Alloys equivalent weight values

Corrosion rates in normal industrial atmospheres measured as loss of weight over a period are extremely uniform among the various alloys. Table 4.19, last column, gives the corrosion rates (in g m d" ) for a number of alloys determined at Clifton Junction in recent years. The highest value recorded (0-4 g m d ) is equivalent to a rate of penetration of 0-076 mm/y, which is appreciably less than that of mild steel. 

From Farag 2008 (53), the mass of an aluminum panel that can bear the load in a civilian aircraft is 20.25 kg. The masses of CFRP and CNTRP panels of equivalent stiffness can be estimated from the proportionality of the weight to (p/ E1/3) and the values in Tables 15.5 and 15.6. The values for the aluminum alloy and Epoxy 33% carbon fabric+30% carbon fibers are based on (53). The calculated values are given in Table 15.7. The calculations show that, with the exception of Epoxy+1 wt% CVDMWNT and Epoxy+0.1 wt % MWNT (54), the aluminum panel is heaviest. The cost of material in a panel is calculated from its mass and the cost of material per kg, from Table 15.5. The results show that, with the exception of Epoxy+0.1 wt% MWNT, the aluminum panel is the least expensive. 

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