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为了研究拉矫破鳞过程中,压应力对氧化膜剥落的作用,建立了氧化膜的薄板模型,推导出氧化膜长度与临界荷载之间的关系,利用差分法理论计算出失稳条件下的临界荷载公式。模型中的材料参数氧化膜弹性模量由纳米压痕实验测得为145GPa,基体与氧化膜的结合力系数由拉伸实验测得为18.2MPa/m;利用拉矫破鳞机对带钢施加100、150、200MPa的压应力作用,通过金相实验观察统计出断裂后的残余长度,并与理论计算的残余长度进行对比,验证得到拉矫破鳞实验得出的断裂长度与差分法理论计算出的残余长度的结果相差小于12%。研究表明氧化膜受压断裂,理论推导出的临界残余氧化膜长度与实际受压断裂氧化膜长度相近;临界荷载公式表明压应力与残余氧化膜最大长度呈平方反比关系。
In order to study the effect of compressive stress on exfoliation of oxide film during the process of straightening and crushing, a thin plate model of oxide film was established and the relationship between the length of oxide film and the critical load was deduced. Using the theory of difference method, Critical load formula. In the model, the elastic modulus of oxide film was 145GPa measured by nano-indentation experiment, and the bond coefficient between matrix and oxide film was 18.2MPa / m by tensile test. 100,150,200MPa compressive stress, the residual length after fracture was calculated by metallographic observation and compared with the theoretical residual length, and the fracture length and the difference method were calculated theoretically Residual length of the results of a difference of less than 12%. The results show that the compressive fracture of the oxide film and the theoretical residual oxide film length are similar to those of the actual compressive fracture film. The critical load formula shows that the compressive stress has a square inverse relationship with the maximum length of the residual oxide film.