首页> 外文会议>ASME pressure vessels and piping conference;PVP2009 >PROGRESS IN THE ANALYSIS OF DUPLEX CT SPECIMEN TEST RESULTS USING FE ANALYSIS TO ASSESS THE CRACK BEHAVIOUR IN HETEROGENEOUS MATERIALS
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PROGRESS IN THE ANALYSIS OF DUPLEX CT SPECIMEN TEST RESULTS USING FE ANALYSIS TO ASSESS THE CRACK BEHAVIOUR IN HETEROGENEOUS MATERIALS

机译:有限元分析评估异质材料双相CT试件结果的研究进展

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Currently, structural integrity safety cases are based on avoidance of fracture initiation, providing a pessimistic estimate of structure life. However, crack behaviour at heterogeneous junctions is an area where understanding is particularly limited. Improved data regarding the behaviour of defects at such junctions after initiation may lead to improved assessment of real structures containing welded joints. Furthermore, justification of stable tearing at a material interface would result in increased demonstrable safety and higher plant availability.An experimental study has been carried out to investigate the ductile fracture behaviour of a crack approaching material interfaces. The aim has been to examine and refine current guidelines in the R6 defect assessment procedure. The experiments have been supported by 3D finite element modelling of the specimens and by R6 calculations. A further assessment of the standard (25mm) CT specimen results indicated that the R6 guidance on usage of the toughness in the crack tip medium may not always be conservative. However, the assessment points are conservative when the lowest yield strength or the weighted average yield strength values are used in the R6 fracture assessment.
机译:当前,结构完整性安全案例是基于避免断裂的发生,对结构寿命提供了悲观的估计。但是,异质结处的裂纹行为是一个特别受限制的领域。有关引发后此类接合处的缺陷行为的改进数据可能会导致对包含焊接接头的真实结构的评估得到改善。此外,在材料界面处稳定撕裂的合理性将导致增加的可证明的安全性和更高的工厂利用率。 已经进行了实验研究以研究接近材料界面的裂纹的延性断裂行为。目的是检查和完善R6缺陷评估程序中的当前准则。实验得到了标本的3D有限元建模和R6计算的支持。对标准(25mm)CT样品结果的进一步评估表明,R6指南在裂纹尖端介质中使用韧性可能并不总是保守的。但是,在R6断裂评估中使用最低屈服强度或加权平均屈服强度值时,评估点较为保守。

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