (iii) fracture in pure tear, (iv) none of the above

4. In the field of failure analysis, the term ‘NDT’ refers to (i) New Developments in Thermal processing, (ii) Non-Destructive Testing techniques, (iii) Notch Design Technology, (iv) none of the above

5. Through careful control of processing i) it is possible to produce materials that are completely defect free, ii) it is impossible to produce materials that are completely defect free

6. Ductile fracture shows (i) a ‘cup-and-cone’ fracture surface, (ii) a flat fracture surface with no plastic deformation, (iii) neither

7. Compared to a short wire, a long wire shall break under a ______load (i) larger, (ii) smaller, (iii) same

8. A plastic composite reinforced with glass fibers is _____ than the same plastic without fibers (i) stronger, (ii) weaker

9. Brittle fracture is more dangerous than ductile fracture because i) there is no warning sign, ii) crack propagates rapidly without plastic deformation, iii) both (i) and (ii)

10. Griffith theory is used to i) predict the effect of crack size on the fracture behavior of materials, ii) determine the tensile strength, iii) calculate the fatigue life

11. Brittle materials (i) break or crumble rather than deform under a load, (ii) neck down before failure, (iii) are preferred in use over ductile materials.

12. Mode I failure means failure under (i) tension, (ii) shear, (iii) tear, (iv) none of the above.

13. A material that absorbs a large amount of energy when it fractures will have _______ fracture toughness. (i) high, (ii) low.

14. In impact test (Charpy test), if after hitting and breaking a test piece, the pendulum rises to a large height then the test piece shall likely have ______toughness. (i) low, (ii) high.

15. A crack propagating through a solid will _______ total free surface of the solid. (i) increase, (ii) decrease, (iii) not change

Answer 2

ya sorry once i posted it i realized that

Answer 3

@baldymcgee6

Answer 4

i dont know what that means

Answer 5

ya it is

Answer 6

ok i was confused about the propagate part

Answer 7

ya havent taken physics yet, and dont have much in books

Answer 8

ya i found all the answers, but there are 2 sets of them, and are completely different

Answer 9

still need number 2,6,11

Answer 10

2- more
6- cup and cone
11- I didn't answer it

Answer 11

Can you give me the answer of:
3,5,10,12

Answer 12

So u r with rajiv

Answer 13

lol yes how did you know?

Answer 14

looooool man I am with u in the same class o_0

Answer 15

not sure about any of these, but i got
3-1
5-2
10-2
12-3

Answer 16

really wow thats funny. Id like to check my answers, i found them online, and am not sure if they are right

Answer 17

1 2

2 1

3 1

4 1

5 2

6 1

7 3

8 2

9 1

10 2

11 1

12 3

13 2

14 1

15 1

this is what i got

Answer 18

I will give what am I sure about:
1-2 2-1 4-2 6-1 7-2 8-1 9-1 13-2 14-1 15-1

Answer 19

11 min left

Answer 20

I hate this class

Answer 21

lol cutting it close

Answer 22

and yes the labs wernt bad but lectures suck

Answer 23

oh yah the lab is super easy and fun

Answer 24

ya

Answer 25

ok well i give up, and turn it in

Answer 26

what section are you in?

Answer 27

006

Answer 28

oh ok im in 004