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From their investigation, http://www.spacex.com/news/2015/07/20/crs-7-investigation-up...:

The strut that we believe failed was designed and material certified to handle 10,000 lbs of force, but failed at 2,000 lbs, a five-fold difference.

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I could read that as either evidence that the CAD computations were wrong, or evidence that something completely different happened. For example, someone might have taken a shortcut in manufacturing.

Most of the struts performed to spec, with a fraction of a percent failing under much less force than they should have. That sounds like a manufacturing problem, not a design problem.

What I heard from a friend of a friend is that QA was not handled as well as it could've been.

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