安全、健康和环境2025，Vol.25Issue(2)：18-25,8.DOI:10.3969/j.issn.1672-7932.2025.02.003
腐蚀环境下石化压力仪表力学-化学耦合分析
Mechanical-chemical Coupling Analysis of Petrochemical Pressure Sensor Under Corrosive Environment
摘要
Abstract
Petrochemical pressure sensor mainly operates in complex and harsh on-site environments,where its′ reliability has always been seriously threatened.Aiming at the unclear degradation mechanism of pressure sensor under corrosive conditions,a finite element model was established.A thermal-mechanical coupling anal-ysis was conducted to examine the distribution of parameters such as stress,temperature,and deformation within the core body,comparing the variation of each parameter before and after loading current.Subsequently,the in-teraction mechanism between thermal stress and corrosion defects was elucidated through a mechanical-chemical coupling analysis.The variations in the maximum stress of the core body′s aluminum encapsulation layer under different corrosion depths and deformations were compared.The results show that the stress distribution of the a-luminum encapsulation layer of the core body is relatively uniform under the condition without current loading.However,under the thermal steady-state condition,the local stress occurs at the center position of the aluminum encapsulation layer.The maximum stress difference between the center and the edge positions reaches 2.8 MPa.Furthermore,under the combined effects of high temperature and corrosion,the aluminum encapsulation layer develops corrosion defects.The maximum stress is observed at the center of these defects and is symmetri-cally distributed on either side of the defect′s center.As the depth of the corrosion defect increases,so does the maximum stress,which escalates by nearly 6.1%compared to the thermal steady-state condition.Uneven stress distribution across the aluminum encapsulation layer expedites the material degradation,potentially leading to a plastic deformation or fracture of the core body,thereby hindering accurate pressure sensing.The research re-sults provide a reference for the performance analysis of petrochemical pressure sensor,and also provide data support for the reliability improvement of pressure sensor in other industries.关键词
压力仪表/芯体/力学-化学耦合分析/腐蚀缺陷/应力集中Key words
pressure sensor/core body/mechanical-chemical coupling analysis/corrosion defects/stress concentration分类
机械工程引用本文复制引用
代思洋,曹德舜,李娜,王昊..腐蚀环境下石化压力仪表力学-化学耦合分析[J].安全、健康和环境,2025,25(2):18-25,8.基金项目
中国石化科技部项目(324103),石化仪控关键硬件故障预知与寿命预测研究. （324103）
