Ti-6Al-4V合金における単一過大荷重下の低サイクル疲労き裂進展特性

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In this study,the low cycle fatigue deformation properties and the surface crack propagation behaviour of α/β-rolled plates of Ti-6Al-4V alloy with conventionally annealed equiaxial microstructure were investigated under the constant strain amplitude and the single and the single over-straining conditions.Two types of the single over-straining were performed;that is,tension only (T waveform) and tension-compression (T-C waveform) over-straining,and the effects of the overstraining ratio λ on the cyclic deformation and the crack acceleration or the crack retardation behavior were also studied from the stand-point of the changes in crack opening desplacement Φ and tensile peak stress σ_<pt>.As the results,in the T waveform test in the renge of λ≧1.62,the crack ratardation occurred when compared with the crack propagation of the constant amplitude test,and the retardtion effect increassed with the ratio λ.On the other hand,in the T-C waveform test,the crack propagation curve after over-straining was almost coincident with the curve of the constant amplitude test.It became clear that the retardation behaviour of surface crack propagation after the over-straining of the T waveform resulted from both of the changes in Φ and σ_<pt> after the over-straining.The relation between the crack propagation rate da/dN and the J integral range ΔJ under the over-straining conditions was in good agreement with the da/dN and ΔJ relation of the constant strain amplitude test.
社団法人日本材料学会の論文
1993-10-15

Ti-6Al-4V合金における単一過大荷重下の低サイクル疲労き裂進展特性

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