Effects of Texture on Fatigue Crack Propagation of Low-carbon Steel

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Plane bending fatigue tests were carried out on several kinds of hot-rolled low-carbon steel sheets with texture to clarify the effects of texture on fatigue crack propagation. The crack growth rate of each material was determined uniquely by a term σ<sub><i>a</i></sub><sup><i>n</i></sup><i>l</i>, where σ<sub>a</sub> is nominal stress amplitude, <i>l</i> is the crack length, and <i>n</i> is a material constant. The <i>n</i> exhibited different values according to the materials, whereas there is not so much difference in the σ<sub>B</sub> of each material. The different <i>n</i> in such materials may result from the difference in texture. Moreover, the value of <i>n</i> tended to decrease with an increase in <i>r</i> value, plastic anisotropy ratio. The analysis based on the small-crack growth law, <i>dl/dN</i>=<i>C</i><sub>3</sub>(σ<sub>a</sub>/σ<sub>B</sub>)<sup><i>n</i></sup><i>l</i>, in which the effect of a material property was considered, suggested that the effect of texture on the value of <i>C</i><sub>3</sub> is negligible. The reciprocal of <i>C</i><sub>3</sub> represents the resistance to small crack propagation in each material.


  • Transactions of the Iron and Steel Institute of Japan  

    Transactions of the Iron and Steel Institute of Japan 37(12), 1180-1188, 1997-12-15 

    The Iron and Steel Institute of Japan

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