Static Pull Testing & Results

 

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Two qualification tests were performed to provide proof that this new Inconel 718 tiedown was fit for service on an Arleigh Burke destroyer. Specifically, the Shop and Installation test for 4 bar tiedowns was followed as described on Navy reference drawing 1916300, Rev P, page 15. See the “Test Notes” of said drawing for the procedure utilized in these tests. The following report from ATS documents the tests performed and the results. The Inconel 718 fabricated by the DMLS process and heat treated passed all tests proving it meets all Navy requirements for service as a tiedown on an Arleigh Burke destroyer. Our Shop test was actually even more severe than called for on the Navy drawing. The Navy drawing only specifies that an asymmetrical load of 25,000 pounds be applied and then immediately released to pass this test. Instead, we applied the load for one minute and released it and then applied it again and programmed the machine to hold the load for 5 minutes before releasing it. The very high strength hook snapped and broke after 4.5 minutes, dynamically releasing the load suddenly. So impressive is this design that no damage was done to the Inconel 718 tiedown and further it then was tested in a fatigue test for 1 million cycles passing that test also with no damage at all nor any permanent deformation. These corrosive resistant Inconel 718 tiedowns are extremely strong and a significant upgrade from the current Navy tiedowns.