COMAC C919 - China's first modern airliner

SamuraiBlue

SamuraiBlue

Captain
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.
 
Hendrik_2000

Hendrik_2000

Lieutenant General
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
 
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a1a2a3a4a5a6a

New Member
Registered Member
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.
 
SamuraiBlue

SamuraiBlue

Captain
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
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and
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, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a
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, but to go beyond this limit you need to make the parts bulky defeating the use of Titanium to replace Aluminum.
 
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a1a2a3a4a5a6a

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Strength-to-weight ratio= (failure) strength-to-weight ratio. The about 1.4-to-1 weight disadvantage for aluminum toward titanium applies.
 
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a1a2a3a4a5a6a

New Member
Registered Member
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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