OCE performed a forensic failure analysis on a damaged mining lift hook. As a worker was lifting and moving a cylindrical metal basket loaded with parts from a process tank, the lift hook bracket assembly that secured the basket to the crane hook had failed. As a result, the basket loaded with parts, weighing approximately 1400 to 1600 pounds, had fallen and struck the employee.
We were retained by an attorney to investigate to evaluate the safety, design and structural integrity of the lift hook bracket assembly and determine the root cause of the accident. A three dimensional finite element model of the lift hook assembly was performed, consisting of over 75,000 elements and 120,00 nodes to evaluate the failure mode. The results determined that the hook failed by metal fatigue.
In addition to engineering design, analysis and troubleshooting services – we also perform forensic engineering investigations. Call to discuss your engineering challenges.