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The test consisted of imposing 50 lbs to
1750 lbs for 1 million cycles. The grade ring did show permanent deformation
at the conclusion of the test. The purpose of this test was to show whether
cyclic loading would affect the structural integrity.
This
test provided durability results. Although the grade ring took a permanent
deformed set at the end of the test, the potential of water infiltration
due to cracking was not evident. |