锻压技术

板条扭曲变形初步分析与试验研究

英文标题：Preliminary analysis and experimental research on twisting deformation of slats

作者：王磊张如华

分类号：TG386；TG14

出版年,卷(期):页码：2019,44(3):175-180

摘要：

建立了忽略厚度、轴向缩短和宽度变窄等因素的板条扭曲变形几何模型。分析表明，变形程度与长度负相关、与宽度和扭曲角正相关，且宽度影响敏感性。参照已有的研究和有关材料性能试验标准进行试样设计，在Q235钢棒上截取了2种宽度、3种厚度、统一长度，纤维分别沿纵向、横向和厚向分布的试样，利用特制的试验装置完成了直接扭曲试验，得出了极限扭曲变形数据。两者对比结果表明，厚度较小，容易失稳，厚度增大，不易失稳，但易破裂；实际的纯扭曲变形中，不能忽略板条轴向缩短、宽度变窄对变形带来的影响，文献中的许用伸长率用作扭曲变形边缘伸长极限判据偏安全；纤维沿纵向分布时扭曲变形性能最好，沿厚向和横向分布时性能均较差。初步判断纯扭曲变形属于复合类变形。

A geometric model of twisting deformation for slat was established without considering the factors of thickness, axial shortening and narrowing of width. The analysis shows that the degree of deformation is negatively correlated with the length, positively correlated with the width and the twist angle, and the width affects sensitivity. Then, the sample design was conducted by referring existing research and related material performance test standards, and two kinds of widths, three kinds of thicknesses, uniform lengths, and longitudinal, transverse and thick directions of the fiber for samples were cut on the Q235 steel bar. The direct twisting test was completed by a special test device, and the ultimate distortion data were obtained. The comparison results show that smaller thickness is easy to lose stability, and thicker thickness is more stable, but easy to break. In the actual pure distortion, the influence of the axial shortening of the slats and the narrowing of the width on the deformation cannot be ignored, and the allowable elongation in the literature used as a criterion for the elongation limit of the torsion deformation edge is safe. Furthermore, when the fibers are distributed in the longitudinal direction, the performance of distortion is the best, and it is poor along the thickness direction and lateral direction. It is preliminarily judged that pure distortion bolongs to composite deformation.

基金项目：

江西省教育厅科学技术研究项目（GJJ171469）

王磊（1985-），男，硕士，讲师，E-mail：413495509@qq.com；通讯作者：张如华（1958-），男，硕士，教授，E-mail:zhangruhua@ncu.edu.cn

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