Aluminum Failure Analysis
Stadium Chair Collapse
A woman injured her back while watching a sporting event when the stadium chair she was sitting in suddenly collapsed.
The stadium chair slats (on which people sit) are supported by two side arms made from die cast aluminum. In the incident investigated the failure occurred in the high-stress area of the die cast aluminum side arms, as seen below.
A field examination of a large number of stadium chairs revealed that a significant percentage of them exhibited incipient cracks at the same location where the evidence stadium chair abruptly failed.
Chemaxx's concluded that the stadium chairs had a design defect and that more likely than not, the chairs would continue to fail over time. Chemaxx made further recommendations to inspect and repair all similar stadium chairs throughout the country.
Dr. Fox is a nationally recognized metallurgy expert, corrosion expert and failure analysis expert who has published numerous peer-reviewed, scientific papers in these fields. He worked for years as a bench scientist and a research manager in the fields of corrosion, metallurgy and failure analysis of materials.
Dr. Michael Fox, the Founder of Chemical Accident Reconstruction Services
(www.chemaxx.com), can be contacted at email@example.com
©2008 CHEMAXX, INC