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Estimation of stress intensity factors in tubular K-joints using direct and indirect methods

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Estimation of stress intensity factors in tubular K-joints using direct and indirect methods
นักวิจัย : Lie, Seng Tjhen , Li, T. , Shao, Y. B.
คำค้น : DRNTU::Engineering::Civil engineering::Structures and design
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Lie, S. T., Li, T., & Shao, Y. B. (2014). Estimation of stress intensity factors in tubular K-joints using direct and indirect methods. International journal of advanced steel construction, 8(1), 17-37. , http://hdl.handle.net/10220/24674 , http://www.ascjournal.com/index.php?option=com_content&view=article&id=110:vol8no1-2&catid=104&Itemid=552
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : International journal of advanced steel construction
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The stress intensity factors at the deepest point and at the crack ends of a surface crack in a tubular K-joint are calculated by direct and indirect methods. In the direct method, the surface crack is modelled explicitly. An automatic mesh generator is developed to produce a well-graded mesh around the crack region. This is achieved by using five types of elements. Thereafter, the stress intensity factors of a surface crack located anywhere along the weld toe at the joint intersection are calculated using the J-integral method. The computed values had been verified by experimental test results. In the indirect method, the stress intensity factors are estimated by the T-butt solutions used in conjunction with the stress concentration factors (SCFs) and degree of bending (DOB) of the uncracked tubular K-joint. In this study, a total of 1024 models, covering a wide range of geometrical parameters and crack shapes, have been selected and analyzed. Both approaches are able to produce a safe estimation of stress intensity factors at the deepest point of the surface crack. However, the indirect method is found to be extremely conservative; it overestimates the stress intensity factor values by as much as 190.4% (β=0.5, γ=30, τ=0.5, a/T=0.1, c/a=5) at the deepest point, and 390.7% (β=0.4, γ=30, τ=0.5, a/T=0.5, c/a=8) at the crack ends of the surface crack respectively

บรรณานุกรม :
Lie, Seng Tjhen , Li, T. , Shao, Y. B. . (2555). Estimation of stress intensity factors in tubular K-joints using direct and indirect methods.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lie, Seng Tjhen , Li, T. , Shao, Y. B. . 2555. "Estimation of stress intensity factors in tubular K-joints using direct and indirect methods".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lie, Seng Tjhen , Li, T. , Shao, Y. B. . "Estimation of stress intensity factors in tubular K-joints using direct and indirect methods."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Lie, Seng Tjhen , Li, T. , Shao, Y. B. . Estimation of stress intensity factors in tubular K-joints using direct and indirect methods. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.