Data for stress corrosion cracking of 2 alloys are given below: For alloy A, Kgc

Question

Data for stress corrosion cracking of 2 alloys are given below: For alloy A, Kgcc = 9.8 MPa.rm1/2 and K,e* 11 MPa.m1/2. For alloy B, Kisce* 10.4 MPam1/2 and Kic 21 MPa.m1/2. Based on these data . Alloy A exhibits variable amplitude failure while alloy B exhibits constant amplitude failure O Alloy A fails by plane stress mode while alloy B fails by plane strain mode O Alloy B will take a longer time to crack than Alloy A O Alloy A exhibits blister cracks while alloy B is susceptible to failure by multiple slip bands O Alloys A and B are likely to exhibit grain boundary slip O Alloy A can exhibit dislocation glide while alloy B can fail by grain boundary Nabarro sliding O Alloy A can exhibit void coalescence while alloy B can exhibit microscopic striations

Explanation / Answer

stress corrosion cracking is the growth

of crack formation in a corrosive environment.

it can lead to unepecteed sudden failure

of normally ductile material subjected to tensile stres,

especially at elevated temperature.

here from the given data,

these datas represent the tendency at beahviour towards corrosion cracking.

a crack initiates at Kiscc and thereafter propagates at slow rate and as growth advances

the value of k rises. finally it reaches Kic hereupon fast fracture ensures the component failure.

for alloy A, the difference in the values are not so significant

an the low value of shows the quick failure for A as Kic is reached quickly.

but for alloy B Kic is large but Kiscc is similar to alloy A

so B takes relatively larger time than alloy A

so answer is B takes longer time than A.......option C

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