衝撃荷重を受けるはりの応力の実験的研究 : はりの寸法効果

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  • Experimental Study on the Stresses of Beams Caused by Impact Loads : Size Effect of Beams
  • ショウゲキ カジュウ オ ウケル ハリ ノ オウリョク ノ ジッケンテキ ケンキュウ

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The values of the impact stresses are very important to stuay impact fatigue. So, we studied the size effect of the test pieces for impact load. Impact loads and strains (stresses) of test pieces were measured by wire strain gages. We varied the width (or height) of the test pieces from 7.5 mm to 30 mm, where the height (or width) was constant, 15 mm. We used Matsumura Impact Fatigue Testing Machine, of which the supports were modified to cantilever beams. We obtained the following experimental formulas. ε=0.053 1 b-0.821 h-1.21 U0.5 P=6.56 b0.200 h0.886 U0.5 where ε : strain of the test pieces P : impact load, kg U : impact energy, kg cm b and h : width and height of the test pieces, mm, respectively

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