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首页> 外文会议>ASME Pressure Vessels and Piping Conference >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：使用微机械方法的裂纹管道的突发压力预测

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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：本研究扩展了基于计算单元方法的微机械方法，以在高强度管线钢中模拟纵向裂纹状缺陷的延展性裂纹延伸。使用标准的深裂缝C（t）样本在室温下对API 5L X60钢的实验室测试提供测量材料裂纹生长曲线所需的数据。在计算单元模型中，延展性裂纹延伸通过空隙生长和聚结（通过细胞消光）在裂纹尖端之前的薄材料层内发生。还描述了一种简单的方案，用于校准细胞的材料特定参数。本文的中心焦点是电池方法的应用预测具有不同裂纹尺寸的预破裂管样品的实验测量的突发压力。实验程序包括纵向预粘的20“（508毫米）OD管样品，其中15.8毫米厚度，内部裂缝，凹口深度（a）和凹口长度（2c）7x140 mm。进行大规模，全面的3-D计算具有增加的压力的管道标本的详细有限元模型。数值模拟证明了细胞方法描述裂纹增长反应的有效性，并预测测试管道的突发压力。

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