压力容器
壓力容器
압력용기
2013年
9期
31-38
,共8页
双平板封头%焊接残余应力%有限元%单元生死技术
雙平闆封頭%銲接殘餘應力%有限元%單元生死技術
쌍평판봉두%한접잔여응력%유한원%단원생사기술
double-layer flat head%welding residual stress%finite element%element birth and death tech-nology
双平板封头结构最常见的问题是面板与工艺接管焊接部位开裂引起泄漏，而焊接残余应力是重要的影响因素之一。基于ANSYS软件中的APDL语言、单元生死技术以及热-结构间接耦合法对双平板封头结构焊接温度场、应力场进行了数值模拟，获得了焊接残余应力的大小与分布规律。计算结果表明：在焊缝区环向应力水平较高，易诱使焊缝开裂失效；在焊缝附近区域产生了较大压应力，主要是由于焊缝区材料受热向外膨胀而产生。模拟结果为焊接残余应力评定、控制焊接残余应力提供了理论依据，并对提高双平板封头结构的可靠性和安全性具有重要意义。
雙平闆封頭結構最常見的問題是麵闆與工藝接管銲接部位開裂引起洩漏，而銲接殘餘應力是重要的影響因素之一。基于ANSYS軟件中的APDL語言、單元生死技術以及熱-結構間接耦閤法對雙平闆封頭結構銲接溫度場、應力場進行瞭數值模擬，穫得瞭銲接殘餘應力的大小與分佈規律。計算結果錶明：在銲縫區環嚮應力水平較高，易誘使銲縫開裂失效；在銲縫附近區域產生瞭較大壓應力，主要是由于銲縫區材料受熱嚮外膨脹而產生。模擬結果為銲接殘餘應力評定、控製銲接殘餘應力提供瞭理論依據，併對提高雙平闆封頭結構的可靠性和安全性具有重要意義。
쌍평판봉두결구최상견적문제시면판여공예접관한접부위개렬인기설루，이한접잔여응력시중요적영향인소지일。기우ANSYS연건중적APDL어언、단원생사기술이급열-결구간접우합법대쌍평판봉두결구한접온도장、응력장진행료수치모의，획득료한접잔여응력적대소여분포규률。계산결과표명：재한봉구배향응력수평교고，역유사한봉개렬실효；재한봉부근구역산생료교대압응력，주요시유우한봉구재료수열향외팽창이산생。모의결과위한접잔여응력평정、공제한접잔여응력제공료이론의거，병대제고쌍평판봉두결구적가고성화안전성구유중요의의。
The key problem of double -layer flat head structure is the leakage induced by the crack in the welding position between the panel and the nozzle .Welding residual stress is one of the main influential factors.In this work,numerical simulation on welding temperature field and thermal stress of double -lay-er flat head structure was carried out based on APDL of ANSYS software ,element birth and death technol-ogy and thermal -mechanical coupling method , and the distribution law of welding residual stress was found out .The simulation results indicate that the hoop stress is much larger at the welding zone , which easily induces the cracking and leakage sometimes .The compressive stress is very high near the welding zone ,and it is mainly caused by the expansion of heating welding material .The analysis from calculation results provides some theory references for evaluating and controlling the welding residual stress .It is of great significance for increasing the reliability and safety of double -layer flat head structure .
