Posted: 11/8/2010 8:00:08 AM EDT
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Cool. Now do an upper and lower receiver set.  That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? |
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Quoted: Quoted: Quoted: Quoted: Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Brittle thin-skin surface hardening makes for great surface cracks/stress concentrations... |
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Quoted: I have no idea what you're talking aboutQuoted: Quoted: Quoted: Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? |
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I have no idea what you're talking about
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Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? Just tell him that he didn't say anything about material or fabrication costs and that as long as the thing doesn't have to fly, 9 times out of 10 your best bet is steel. |
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Quoted: Stiffer/harder material isn't always better for durability in some designs...Quoted: I have no idea what you're talking aboutQuoted: Quoted: Quoted: Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? Also, a solid aluminum beam with twice the cross section of a steel beam may weigh about the same, but will be less prone to buckling due to the increased profile, so it becomes a balance of stiffness and weight... |
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Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? "Now I can jus' plug 'er into Nastran!" and "wah-lah"... 
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Cool. Now do an upper and lower receiver set. That'd be awfully heavy and unneccessary. Cool stuff, OP. Ti heavier than AL ? Yes, titanium alloys are 50% more dense than aluminum. There's no way I would add beta case on titanium parts, but it's okay for low performance consumer products that won't kill someone when the part fails. Here's something else for the budding structural engineers to ponder. The Young's Modulus (E) for aluminum, titanium, and steel are approximately 10 million psi, 16 million psi, and 30 million psi, respectively. Their densities (we'll use r) are 0.10 , 0.16, and 0.30 pound per cubic inch, respectively. E/r is equal for all three alloys. Which material is best for a stiffness dominated design? Which material is best for a buckling dominated design? Why? Why would one choose one over the other in a strength dominated design? Why, what causes the choice of one over another? "Now I can jus' plug 'er into Nastran!" and "wah-lah"... I thought they locked you up. NASTRAN is sooo passe' nowadays ... |