Astructural component in the form of a wide plate is to be fabricated from a steel alloy that has a plane strain fracture toughness of 98.9 mpa root m (90 ksi root in.) and a yield strength of 860 mpa (125,000 psi). the flaw size resolution limit of the flaw detection apparatus is 3.0 mm (0.12 if the design stress is one-half of the yield strength and the value of y is 1.0, determine whether or not a critical flaw for this plate is subject to detection.

a > 3 mm

so that critical flow is subject to detection  

Explanation:

plane strain fracture toughness = 98.9 MPa root m

yield strength = 860 MPa

flaw detection apparatus = 3.0 mm

Y = 1

solution

we know  critical stress formula that is

critical stress    .............................1

here K is design stress plane strain fracture toughness and a is length of surface creak

so here length of surface creak will be

length of surface creak a =  

put here value

a =  

a = 0.0168 m = 16.8 mm = 0.66 in

so

a > 3 mm

so that critical flow is subject to detection  

not  

cuba  

russia  

iraq  

el salvador  

explanation:

known as the land of volcanoes, el salvador has visit seismic tremors and volcanic movement. it is the main nation in central america that does not have a coastline on the caribbean sea. about portion of all salvadorans live in the wide open. they are poor and don't have power or running water in their homes. in 1525, pedro de alvarado, a lieutenant of cortés's, vanquished el salvador. el salvador, with alternate nations of central america, pronounced its freedom from spain on sept. 15, 1821, and was a piece of a league of central american states until the point when that association broke up in 1838.