COMAC C919 - China's first modern airliner

I understand what you are proposing but the article doesn't go into depth in how much less in mass Titanium is able to conserve.
Less amount of material also means larger stress to any certain portion in terms of metal fatigue leading to structural failure so you can't make it too slim if you want endurance leading to more weight.

SamuraiBlue said:

I understand what you are proposing but the article doesn't go into depth in how much less in mass Titanium is able to conserve.
Less amount of material also means larger stress to any certain portion in terms of metal fatigue leading to structural failure so you can't make it too slim if you want endurance leading to more weight.

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That is not necessarily true. Fatigue depend on the strength The higher the material strength the more it will withstand cyclic load
The new invention is not the same of your run of the mill Titanium as the article said. It supposed to be higher strength thinner and easier to fabricate

The strength-to-weight ratio, depending on the alloy, of aluminum is about 0.7 times that of titanium. So for the same strength, an aluminum component would be about 1.4 times heavier than a titanium counterpart.

All material are susceptible to

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, smaller the amount the larger the stress per unit amount when used at same point leading to material fatigue. It is known that For some materials, notably and , there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a , but to go beyond this limit you need to make the parts bulky defeating the use of Titanium to replace Aluminum.

Strength-to-weight ratio= (failure) strength-to-weight ratio. The about 1.4-to-1 weight disadvantage for aluminum toward titanium applies.

SamuraiBlue said:

How could Titanium with an atomic mass of 47 be less in weight then Aluminum with an atomic mass of only 29?
Basically with the same size, Titanium is 1.6 times heavier then Aluminum.

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Physics 101, mass ≠ weight. Certainly not on a subatomic level.

kwaigonegin said:

Physics 101, mass ≠ weight. Certainly not on a subatomic level.

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Under same gravitational condition it does.

Th correct term to use is density, because the spacing of aluminum and titanium atoms aren't the same for each material. It is only coincidental that the density of aluminum is also 0.6 times that of titanium.

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Interesting related article
Chinese scientist solves global titanium problem