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本文分析了螺纹铜在横筋顺轧制方向一侧根部冷弯横裂的各种可能原因,最后得出结论:对20MnSi、25MnSi螺纹钢筋,其横裂产生的根本原因是两种应力的叠加超过了材料本身的强度。第一种应力集中来自横筋改变了正常的应力分布而造成其两侧根部应力线密度高于其它部位。第二种应力集中是仅仅存在于横筋顺轧制方向一侧根部因流线断裂造成的应力集中。文章分析了两种应力集中的成因并提出了缓解办法,基本上消除了螺纹钢的弯曲横裂。
In this paper, the possible reasons for the cold bending and transverse cracking of the copper wire on the one side of the cross bar along the rolling direction are analyzed. Finally, the conclusion is drawn that the fundamental reason for the transverse cracking of the 20MnSi and 25MnSi rebar is that the superposition of the two stresses exceeds The strength of the material itself. The first stress concentration is due to the fact that the transverse bars change the normal stress distribution, resulting in a higher density of stress lines on both sides of the root than on the other sites. The second type of stress concentration is the stress concentration that exists only at the root of one side of the cross bar along the rolling direction due to streamline fracture. The paper analyzes the causes of the two stress concentrations and puts forward the mitigation measures, basically eliminating the bending and transverse cracking of the rebar.