Ian St. Louis

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Blurred grayscale electron microscope close-up of a fracture surface with a curved mirror zone and ridged hackles

Project 03 of 09

Post-mortem Analysis of Brittle Fast-Fracture in a Skateboard

How and why a skateboard deck failed the way it did, and how to mitigate it.


Context
UC Berkeley · ME 224
Role
Failure analysis (team of four)
Tags
Failure analysis, Fractography, SEM

In the following report, myself and three other mechanical engineers (Richard Didham, Phillip Downey and Megan Bahn) did a postmortem analysis of a fractured skateboard deck. To keep it simple: we wanted to how and why this skateboard failed the way it did. From this analysis we provided solutions to mitigate the events that led up to failure in this particular way.

Postmortem analysis is an immensely important topic in engineering, which helps inform much smarter and safer design choices for future products.

I would like to acknowledge the fantastic support of Evan Brown (PhD, PE) and Nathan Bailey (PhD) of Exponent Failure Associates for their massive contribution of SEM images to this study. Our team had little access to better imaging equipment than simple optical microscopy, which, even at the right resolution and magnification, often fails to highlight important topological features of a fracture surface.

The Report

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The Report
Annotated electron microscope image of a skateboard fracture at a drill hole, labeling hackles, mirror zone, chip origin, stress discontinuity point and planar fracture surface; 1 mm scale