燕山大学学报2016，Vol.40Issue(5)：413-418,425,7.
非对称截面梁纯弯曲中性层偏移理论解析
Theoretical analysis on strain neutral layer offset of asymmetrical cross-section beam under pure bending
摘要
Abstract
The geometric center layer of the asymmetrical cross⁃section beam doesn′t coincide with the strain neutral layer under pure bending.The exact place of strain neutral layer can′t be accurately calculated by utilizing the traditional theory.Therefore,the calculation of the asymmetrical cross-section beam bending parts′expansion arc length and the curvature after pure bending spring back appear significant deviation.The spring back theory of small curvature plane bending has unique advantages in the analytical analysis of any cross⁃section beam plane bending.As an example,the pure bending of channel steel is studied to calculate the strain neutral layer and the curvature after spring back by utilizing the spring back theory of small curvature plane bending.The theoretical calculation results are consentaneous compared with the experimental data. The calculation accuracy can achieve the accuracy requirement of precision machining.The analysis results of the channel steel pure bending show that the relative offset rate of neutral layer is closely related with the cross⁃section geometry features,the material properties,the initial curvature and bending curvature. All of them have non⁃linear relationship. The theoretical results have important engineering value in the precise bending and straightening of asymmetric cross⁃section steels.关键词
非对称截面/纯弯曲/中性层/槽钢/中性层相对偏移率Key words
asymmetrical cross-section/pure bending/neutral layer/channel steel/relative offset rate of neutral layer分类
矿业与冶金引用本文复制引用
殷璟,梁荣..非对称截面梁纯弯曲中性层偏移理论解析[J].燕山大学学报,2016,40(5):413-418,425,7.基金项目
宁波市自然科学基金资助项目 （）
