PROBLEM TO BE SOLVED: To provide a bending fatigue testing device capable of executing accurately a bending fatigue test, without generating local plastic strains, when restoring bending due to an abnormal force and repeated bending caused by a friction force, or the like, in a test piece.;SOLUTION: This bending fatigue testing device is constituted of a swing arm 9 attached engagedly to a driving shaft 8a of a stepping motor 8 attached to an attaching frame 2; a pair of bending guiding/holding members 6, 7 fixed to a seat plate 5 arranged in the attaching frame 2 and formed with a circular arc curved face R curved with a prescribed curvature radius; and a run-off part for releasing a clamping force to an opposing side; a test piece holding part 11 fit around slidably a tip part side of the swing arm 9, and for clamping one end of the test piece 16 with the other end side clamped by the pair of bending guiding/holding members 6, 7; and a coil spring 12, having one end side connected to the tip part side of the swing arm 9 and for energizing the test piece holding part 11 to a tip part direction of the swing arm 9.;COPYRIGHT: (C)2008,JPO&INPIT
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