• Engineering Design Analysis

  • Our Introduction

    AMCO Integrity Pty. Ltd is an independent company registered in Australia. It is a highly innovative engineering and consulting company engaged in state of the art R&D and product development in the energy sector, including renewable and small scale energies, and in high temperature plant issues in general…

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  • EDSE Technology

    The Electric Discharge Sampling Equipment (EDSE) was developed by our UK based partner in collaboration with international partners to aid in the condition and life assessment of components. The sampling of in-service components has long been seen as an effective way of determining actual material properties and sub-surface material

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  • Portable SFM Technology

    The Portable Scanning Force Microscope (Integrity-Scanning Force Microscope) has been developed for early stage damage detection such as creep cavitation (especially in P91 & P92 steels) which will not be found using traditional replication techniques.…

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  • Obikou

    Obikou is an on-site service for power, process and other high temperature plant and has shown to achieve creep life extension by a factor of about 4. It simply involves quickly reinforcing a potentially vulnerable or creep damaged pipe with multiple layers of thin high-temperature alloys strip that is wound/wrapped around a pipe thus halting/ reducing the development of creep damage….

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  • Research & Development

    AMCO has excellent expertise through its in-house R&D, plant service/technical
    consulting and project management experience and links with plant manufacturers,
    plant operators, service providers and researchers from around the world.

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AMCO Integrity Pty Ltd offers in-house finite element (FE) modelling of plant components. FE modelling can help in a number of circumstances – at the design phase, when looking for stress concentrations and deciding the placement of welds; in remaining life assessment, when evaluating the effect of thinning on stress distribution; in maintenance planning, when locating areas for inspection etc. Our engineers have experience modelling complex components and interpreting the results to provide you with the best recommendations.

These tools can be applied to a wide variety of components and systems, including:

  • Headers and Drums
  • Welds/DMWs
  • Nozzles
  • Valves
  • Piping
  • Turbine Rotors/Disks
  • Boiler Tube Assemblies
  • Pressure Vessels
  • Steam Chests
  • Structural Components
  • Fasteners/Bolts
  • Fittings

Critical components and systems can exhibit problems or issues at any time during their service lives. New systems can break down prematurely or fail to function as designed, older systems can incur long-term wear or damage or fail as a result of other unidentified causes, or changes to the design or operation of a system can result in a need to understand how the current condition of the component or system will affect performance.

Why Finite Element Modelling?

Finite element analysis (FEA) is a computer-based technique which can be used to analyze mechanical components or parts. FEA is also a popular numerical methodology that is widely used to solve engineering problems. Major applications for FEA include static, dynamic and thermal characterizations of mechanical components or parts.

The use of FEA in modelling the viscoelastic properties such as incompressibility, large strains and non-linearity. Even with the complex theory, shortcomings and difficulties, non-linear FEA is becoming more popular as a standard analysis tool for stress analysis, failure analysis, fluid mechanics, heat transfer etc.

Geometric discontinuities cause a large variation of stress locally and often produce a significant increase in stress. The high stress due to geometric discontinuity is called a ‘Stress Concentration’. This can also appear when loads are applied over a small area or at a point. Geometric discontinuities are often called as ‘Stress Risers’. Examples of stress risers include holes, notches, fillets and threads in a structural member.

Often, Stress Risers are at the starting point of material damage. This ultimately leads to material failure by fracture. For this reason, it is important to realize the existence of stress concentrations and understand the overall behavior of some typical geometrical configurations for critical applications. The ratio of the average or nominal stress to maximum stress is called Stress Concentration Factor and is denoted by K. These Stress Concentration Factors are significant in any mechanical component, as they gives rise to localized stress when any change in the design or surface, or abrupt change in the cross section, occurs. Almost all machine components and structural members contain some form of geometrical or micro-structural discontinuities. These discontinuities are very dangerous and lead to failure. So it is very much essential to analyze the stress concentration factors for critical applications like Turbine Rotors, Tee Joints, valves etc.