network profile
| bio | website | |
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| location | ||
| age | ||
| visits | member for | 11 months |
| seen | May 31 at 2:46 | |
| stats | profile views | 17 |
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May 31 |
comment |
What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle? That is NOT my point. I want to tell you that material can be broken under the ideal ultimate stress strength, maybe within elastic range. Have you seen that S-N figure at 1E+3 cycle? The breaking stress from 350MPa to 200MPa. |
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May 30 |
comment |
What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle? Please read the S-N curve of en.wikipedia.org/wiki/Fatigue_(material) . It only needs 25% or less of the ultimate stress of the aluminium to break that aluminium IF the test is using that stress for running 1E+7 cycles. |
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May 29 |
comment |
What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle? " For a metal piece tested under room conditions, the stress must exceed the elastic limit to cause any damage to the sample." I don't think this is right. |
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May 27 |
comment |
What is the minimum wrap around angles of belt, timing belt and chain? I read the following in a book, but I am not 100% understand because it combines pulley and sprocket in a paragraph. "The radial distance for which the belt is in contact with the pulley surface, or the number of teeth in engagement for positive drive belts, is called the wrap angle. Belt and sprocket combinations should be chosen to ensure a wrap angle of about 120°around the smaller pulley. The wrap angle should not be less than 90°, especially with positive drive belts, because if too few teeth are in engagement, the belt may jump a tooth or pin and timing or synchronization may be lost." |
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May 27 |
asked | What is the minimum wrap around angles of belt, timing belt and chain? |
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May 23 |
comment |
What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle? Could you please give some examples? Do you have any figures from some experiment? This is a research direction question, so I need some data to support. Thanks |
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May 22 |
asked | What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle? |
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Apr 19 |
awarded | Tumbleweed |
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Apr 17 |
awarded | Popular Question |
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Apr 12 |
asked | How to find the inflow pressure and outflow pressure of blower and vacuum? |
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Apr 10 |
awarded | Supporter |
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Apr 10 |
comment |
How does a small radius connector affect gas flow? Thanks. This is what I need. |
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Apr 10 |
awarded | Critic |
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Apr 10 |
accepted | How does a small radius connector affect gas flow? |
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Apr 10 |
awarded | Commentator |
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Apr 10 |
comment |
How does the radius and length of a pipe affect vacuum performance? I want to know whether I can use dV/dt equation (mass flow rate of Poiseuille equation in my case) |
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Apr 10 |
comment |
How does the radius and length of a pipe affect vacuum performance? Thanks for your reply. I am asking about "Poiseuille's equation" NOT "Bernoulli's_principle" en.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equation |
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Apr 10 |
comment |
How does the radius and length of a pipe affect vacuum performance? Your answer is assumed friction-less system and assume for a long flow. My case is a small volume. Please help. Thanks |
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Apr 10 |
asked | How does a small radius connector affect gas flow? |
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Apr 10 |
asked | How does the radius and length of a pipe affect vacuum performance? |
