针对基于应变设计的 X70管线钢管,采用单边缺口拉伸试验对该钢钢管环焊缝金属及热影响区的裂纹尖端张开位移进行研究,获得了裂纹延性扩展过程的断裂阻力曲线,并对热影响区试样的试验结果进行了有效性验证.结果表明：热影响区试样的裂纹尖端距熔合线的距离在0．5 mm以内,焊缝金属和热影响区试样的断裂阻力曲线分别为δ＝1．39578(Δa )0．78335,δ＝1．55338(Δa )0．82175；采用单边缺口拉伸试验能准确测出管线钢环焊接头在低约束条件下的断裂韧性；试验结果可以为管线基于应变设计和工程临界评价提供依据.
The single-edge-notched-tensile (SENT)test was carried out on strain-based design of X70 steel pipeline to measure crack tip opening displacement of girth weld metal and heat affected zone.The fracture resistance curves during crack ductile extension process were obtained and tested results of heat affected zone sample were validated.The results show that the distance from crack tip of heat affected zone sample to fusion line was within 0.5 mm.Fracture resistance curves of weld metal and heat affected zone samples as followed:δ =1.395 78(Δa )0.783 3 5 ,δ= 1.553 38 (Δa )0.82 1 7 5 .Fracture toughness of pipeline girth weld under low constraint condition can be accurately measured by SENT test.The tested results can provide evidence for strain-based design pipeline and engineering critical assessment.
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