考虑塑性变形和相变耦合效应的<strong>NiTiNb</strong>记忆合金管接头装配性能模拟

doi:10.11900/0412.1961.2019.00197

金属学报

2020, Vol. 56

Issue (3): 361-373 DOI: 10.11900/0412.1961.2019.00197

研究论文

本期目录 | 过刊浏览

考虑塑性变形和相变耦合效应的NiTiNb记忆合金管接头装配性能模拟

陈翔^1,^2,³,陈伟¹,赵洋¹,禄盛^1,³,金晓清²,彭向和²(

)

1. 重庆邮电大学先进制造工程学院重庆 400065
2. 重庆大学机械传动国家重点实验室重庆 400044
3. 西安交通大学机械结构强度与振动国家重点实验室西安 710049

Assembly Performance Simulation of NiTiNb Shape Memory Alloy Pipe Joint Considering Coupling Effect of Phase Transformation and Plastic Deformation

CHEN Xiang^1,^2,³,CHEN Wei¹,ZHAO Yang¹,LU Sheng^1,³,JIN Xiaoqing²,PENG Xianghe²(

)

1. School of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
3. State Key Laboratory for Strength and Vibration of Mechanical Structural, Xi'an Jiaotong University, Xi'an 710049, China

引用本文:

陈翔,陈伟,赵洋,禄盛,金晓清,彭向和. 考虑塑性变形和相变耦合效应的NiTiNb记忆合金管接头装配性能模拟[J]. 金属学报, 2020, 56(3): 361-373.
Xiang CHEN, Wei CHEN, Yang ZHAO, Sheng LU, Xiaoqing JIN, Xianghe PENG. Assembly Performance Simulation of NiTiNb Shape Memory Alloy Pipe Joint Considering Coupling Effect of Phase Transformation and Plastic Deformation[J]. Acta Metall Sin, 2020, 56(3): 361-373.

全文: PDF(6436 KB) HTML

摘要:

基于考虑塑性变形和相变耦合效应的记忆合金(SMA)本构模型，对NiTiNb SMA管接头从扩径预处理到装配服役的全过程以及拉拔过程进行数值模拟。计算结果表明，由于相变和塑性变形的耦合作用，装配过程管接头内的von Mises应力、等效相变应变和等效塑性变形演化存在明显的规律。在一定尺寸范围内，随着扩径量的增加，拉拔力降低；不同壁厚尺寸配比的9种方案中，拉拔力随壁厚非线性变化，存在最优连接性能的方案；在室温变化范围内(0~40 ℃)，服役环境温度对管接头连接系统的性能影响较小。随着临界相变应变的增加，管接头内的von Mises应力集中层由内侧向外侧移动，拉拔力在临界相变应变0.07~0.14的范围内逐渐增加。研究结果表明，接触时端部von Mises应力集中会显著增加系统的拉拔力。

关键词 ：形状记忆合金, 管接头, 相变, 塑性变形, 拉拔力

Abstract：

The pipe joints based on shape memory alloy (SMA) are widely used in various fields of fluid transport by virtue of their simple structure, easy assembly and high reliability. However, due to the complexity of the NiTiNb constitutive model, the plastic deformation and its effects have yet not been considered in the report of pipe joint connection system. In view of this background, this work constructs an SMA joint-steel pipe system (J-P system) and performs the finite element numerical simulation of the assembling process based on an SMA phenomenological constitutive model, where in the plastic-phase transformation coupling effect is considered. By altering the diameter expansion, wall thickness, service temperature and critical phase transformation, the change features of the von Mises stress, contact pressure and pull-out force of the J-P system are investigated. The results show that due to the coupling effect of phase transformation and plastic deformation, the evolution of Mises stress, equivalent transformation strain and equivalent plastic deformation in SMA joint show obvious regularity during assembly: in the loading stage, the phase transformation strain and plastic deformation increase with the increase of predeformation. At each subsequent loading step, the plastic strain remains unchanged. At the unloading stage, von Mises stress decreases and phase transformation strain remains unchanged. With temperature increase, the phase transformation strain decreases significantly and von Mises stress increases. At subsequent loading steps, von Mises stress and phase transformation strain remains unchanged. Within a certain size, the pull-out force decreases with the increase of diameter expansion; Among the 9 schemes with different wall thickness ratios, the pull-out force changes non-linearly with the wall thickness, and there is an optimal connection performance scheme. Within the range of room temperature (0~40 ℃), the service temperature has little impact on the performance of the J-P system; With the increase of the critical phase transformation, the stress concentration layer within the SMA joint moves from the inside to the outside, and the pull-out force increases gradually within the range of the critical phase transformation from 0.07 to 0.14. The results also show that the stress concentration at the end of contact region can significantly increase the pull-out force of the J-P system.

Key words： shape memory alloy pipe joint phase transformation plastic deformation pull-out force

收稿日期: 2019-06-18

ZTFLH:

TG139

基金资助:国家自然科学基金项目(11802047);国家自然科学基金项目(51807019);重庆市基础与前沿项目(cstc2016jcyjA0594);重庆市基础与前沿项目(cstc2016jcyjA0443);机械传动国家重点实验室开放课题项目(SKLMT-KFKT-201711);机械结构强度与振动国家重点实验室开放基金项目(SV2018-KF-28)

作者简介: 陈翔，男，1987年生，副教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00197 或 https://www.ams.org.cn/CN/Y2020/V56/I3/361

图1 NiTiNb管接头-钢材管道(J-P)系统2D模型

表1 NiTiNb SMA J-P系统3D模型尺寸 (mm)

图2 NiTiNb J-P系统有限元3D模型及剖视图

图3 装配及拉拔过程示意图以及各阶段不同变量的变化关系曲线

图4 装配过程SMA管接头内选取点的von Mises应力和环向应力变化

图5 装配步骤2到3对应加载点SMA管接头截面上von Mises应力和环向应力分布云图

图6 加载步结束时SMA管接头横截面von Mises应力、等效相变应变和等效塑性应变分布云图

图7 不同扩径量(h)下的von Mises应力云图

图8 不同h下NiTiNb SMA管接头内表面接触压力云图

图9 拉拔力与扩径量变化关系图

表2 NiTiNb SMA 管接头尺寸参数设定表 (mm)

表3 被连接管尺寸参数设定表 (mm)

表4 NiTiNb J-P系统尺寸参数设定方案表 (mm)

图10 方案1~9的NiTiNb SMA管接头内表面接触压力云图

图11 接触面积和拉拔力随被连接管外半径变化关系曲线

图12 拉拔力随温度变化曲线

图13 不同临界相变应变(εL)下的应力-应变曲线

图14 不同临界相变应变下NiTiNb J-P 系统的von Mises应力云图和NiTiNb SMA管接头横截面von Mises应力云图

图15 不同临界相变应变下管接头内表面接触压力云图

图16 临界相变应变与拉拔力关系曲线

图17 不同因素对拉拔力的影响比重

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