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Were liquid boosters on Shuttle ever realistic?
JF Mezei wrote:
On 2017-10-26 16:27, Fred J. McCall wrote: And they have to be "certified" for a magnitude (or multiple magnitudes in the case of something like BFR) more fill and drain cycles if they're supposed to be reusable. When dealing with composites, while you certify based on your tests, must it not be engineered to be refillable an infinite number of times? Nothing is "refillable an infinite number of times". Your question isn't comprehensible, so it can't be answered. Yes, you engineer to a maximum pressure (validate with destructive test). But when you certify a tank for X refills, isn't it more akin to stating that after X refills, you saw no defects develop? (as opposed to stating that defects appear after each fill, but tank will hold until it has Y defects). It's a combination of both of those and you don't just build something random and then determine things by test. You design to performance targets. Carbon fibre structures quickly lose their strength/integrity as soon as there is a defect. That depends on the defect. Nothing goes from pristine to instantaneous failure. A carbon fibre bike won't last long if a crack develops. Likely won't get you home because with each bump on road, the crack will get much worse. Fortunately I don't think any carbon bikes are used in SpaceX boosters. -- "The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." --George Bernard Shaw |
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