The diffusion coefficient for the diffusion of hydrogen through BCC iron and FCC aluminium at room temperature is to be calculated. The better suited material for a high pressure hydrogen storage tank should be determined. Concept introduction: The diffusion coefficient using the Arrhenius type equation relation to find the maximum allowable temperature for produce flux is calculated using equation: D = D 0 exp ( − Q R T ) ......... ( 1 ) Here, diffusion coefficient is D , constant is D 0 , activation energy is Q , gas constant is R , and absolute temperature is T .

Question

1. A W10x60 with sections properties shown is to be used as a column. If the unsupported length is 5.0m, find the Safe Axial Load that can be carried by the section. Use Fy=248 MPa and K=1.50 (35pts) Section Properties: A = 11355 mm2 Ix = 142x106 mm4 rx = 111.51 mm Iy = 48 x 106 mm4 ry = 65.28 mm 2. A Steel Column will be required to carry a total load of 500KN. If a tubular section will be utilized and the required dimension must not exceed 400x400, what will be the required thickness of the section (tf=tw). Use Fy=248 MPa L=4.5m, K=1.0 and 80% of initial fa will be used. (50pts) Note: Plate thickness available are: 2mm, 3mm, 4mm, 6mm, 8mm and 10mm 3. A steel tension rod will be subjected to a tension load of 320 KN. What will be the required diameter of the rod if Fy=248 MPa (15pts)

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Question

Chapter 5, Problem 5.29P

Interpretation Introduction

Interpretation:

The diffusion coefficient for the diffusion of hydrogen through BCC iron and FCC aluminium at room temperature is to be calculated. The better suited material for a high pressure hydrogen storage tank should be determined.

Concept introduction:

The diffusion coefficient using the Arrhenius type equation relation to find the maximum allowable temperature for produce flux is calculated using equation:

D=D0exp(−QRT).........(1)

Here, diffusion coefficient is D, constant is D0, activation energy is Q, gas constant is R, and absolute temperature is T.

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1. A W10x60 with sections properties shown is to be used as a column. If the unsupported length is 5.0m, find the Safe Axial Load that can be carried by the section. Use Fy=248 MPa and K=1.50 (35pts) Section Properties: A = 11355 mm2 Ix = 142x106 mm4 rx = 111.51 mm Iy = 48 x 106 mm4 ry = 65.28 mm 2. A Steel Column will be required to carry a total load of 500KN. If a tubular section will be utilized and the required dimension must not exceed 400x400, what will be the required thickness of the section (tf=tw). Use Fy=248 MPa L=4.5m, K=1.0 and 80% of initial fa will be used. (50pts) Note: Plate thickness available are: 2mm, 3mm, 4mm, 6mm, 8mm and 10mm 3. A steel tension rod will be subjected to a tension load of 320 KN. What will be the required diameter of the rod if Fy=248 MPa (15pts)

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