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首页> 外文会议>Biennial International Pipeline Conference(IPC 2004) vol.3; 20041004-08; Calgary(CA) >EXPERIMENTAL STUDY OF THICKNESS AND FATIGUE PRECRACKING INFLUENCE ON THE CTOA TOUGHNESS VALUES OF HIGH GRADE GAS PIPELINE STEEL
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EXPERIMENTAL STUDY OF THICKNESS AND FATIGUE PRECRACKING INFLUENCE ON THE CTOA TOUGHNESS VALUES OF HIGH GRADE GAS PIPELINE STEEL

机译：厚度和疲劳预裂解对高等级天然气管道CTOA韧性的影响的实验研究

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摘要

Recent experimental and computational studies have revealed that the CTOA fracture criterion has the potential to assess steady state ductile rupture resistance during large amounts of crack growth. One of the major difficulties currently limiting the more extensive use of CTOA is its practical estimation either on a real structure or in a laboratory scale test. The authors have recently developed a novel test technique for direct measurement of CTOA. It is a single CTOA test (SCT) method using a modified double cantilever beam (DCB) specimen. Photographic and video techniques are used to register the progression of the crack tip in real time on the faces of the DCB. The CTOA profile is estimated from the uniform variations of the slope of a reference fine mesh scored on the surface of the specimen. Its value is representative of the material CTOA. So far the method has been successfully tested on gas pipeline steels of grade API X80 and X100 and 6000 series aluminium alloy. In all tests, it generated large amounts of highly consistent CTOA data, even from a single test specimen. This paper describes recent results from the CTOA testing of X100 steel specimens with different ligament thicknesses in the range of 8 to 12 mm, equivalent to 42 to 63% of the original pipe wall thickness. In total 18 sets of CTOA test data were obtained from opposite sides of fractured specimens. Analysis of these showed that the CTOA values were thickness independent in the examined range. An average CTOA value of 8.5° was found for X100 steel in the steady state crack propagation phase. The development of slant fracture associated with the steady CTOA region was completed after an average crack growth of 1.3-2.7 times the specimen ligament thickness. The fatigue precracking resulted in a 10-23% drop in the initiation load depending on the gauge thickness of the specimen and the initial crack length.
机译：最近的实验和计算研究表明，CTOA断裂准则有可能评估大量裂纹扩展过程中的稳态韧性断裂阻力。当前限制CTOA更广泛使用的主要困难之一是其在实际结构上或在实验室规模测试中的实际估计。作者最近开发了一种直接测量CTOA的新颖测试技术。它是使用改良的双悬臂梁（DCB）标本的单CTOA测试（SCT）方法。摄影和视频技术用于实时记录DCB面上裂纹尖端的进展。根据样品表面上刻划的参考细网的斜率的均匀变化来估算CTOA轮廓。其值代表材料CTOA。到目前为止，该方法已在API X80和X100级以及6000系列铝合金的燃气管道钢上成功进行了测试。在所有测试中，即使从单个测试样本中，它也生成了大量高度一致的CTOA数据。本文介绍了X100钢试样的CTOA测试的最新结果，这些试样的韧带厚度在8至12 mm之间，相当于原始管壁厚度的42％至63％。从破裂样品的相对侧获得了总共18组CTOA测试数据。这些分析表明，CTOA值在检查范围内与厚度无关。 X100钢在稳态裂纹扩展阶段的平均CTOA值为8.5°。在平均裂纹扩展为样品韧带厚度的1.3-2.7倍后，与稳定CTOA区域相关的倾斜断裂的发展就完成了。疲劳预裂纹导致初始载荷下降10-23％，具体取决于试样的标称厚度和初始裂纹长度。

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