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在管线钢管成形过程中,因为正反两个方向塑性变形发生不同程度的变化,使管体和毛坯板之间的屈服强度产生差异。以国内某厂生产的X90钢板为研究对象,采用正向预拉伸—卸载—反向压缩的试验方法,分析了在不同程度的预变形条件下,材料的反向屈服强度的变化规律。结果显示,随着预应变的增加,板料反向屈服强度呈现先降低后升高的趋势,预应变为5.455%时,反向屈服强度取得最小值。基于Hodge强化理论建立了这种材料的反向屈服强度预测模型,并通过ABAQUS二次开发,实现了X90管线钢单次反向加载条件下的屈服强度预测。验证结果表明:模型预测结果与实验结果吻合较好,相对误差未超过2%。
In the pipeline forming process, because the plastic deformation in both directions of positive and negative changes occur in varying degrees, so that the difference between the yield strength of the tube body and the blank plate. With the test method of forward pre-tensioning-unloading-reverse compression, X90 steel produced in a factory in China is studied. The variation law of the reverse yield strength of the material under different pre-deformation conditions is analyzed. The results show that with the increase of pre-strain, the reverse yield strength of the sheet first decreases and then increases. When the pre-strain is 5.455%, the yield strength of the sheet reaches the minimum value. Based on Hodge ’s theory of reinforcement, the prediction model of reverse yield strength of this kind of material was established. By ABAQUS secondary development, the yield strength prediction of X90 pipeline steel under single reverse loading was realized. The verification results show that the model predictions agree well with the experimental results, and the relative error does not exceed 2%.