Construction of Best Fit Fatigue Curve and Mean Stress Correction Method for Aluminum Alloy 6061-T6

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  • アルミニウム合金6061-T6の最適疲労曲線の構築と平均応力の補正方法
  • アルミニウム ゴウキン 6061-T6 ノ サイテキ ヒロウ キョクセン ノ コウチク ト ヘイキン オウリョク ノ ホセイ ホウホウ

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Abstract

Aluminum alloys of 6061-T6 have been applied as a liner for Type III composite cylinders. Load-controlled fatigue tests were performed on sever-al kinds of 6061-T6. The fatigue strength shows dependency on the ten-sile strength and there is no clear fatigue limit in the high fatigue life range of 107-108 cycles. Based on these results, the best fit fatigue curve (BFC) of 6061-T6 was constructed for the fatigue analysis. An equation of the BFC includes tensile strength as a parameter. The superiority of the constructed BFC was verified by comparing it with that of the ASME code and the DOD handbook. The mean stress correction methods for the BFC of 6061-T6 were also discussed. A selected equation of the method is applicable to the both cases of tensile and compressive mean stresses. The superiority of the selected equation was verified by comparing it with that of the DOD handbook.

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