10CrNi3MoV钢焊接接头夏比吸收功与CTOD值的关系及其在安全评定中的应用

Correlation between charpy energy and CTOD value of 10CrNi3MoV steel weld joint and its application to safety assessment

在结构安全评定时,材料的断裂韧度常由CTOD特征值δC表征。但CTOD试验十分复杂,在许多实际场合可行性不高。与之相对,用于测定材料冲击韧性的夏比冲击试验简单易行,吸收功AKV应用广泛。为了方便船体焊接接头的安全评定工作,考察了10CrNi3MoV钢焊接接头的δC与AKV的数值关系,建立了两者之间的估算公式。基于大量试验,应用结构完整性评定SINTAP方法对两副等匹配接头进行安全评定。结果表明,与利用CTOD特征值的第1级评定结果相比,基于估算公式、利用夏比吸收功Akv完成的第0级评定具有一定保守性;但两者结论相差不大,吻合度较好。

For safety assessment of metal structures,material toughness is usually characterized by CTOD critical value δc.Unfortunately this test is so complicated that it＇s impractical in many actual cases.In contrast,Charpy V-notched impact test is quite simple and the absorbing energy A kv is widely used.In order to facilitate the assessment work of weld joints in shipbuilding,this paper is mainly concerned with the numeric relation between A Kv and δc of 10CrNi3MoV steel weld joint. Based on existing studies,the paper set up an estimation formula.As shown in the evaluation of 2 joints with SINTAP approach,with the equation proposed by this paper,the level 0 assessment based on Charpy test agrees well with the level 1 based on CTOD test in spite of a little conservation.And that could indicate the application is acceptable in certain occasions.