Diagram (Fig. 6) below shows the creep test of a 2.25Cr-1Mo Steel at temperature of 600°C under test stress of 95 MPa. After checking the diagram, an engineer believes the strain change linearly at times between 400 and 800 hours. When use a 3 inch long rod made of this material, how long in inch will it be before it fractured under 95 MPa stress at 600°C? 30 25 2 20 Creep strain, & (%) 15 10 5 ......... 0 200 400 600 800 1000 1200 1400 1600 1800 Time, t/h 01. 3.80 O II 3.25 O 13.00 O IV 3.08

The creep test, also known as the stress relaxation test in some cases, is a destructive materials testing technique for determining a material's long-term strength and heat resistance.

The failure creep is 27%

the value is 0.27

0.27 * 3 = 0.8

new length

lf = 0 .8

The goal of the creep test is to determine the precise rate of secondary or steady state creep. The slope of the line, or the amount of deformation in a given period, increases as the tension or temperature increases.

Thus the length of rod at failure is 3.8

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