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With incomplete penetration defects discontinuous pressure pipeline safety analysis

Author: WanXianPing
Tutor: JinZhiJiang
School: Zhejiang University
Course: Chemical Process Equipment
Keywords: Discontinuous incomplete penetration defects Pressure pipeline Plastic failure load Flow stress Interference effects Proper full assessment Study
CLC: TG441.7
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 1
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Abstract


Industrial pressure pipelines are basically using field manual arc welding , often in the welded joint between the weld metal and base metal occurrences are not leaving voids caused by arc melting and discontinuous incomplete penetration defects , to bring great pipeline operation dangerous , so the lack of penetration with discontinuous pressure pipeline safety assessment defect analysis is important. This paper mainly deals with incomplete penetration defects in industrial plastic pressure pipe failure load finite element calculation , calculation of flow stress , lack of penetration discontinuity defect engineering methods and simplified interference effects , as well as the establishment of final safety assessment curve such key technologies research and experimental verification , the main research results obtained are as follows: ( a ) a pipe plastic failure load of analytical focus , according to the basic theory of finite element to determine the nonlinear finite element software ANSYS calculation with incomplete penetration defects plastic pressure pipe failure load method and for subsequent calculation of large quantities lay a good foundation . ( 2 ) the material flow stress is calculated a comparative study , established suitable for containing incomplete penetration defects pressure piping material flow stress calculation , the value of the flow stress load to failure to establish a direct impact on the value of the level of precision . ( 3 ) to study interference effects of the defect , inspect discrete incomplete penetration defects at different pitch changes when the failure load and failure load with a single defect comparison, come to different combinations of defects in the case of discontinuous incomplete penetration defects contextual interference effect and made discontinuous lack of penetration defect engineering simplified approach. ( 4 ) Through the continuous lack of penetration with no defects pressure pipe failure load of the finite element calculations and interference effects research , and the resulting data is processed to obtain a discontinuous incomplete penetration defects pressure pipeline safety assessment curve , in order to establish security evaluation equation , can be used as engineering assessment of the reference. ( 5 ) In order to verify the accuracy of the finite element calculations , using the pilot testing of plastic pipe containing defects failure load and use experimental data obtained for the interference effect relational verify calculations and found good agreement between the two .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > General approach > Welding defects and quality inspection
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