AFAA have considerable experience in the field of finite element analysis (FEA) using ABAQUS and ANSYS software. We are frequently involved with determining the acceptability of piping components that have exceeded piping stress code allowable stress limits by creating accurate 3-dimensional geometries using CAD and analysing them using FEA.
Finite Element Analysis (FEA)
In a non-linear analysis the structure's stiffness changes as it deforms. Whilst in reality all structural problems are non-linear, considering them as linear is a convenient way of approximating the solution. However there are instances where a linear analysis yields non-favourable results or material non-linearity must be considered.
Elastic-Plastic Analysis (Non-linear)
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A static stress analysis assumes the relationship between the applied load and its structural response remains in the elastic region of the stress-strain curve.
AFAA have extensive experience in performing assessments to the requirements of codes such as ASME VIII Division 2 and PD 5500.
Elastic Analysis (Linear)
Whilst a static analysis is sufficient for long term response of a structure, a dynamic (explicit) analysis is required for considering short term duration and response.
AFAA have used explicit dynamic analysis for developing a model to predict instantaneous failure of a pipeline due to third party interference. AFAA have experience in modelling the impact on the pipeline to simulate the damage (dent and gouge) profile and to establish the strain and stress fields from the resulting analysis to determine the acceptability of the damage.