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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference: Residual Stress, Fitness - for - Service and Manufacturing Processes; 20030720-20030724; Cleveland,OH; US >BURST PRESSURE PREDICTIONS OF CRACKED PIPELINES USING A MICROMECHANICS APPROACH
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BURST PRESSURE PREDICTIONS OF CRACKED PIPELINES USING A MICROMECHANICS APPROACH

机译：使用微力学方法预测破裂管道的爆破压力

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摘要

This study extends a micromechanics approach based upon the computational cell methodology to model ductile crack extension of longitudinal crack-like defects in a high strength pipeline steel. Laboratory testing of an API 5L X60 steel at room temperature using standard, deep crack C(T) specimens provide the data needed to measure the crack growth resistance curve for the material. In the computational cell model, ductile crack extension occurs through void growth and coalescence (by cell extinction) within a thin layer of material ahead of crack tip. A simple scheme to calibrate material-specific parameters for the cells is also described. A central focus of the paper is the application of the cell methodology to predict experimentally measured burst pressures for pre-cracked pipe specimens with different crack sizes. The experimental program includes longitudinally precracked 20" (508 mm) O.D. pipe specimens with 15.8 mm thickness containing an internal crack with notch depth (a) and notch length (2c) 7x140 mm. Large-scale, full 3-D computations are conducted on detailed finite element models for the pipe specimens to describe crack extension with increased pressure. The numerical simulations demonstrate the effectiveness of the cell approach to describe crack growth response and to predict the burst pressure for the tested pipes.
机译：这项研究扩展了基于计算单元方法的微力学方法，以对高强度管线钢中纵向裂纹状缺陷的延性裂纹扩展进行建模。使用标准的深裂纹C（T）样品在室温下对API 5L X60钢进行实验室测试，可提供测量该材料的抗裂纹扩展曲线所需的数据。在计算单元模型中，延性裂纹扩展是通过在裂纹尖端之前的薄薄材料层中的空隙增长和聚结（通过单元消失）而发生的。还描述了一种简单的方案，用于校准电池的材料特定参数。本文的中心重点是单元法在预测具有不同裂纹尺寸的预裂管样品的实验测量爆破压力方面的应用。实验程序包括纵向预裂20英寸（508毫米）外径的管道样品，其厚度为15.8毫米，其中包含内部裂纹，其缺口深度（a）和缺口长度（2c）为7x140毫米。在此基础上进行大规模的全尺寸3D计算详细的有限元模型用于描述试件在压力增加时裂纹扩展的数值模拟，数值模拟证明了采用单元法描述裂纹扩展响应并预测被试管的破裂压力的有效性。

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