EVALUATION DEVICE OF EDGE ELONGATION OF PLATE

To enable proper evaluation of elongation characteristic of an edge part of a plate regardless of an edge shape thereof.SOLUTION: An evaluation device 10 of an edge W1 elongation of a plate W comprises a convex type 11 and a concave type 12. The concave type 12 includes an insertion hole 16 into which a push-in part 15 of the convex type 11 can be inserted. The insertion hole 16 is a notch configuration where a peripheral edge part 17 of the insertion hole 16 at the insertion start side is a convex surface over the whole area. Curvature of the peripheral edge part 17 is relatively small at the portion near the notch part 16a of the insertion hole 16, and relatively large at the portion far from the notch part 16a.SELECTED DRAWING: Figure 4 【課題】板材の縁部形状によらず、当該縁部の伸び特性を適正に評価可能とする。【解決手段】板材Ｗの縁部Ｗ１伸び評価装置１０は、凸型１１と、凹型１２とを備える。凹型１２は、凸型１１の押込み部１５を挿通可能な挿通穴１６を有する。挿通穴１６は切り欠き形状をなし、挿通穴１６の挿通開始側の周縁部１７はその全域にわたって凸曲面形状をなす。周縁部１７の曲率が、挿通穴１６の切り欠き部分１６ａに近い側で相対的に小さく、切り欠き部分１６ａから遠い側で相対的に大きい。【選択図】図４