Technical Articles and Engineering Guidance

Engineering guidance for the contemporary engineer. Technical articles that can be leveraged by the practicing engineer at work to facilitate or enhance design and analysis endeavors.

Blog: Tutorials and Guidelines

Did you check for Pull-through?

Not surprisingly over my career…I’ve seen it once and I continue to see it again and again and again…a failure to check a fastened joint for pull-through. What is seemingly a simple stress check is often overlooked. This tip provides a quick method to check for pull-through failure anytime...but hopefully you check during the preliminary phase of the design before a failure or a messy redesign is required. A check that readily ascertains whether a composite joint is thick enough, or possesses the minimum inter-laminar shear strength needed to prevent a pull-through failure is discussed in this article.

quick tipPerforming a simple preliminary check for fastener pull-through is good practice. The equation below can be used to calculate the pull-through stress for either countersunk or protruding head fasteners.

Pull Through Equation

pull-through  protruding  fastener  failure

2018-05-07 07:29:39