海洋管線管焊縫全壁厚試樣與減薄試樣的CTOD值分析

Analysis on Data Resulting from CTOD Tests with Full-thickness and Sub-sized Weld Specimens of Offshore Pipeline

摘要: 在海洋管線管的CTOD試驗(yàn)中,焊縫試樣通常都是在不壓平試塊的前提下取最大厚度試樣,因焊管存在弧度,所取的試樣均屬于減薄試樣。由于CTOD值存在尺寸效應(yīng),因此CTOD值與試樣厚度有較大的相關(guān)性。為此,選取4種不同規(guī)格、不同材質(zhì)的試樣進(jìn)行CTOD試驗(yàn),并對(duì)其試驗(yàn)結(jié)果進(jìn)行分析比較。試驗(yàn)分析結(jié)果表明,焊縫全壁厚試樣的CTOD值總體高于減薄試樣的CTOD值。

Abstract: For the CTOD fracture toughness test to the offshore pipeline,normally the weld test specimen is taken from a test block that is not flatted in order to ensure the maximum specimen thickness,and due to the presence of the weld pipe curvature,it is in any case a sub-sized one. Owing to the size effect of the CTOD value,there exists relevance between such value and the specimen thickness. Therefore CTOD tests are conducted with specimens taken from four pipes with different sizes and steel types,and the results are comparatively analyzed,showing that the CTOD values from the full-thickness weld specimens are overall better than those from the sub-sized weld specimens.