Mesh Sensitivity Analysis of Allowable Load via FEA of Plastic Collapse based on API 579 and ASME

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Abaqus General Skills for FFS ,Structure Integrity and Assessment based on API, BS, ASME and DNV:    • Abaqus General Skills for FFS ,Structure I...  
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Due to hardware limitations, we cannot use fine mesh in the stress-concentration regions of complex equipment most of the time. The other limitation is the simulation time. Increasing the number of elements increases simulation time. Hence, most of the time we must use a moderate mesh for complex structures, and it is important to achieve acceptable results without resorting to heavy models.

This tutorial investigates the sensitivity of the allowable load to element size and type, particularly in stress-concentration regions, such as corroded areas. The allowable load is calculated from the Plastic Collapse simulation using nonlinear FEA, in accordance with API 579 Annex 2D and ASME Section 8 Division 2 Part 5.

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Useful for the users of other FE software.

Table of Content:

How much does the allowable load depend on the element size and element type?

How to choose the regions and edges with fixed or variable element size during the mesh sensitivity analysis to reduce simulation cost based on the created partitions

How to do mesh sensitivity analysis without too much increase in the simulation duration

How to choose the size of the second-order elements

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#corrosion
#defect
#simulation
#simulia
#ffs
#api579
#api
#ASME