The Numerical Analysis and Experimental Study of the Stress Intensity Factor and Outer Surface Strain of the Pressure Pipe with Internal Longitudinal-Cracks

Abstract:

The strain characteristics in the outer surface of the pipe and the stress intensity factor in crack front with internal longitudinal-cracks were analyzed by the finite element method. According to the results of analysis, the outer surface strain variation to crack size was got and the relationship of stress intensity factor and crack size was known. Based on resistance strain gauges and fiber optic sensing technology, pressure pipe crack extension monitoring device was designed and the outer surface circumferential strain were tested .The results of finite element analysis and experiment are in good agreement. The outer surface strain variation in this paper can be used to analyze the situation of internal longitudinal-cracks extension.That relationship of stress intensity factor and crack size has an important reference to the safety assessment of pipe with internal longitudinal-crack.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 221-225
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.221
• Online since: September 2016
• Authors: Jia Sheng He*, Meng Qi Yan, Xiao Ming Zhu
• Keywords: Fiber Grating Sensor, Internal Longitudinal-Crack, Strain Variation, Stress Intensity Factor

References

[1] H.P. Marchenko, Influence of residual stresses on the stress intensity factors for a surface crack in the rail head, Materials Science, 2010, 46: 1-6.

DOI: 10.1007/s11003-010-9264-6

[2] Liu, Yue Ming, Cai, Qing Mu, Lou, Jun . Research on FBG high temperature sensor used for strain monitoring. Applied Mechanics and Materials, 2013, 341: 851-855.

DOI: 10.4028/www.scientific.net/amm.341-342.851

[3] Zhong, Z.P. Wan, S. Jiang, Z.W. Numerical analysis of crack propagation path using an advanced element cracking method. Strength of Materials, 2014, 46: 2-9.

DOI: 10.1007/s11223-014-9542-x

[4] Hall, Kurt J. Potirniche, Gabriel P. A three-dimensional edge-crack finite element for fracture mechanics applications. International Journal of Solids and Structures, 2012, 49: 2-10.

DOI: 10.1016/j.ijsolstr.2011.10.010

[5] Ma, Bina, Shuai, JianaLiu, DexubXu, Kuia. Assessment on failure pressure of high strength pipeline with corrosion defects. Engineering Failure Analysis, 2012, 32: 11-22.

DOI: 10.1016/j.engfailanal.2013.03.015