A Universal Method for Acquiring the Constitutive Behaviors of API -5 L X90 Welds

Kong, Lingzhen; Shuai, Jian; Zhou, Xu; Chao, Yuh J.; Han, Ke

doi:10.1007/s11340-015-0088-z

Cited by 13 publications

(2 citation statements)

References 28 publications

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“…Domestic and foreign standards API Std 1104 and SY/T 4109 for pore defects in pipe welds primarily prescribe size control. However, in the case of long distance pipe development with a large diameter, thin wall and high pressure, use of high-grade pipe steel requires a higher standard of quality control for the pipe girth weld [ 19 ]. Xiong et al analyzed effects of defect size and matching factor of weld strength by two-dimensional finite element model for weld defects in high strength pipes [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on size tolerance of pore defect of girth weld pipe

Shuai

2018

PLoS ONE

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Welding quality control is an important parameter for safe operation of oil and gas pipes, especially for high-strength steel pipes. Size control of welding defect is a bottleneck problem for current pipe construction. As a key part of construction procedure for butt-welding of pipes, pore defects in girth weld is difficult to ignore. A three-dimensional non-linear finite element numerical model is established to study applicability of size control indices based on groove shape and softening phenomenon of material in heat-affected zone of practical pipe girth weld. Taking design criteria of pipe as the basis, basic tensile, extremely tensile and extremely compressive loading conditions are determined for pipe stress analysis, and failure criteria based on flow stress is employed to perform stress analysis for pipe girth weld with pore defect. Results show that pipe girth welding stresses of pores at various radial locations are similar. Whereas, stress for pores of different sharpness varied significantly. Besides, tolerance capability of API 5L X90 grade pipe to pore defect of girth weld is lower than that of API 5L X80 grade pipe, and size control index of 3 mm related to pore defect in current standards is applicable to API 5L X80 and X90 grade girth welded pipes with radially non-sharp pore defects.

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Section: Introductionmentioning

confidence: 99%

Investigation on size tolerance of pore defect of girth weld pipe

Shuai

2018

PLoS ONE

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“…With the development of computer technology and the improvement of camera lens resolution, methods utilizing DIC (Digital Image Correlation) technology to test the material true stress-true strain curve have been widely used [11][12][13][14][15]. Based on DIC technology, Poulain et al [16] proposed three methods to get a true stress-true strain curve: VSE (Video-based Surface Extensometry), VRE (Video-based Radial Extensometry), and local DIC.…”

Section: Introductionmentioning

confidence: 99%

A Simple and Efficient Method for Obtaining the Whole-Range Uniaxial Tensile Properties of Pipeline Steel

Kong

Zhou

et al. 2018

Metals

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To obtain the whole-range true stress-true strain curves of API X65, a method is proposed based on the equal proportion principle and digital images. The tensile elongation was obtained by tracing the gauge points on the specimen surface, and the true strain and true stress of API X65 were calculated according to the formulae. The obtained true stress-true strain curves were validated by a 3-D finite element model. The true stress-true strain curve was set as the input data, while the engineering stress-engineering strain curve was set as the output data. The output data of the finite element model was the same as that of the experiment test. The findings imply that the proposed method could acquire reliable, whole-range true stress-true stain curves. These curves, which depict the material behavior of pipeline steel from initial elongation to fracture, could provide basic data for pipeline defect tolerance limit analysis and fracture assessment. by the method, while I2, M2, and O2 were tested by the traditional strain gauge method. Two kinds of results were used for comparison and analysis. Metals 2018, 8, 555 3 of 12 and O1 were tested by the method, while I2, M2, and O2 were tested by the traditional strain gauge method. Two kinds of results were used for comparison and analysis.

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