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Failure Analysis
Theater Seats
The failure analysis of the theater seats (above left) is typical of the assessments performed by BEAR. The seats' backs were held on in the back by 2 bolts, one on each side, through a small metal tab (above right). To determine the loads on the tab when a seat was used by various persons, strain gauges were installed on a seat (lower left) and peak loads recorded. To determine the peak stresses in the corner of the tab and the fatigue life of the seat, the field measured loads were applied to a computer model of the tab (lower right). As expected, the tab dimensions were determined to be inadequate.
click image for a larger view
Aircraft Engine Components
The connecting rod shown here was analyzed for stress concentrations in both the connecting rod and the bolts used to hold it together. A parametric study of bolt pre-loads was performed using finite element analysis to determine the necessary bolt pre-load to reduce stress below a critical level. The results were used to determine the cause of a failure and new pre-load specifications to prevent future failures. |
 click image for a larger view
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