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The determination of the stress intensity factor solutions for the new pipe-ring specimen using FEA

机译：用有限元分析法确定新的管环试样的应力强度因子解

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For safe transport and reliable supply of petrochemical substances, it is crucial to ensure the structural integrity of the equipment, pipelines in particular. Regarding the large diameters and high mass per distance, pipelines for natural gas are designed as thin-walled cylindrical structures. To ensure the structural integrity of the unknown material means to measure and therefore empirically test the material fracture properties of the laboratory specimen for giving an assessment of the accepted defect size. Compared to standards and regulations, such as the ASTM E-1820, BS 7448 standards and the GKSS procedure, the production of standard specimens for measuring the fracture toughness is commonly very difficult or even impossible for applications. On the basis of the Slovenian-Russian bilateral project, we investigate and propose a solution for this issue with a new kind of specimen, called the pipe-ring specimen. The specimens were made from a segment of the observed thin-walled pipeline from the construction filed or stored in a warehouse. The measurement procedure is similar as for the standard SENB specimens and extensometer because of the geometry of the specimen, which is cut from the pipe and contains only a machine-made notch. The next step is to test specimens axially on the three-point bending load test on the hydraulic machine. Because the ring as the specimen is not standardized, it is necessary to show and prove how, and if it is possible to use ring specimens as an alternative option to the standard specimens for testing and determining fracture properties of testing material for thin-walled pipelines. In the frame of the three main experimental, analytical and numerical approaches, this publication shows the numerical approach of defining the stress intensity factor (SIF) for crack opening mode I with and without prior fatigue pre-cracking. Besides the limit load, the SIF presents one of two main parameters for developing the failure assessment diagram and estimating the possible accepted defects in a material relating to its' structural integrity.
机译：为了安全运输和可靠供应石化物质，至关重要的是确保设备（尤其是管道）的结构完整性。关于大直径和高单位距离质量，天然气管道被设计为薄壁圆柱结构。确保未知材料的结构完整性意味着要测量并因此凭经验测试实验室样本的材料断裂性能，以评估可接受的缺陷尺寸。与标准和法规（例如ASTM E-1820，BS 7448标准和GKSS程序）相比，用于测量断裂韧性的标准样品的生产通常非常困难，甚至无法应用。在斯洛文尼亚-俄罗斯双边项目的基础上，我们研究并提出了一种新的标本，称为管环标本，为该问题提供了解决方案。样品是从观察到的薄壁管道的一部分制成的，该管道是从归档或存储在仓库中的构造中提取的。测量过程与标准SENB标本和引伸计相似，这是因为标本的几何形状是从管道上切下来的，只包含一个机加工的缺口。下一步是在液压机的三点弯曲载荷测试中轴向测试样本。由于作为标本的环没有标准化，因此有必要展示和证明如何以及是否可以使用环标作为标准标本的替代选项来测试和确定薄壁管道的测试材料的断裂性能。在三种主要的实验，分析和数值方法的框架内，该出版物显示了定义有无疲劳预裂纹的开裂模式I的应力强度因子（SIF）的数值方法。除了极限载荷外，SIF还提供了两个主要参数之一，用于制定失效评估图并估计与材料的结构完整性有关的材料中可能存在的缺陷。

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