基于X射线的LNG薄膜板残余应力检测与特性分析

Residual stress detection and characteristic analysis of LNG membrane panel based on X-ray

该文旨在利用X射线衍射法对MARK Ⅲ型LNG(liquefied natural gas,液化天然气)薄膜板进行残余应力检测,以期获得其残余应力分布规律及典型特性。通过布置16个测点,测试不同方向和区域的残余应力特性。结果显示:大波纹和小波纹交叉节点顶部受压,最大压应力可达178 MPa;板面平直区域呈现压应力,大波纹波峰处受拉,拉应力峰值为115 MPa,小波纹波峰处残余应力受板的边界影响而有所增大。研究工作对于LNG薄膜板的使用、设计和维护具有重要指导意义,可为工程实践提供有益参考,为LNG薄膜板的进一步优化和自主国产化提供重要依据。

This paper aims to utilize X-ray diffraction(XRD)method to investigate the residual stress in MARK Ⅲ type LNG(Liquefied Natural Gas)membrane panels.A residual stress analyzer was employed to examine the residual stress distribution and characteristics of the membrane panels.Sixteen measurement points were arranged to analyze the residual stress in different directions and areas.The nodes are under compression and the maximum compressive stress can reach 178 MPa;the flat surface regions exhibit compressive stress,while the peaks of the large and small corrugations experience tensile stress,the maximum tensile stress is 115 MPa.The findings of this research provide valuable guidance for the utilization,design,and maintenance of LNG membrane panels,reducing the risk of structural failure and enhancing stability and reliability.These discoveries offer beneficial insights for future engineering practices,offering crucial support for further optimization and application of LNG membrane panels.