Study on Fatigue Strength of FCD 600 under Cyclic Compressive Load.

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  • ＦＣＤ６００の圧縮荷重下における疲労強度に関する研究
  • FCD600 ノ アッシュク カジュウ カ ニ オケル ヒロウ キョウド ニ カンスル ケンキュウ

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Abstract

Fatigue tests of spheroidal graphite cast iron FCD600 were carried out under cyclic compressive load using round bars with circumferential notch.Cracks were observed propagating at the notch bottom of the specimens that were not fractured after 1×107 cycles under the repeated compressive load.The change of the stress intensity factor range =K accompanied by the crack propagation was studied based on fracture mechanics, considering the residual tensile stress distribution due to the plastic deformation.The applied and residual stresses were calculated by elastic-plastic finite element method.=K was compared with =Kth of short crack taking intrinsic crack length ao into consideration, and it was considered that crack propagation is stop at the depth of =K<=Kth.The estimated value of crack propagation depth is in good agreement with the experimental value.

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