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OceanGate CEO Bragged About Using Expired Carbon Fiber to Build Doomed Sub (futurism.com)

submitted 1 year ago by [email protected] to c/[email protected]

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New evidence strongly suggests that OceanGate's submersible, which imploded and killed all passengers on its way to the Titanic wreck, was unfit for the journey. The CEO, Stockton Rush, bought discounted carbon fiber past its shelf life from Boeing, which experts say is a terrible choice for a deep-sea vessel. This likely played a role in the submersible's tragic demise.

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[–] [email protected] 3 points 1 year ago (1 children)

I have absolutely zero knowledge on deep sea submersibles but every bit of reporting I've read or listened to over the past week has said that carbon fiber is a very poor choice for a deep sea vehicle. Given its propensity to eventually delaminate, it is much more likely to fail over repeated uses than titanium or the other materials the industry uses (I've primarily heard comparisons to titanium).

[–] [email protected] 7 points 1 year ago

Delamination is just carbon fiber composites main mode of failure. As long as the material you use is rated for its stress life it's fine. Buying expired material means the resin was decomposing, making the carbon fiber composite more prone to failure.

All materials eventually fail, some have endurance limits with infinite stress lives, like most steels. Some don't, like aluminum. Without knowing the details of their design there's not an easy way to say whether carbon fiber was even a bad choice at all. But buying expired carbon fiber absolutely is a bad idea for anything critical.

The stress life curves for carbon fibers vary a lot, they certainly won't be as nice or long lasting as most metal alternatives, but that just means more replacement or maintenance, something a luxury submarine doesn't necessarily care about as much.