Dissertation > Industrial Technology > General industrial technology > Engineering and basic science > Engineering Mechanics > Engineering plastic mechanics,engineering elasticity

Carrying Capacity Finite Element Analysis of Piping Branch Junctions Based on Effect of Enhanced Plasticity

Author ZhuPeiCheng
Tutor DongXinLong
School Ningbo University
Course Engineering Mechanics
Keywords Tee Hardening plasticity Plastic Limit Analysis FEM
Type Master's thesis
Year 2010
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Tee structure is a petrochemical industrial pipeline nuclear power is an important component elements , is confined device common structural patterns . In recent years, the structure for the three-way plastic limit analysis carried out a lot of research, but in the theoretical analysis and numerical simulations typically have adopted the basic ideal plastic constitutive model , taking into account the structure of the plastic tee strengthening effect of the plastic strength research work has not yet commenced , not fully tapped the potential use of the material tube . This paper considers material during use due to the large plastic deformation strengthening effect , analyzing the structure of non-defective tee plastic limit load , using commercial finite element software ANSYS detailed numerical simulations , based on the maximum strain intensity nodes , extract different charge carriers step under the strain intensity , and make the appropriate strain intensity node load - strain intensity curve . From an engineering point of view , the use of analysis and design standards and ASME specifications recommended twice elastic slope criterion to determine the plastic limit load value . Discuss strengthening effect on tee structural plasticity plastic limit load and failure modes were investigated , the main research contents and conclusions are as follows: 1 , the establishment of orthogonal Equal Tee , different diameters equal thickness than the quadrature tees, different tube orthogonal diameter ratio equal strength tee , Equal bias tee perfectly plastic and plastic enhanced three-dimensional finite element model, and the inner pressure reaches its yield limit of the process, tracing its loading history , studied different load steps under Mises stress distribution . 2 , the establishment of local thinning orthogonal Equal Tee , bias tee thinning ideal plasticity , strength plastic limit pressure databases , analyzes its thinnest thickness of the thinned region , circumferential length , the length of the axis limits impact loads . Through comparative analysis, considering plastic reinforced plastic tee than it was in perfect tee under pressure plastic limit load has increased significantly . This is to improve material utilization , improved structural design and safety assessment tee provides a theoretical basis and numerical reference.

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