[1]邹 旭,李 扬. 超低温加、卸载下石灰岩的弹性模量[J].湖北工业大学学报,2022,(4):103-106+110.
　ZOU Xu,LI Yang. Study on Elastic Modulus of Limestone Under Ultra-low Temperature Loading and Unloading[J].,2022,(4):103-106+110.
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 超低温加、卸载下石灰岩的弹性模量()
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《湖北工业大学学报》[ISSN:1003-4684/CN:42-1752/Z]

卷:
期数:
2022年第4期
页码:
103-106+110
栏目:
湖北工业大学学报
出版日期:
2022-08-28

文章信息/Info

Title:
 Study on Elastic Modulus of Limestone Under Ultra-low Temperature Loading and Unloading
文章编号:
1003-4684(2022)04-0103-04
作者:
 邹 旭;  李 扬
 湖北工业大学土木建筑与环境学院， 湖北 武汉 430068
Author(s):
 ZOU Xu; LI Yang
 School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China
关键词:
 ; 石灰岩;  超低温;  加、卸载;  弹性模量;  本构模型
Keywords:
 ; limestone;  ultra-low temperature;  loading and unloading;  elastic modulus;  constitutive model
分类号:
TU502
文献标志码:
A
摘要:
 为加强我国液化天然气(liquefied natural gas, LNG)罐研发和设计能力，结合实际LNG储罐的应用环境，利用自行研制的超低温试验箱对石灰岩材料开展低温与荷载耦合的应力-应变测试。给石灰岩试件施加由0至3.14 MPa的单向轴压荷载，并让石灰岩所处温度由0℃降至-165℃。实验结果表明：加、卸载过程中，弹性模量随温度降低均表现为先减后增趋势；加载过程中的测量值均大于卸载过程的测量值，且曲线重合度较好；经历卸载后复加载，弹性模量随温度变化不稳定。另外，基于试验结果构建出复合状态下应力[-应变关系式，为后续更加深入了解LNG罐体的力学性能提供模型的分析依据。
Abstract:
 In order to strengthen the research and design capabilities of my country’s liquefied natural gas (LNG) tanks, this paper combined with the actual LNG storage tank application environment, using the self-developed ultra-low temperature test chamber to carry out low temperature and load coupled stress-strain tests on limestone materials. Applying a uniaxial axial load of 0 to 3.14 MPa to the limestone specimen and reduce the temperature of the limestone from 0 °C to -165 °C. In order to reduce the contingency and error of data collection, this experiment uses hierarchical addition and unloading methods to strengthen the parameter measurement of limestone. The experimental results show that during the process of adding and unloading, the elastic modulus decreases with the temperature and then decreases first and then increases. The measured values during the loading process are larger than the measured values of the unloading process, and the curve coincidence degree is better. Loading, the elastic modulus is unstable with temperature. In addition, based on the experimental results, the stress-strain relationship in the composite state is constructed, which provides a model basis for further understanding of the mechanical properties of the LNG tank.

参考文献/References:

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备注/Memo

备注/Memo:
［收稿日期］ 2021-06-28
［基金项目］ 湖北工业大学科研启动基金（BSQD14044）
［第一作者］ 邹 旭(1997-)，男，湖北保康人，湖北工业大学硕士研究生，研究方向为极端温度下材料力学性能
［通信作者］ 李 扬(1986-)，男，宁夏石嘴山人，工学博士，湖北工业大学副教授，研究方向为极端环境工程结构可靠性
更新日期/Last Update: 2022-08-29