CAJ | 학술논문

船体结构焊接过程中，焊缝附近局部热胀冷缩作用产生的焊接残余应力，是影响船体结构强度的重要因素。为了深入清晰地分析焊接残余应力对船体结构强度的影响，文章采用非线性热-力耦合有限元方法以及热弹塑性材料模型，建立焊接残余应力与结构外载荷的连续计算的瞬态有限元模型，对比分析了考虑和不考虑焊接残余应力两种情况下的结构强度结果。结果表明，考虑焊接残余应力时，船体结构强度的薄弱环节位置发生了变化。因此证明在船体局部结构设计中，必须考虑焊接残余应力计算结果，且可采用文中研究的焊接结构计算与船体强度计算相结合的瞬态连续模型。
선체결구한접과정중，한봉부근국부열창랭축작용산생적한접잔여응력，시영향선체결구강도적중요인소。위료심입청석지분석한접잔여응력대선체결구강도적영향，문장채용비선성열-력우합유한원방법이급열탄소성재료모형，건립한접잔여응력여결구외재하적련속계산적순태유한원모형，대비분석료고필화불고필한접잔여응력량충정황하적결구강도결과。결과표명，고필한접잔여응력시，선체결구강도적박약배절위치발생료변화。인차증명재선체국부결구설계중，필수고필한접잔여응력계산결과，차가채용문중연구적한접결구계산여선체강도계산상결합적순태련속모형。
During ship manufacturing, welding residual stresses produced in the materials during welding process because of local thermal expansion and contraction, which would affect the strength of ship structures. To study the influence of welding residual stresses on the strength of ship struc-tures, a continuous transient simulation model are proposed, which adds extra external loads follow-ing with the thermal-mechanical welding simulation model. The model is used to analyze the strength data with and without welding residual stress. The results show that the position of structural weak-ness are transformed by welding residual stresses. From this study, it can be concluded that residual stresses must be included in strength design of local crucial hull and the continuous transient model is a valid calculation approach.