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首页> 外文期刊>International Journal of Solids and Structures >On the effect of Lüders bands on the bending of steel tubes. Part I: Experiments
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On the effect of Lüders bands on the bending of steel tubes. Part I: Experiments

机译：关于吕德斯带对钢管弯曲的影响。第一部分：实验

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摘要

In several practical applications hot-finished steel pipe that exhibits Lüders bands is bent to strains of 2-3%. Lüders banding is a material instability that leads to inhomogeneous plastic deformation in the range of 1-4%. This work investigates the influence of Lüders banding on the inelastic response and stability of tubes under rotation controlled pure bending. Part I presents the results of an experimental study involving tubes of several diameter-to-thickness ratios in the range of 33.2-14.7 and Lüders strains of 1.8-2.7%. In all cases the initial elastic regime terminates at a local moment maximum and the local nucleation of narrow angled Lüders bands of higher strain on the tension and compression sides of the tube. As the rotation continues the bands multiply and spread axially causing the affected zone to bend to a higher curvature while the rest of the tube is still at the curvature corresponding to the initial moment maximum. With further rotation of the ends the higher curvature zone(s) gradually spreads while the moment remains essentially unchanged. For relatively low D/t tubes and/or short Lüders strains, the whole tube eventually is deformed to the higher curvature entering the usual hardening regime. Subsequently it continues to deform uniformly until the usual limit moment instability is reached. For high D/t tubes and/or materials with longer Lüders strains, the propagation of the larger curvature is interrupted by collapse when a critical length is Lüders deformed leaving behind part of the structure essentially undeformed. The higher the D/t and/or the longer the Lüders strain is, the shorter the critical length. Part II presents a numerical modeling framework for simulating this behavior.
机译：在一些实际应用中，具有吕德斯带的热精加工钢管弯曲到2-3％的应变。吕德斯带是一种材料不稳定性，会导致不均匀塑性变形，范围为1-4％。这项工作研究了Lüders绑扎对旋转控制的纯弯曲下管的非弹性响应和稳定性的影响。第一部分介绍了一项实验研究的结果，该实验涉及直径与厚度比为33.2-14.7的管和Lüders应变为1.8-2.7％的管。在所有情况下，初始弹性状态都在局部力矩最大值处终止，并且在管的拉伸和压缩侧上的较高应变的窄角度Lüders带的局部形核。随着旋转的继续，这些带在轴向上扩展并扩散，从而使受影响的区域弯曲成更高的曲率，而管的其余部分仍处于与初始力矩最大值相对应的曲率。随着端部的进一步旋转，较高的曲率区逐渐扩展，而力矩基本上保持不变。对于相对较低的D / t管和/或较短的Lüders应变，整个管最终会变形为较高的曲率，进入通常的硬化方式。随后，它继续均匀变形，直到达到通常的极限力矩不稳定性为止。对于高D / t管和/或具有较长Lüder应变的材料，当临界长度Lüders变形而留下结构的一部分基本未变形时，较大的曲率的传播会因塌陷而中断。 D / t越高和/或Lüders应变越长，则临界长度越短。第二部分提供了用于模拟此行为的数值建模框架。

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