109 Use Of Fem In Composites Presentation 1

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109 Use Of Fem In Composites Presentation 1

  1. 1. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Brief Description of the Finite Element Method (FEM) ♦ The use of FEM at the concept design stage ♦ Detailed design using FEM ♦ Laminate Optimization - Cost reduction and reverse engineering ♦ Failure Analysis using FEM ♦ Design Verification - Client review of design and 3rd party inspection
  2. 2. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Comparison between theory and FEM predictions for the longitudinal stress resultant in a GRP road tanker subjected to uniform internal pressure
  3. 3. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Comparison between theory and FEM predictions for the circumferential stress resultant in a GRP road tanker subjected to uniform internal pressure
  4. 4. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM model of the one half of the helicopter composite axle, with different materials assigned to each band
  5. 5. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM plot showing the stress in the outer longitudinal layer as a result of the crash load case
  6. 6. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES HELICOPTER COMPOSITE AXLE LOADCASE CRASH 9 20 18 16 TOTAL THICKNESS (NOMEX+CARBON) 14 12 10 8 6 4 2 0 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 SPANWISE STATION (-Y) TOTAL THICK CARBON THICK NOMEX THICK ♦ Variation of thickness along the length of the helicopter composite axle (centreline on the left)
  7. 7. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES HELICOPTER COMPOSITE AXLE LOADCASE CRASH 9 140 120 100 NO OF LAYERS 80 60 40 20 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 MATERIAL TYPE (1=TIP) 0 +45 +90 -45 ♦ Variation of the laminate construction along the length of a helicopter composite axle (centreline on the right)
  8. 8. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Analysis of a carbon archery bow using FEM from the concept stage
  9. 9. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM buckling analysis of a hollow carbon fibre windsurfer board used to determine initial laminate details
  10. 10. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ 3D rendered model of a 23m3 GRP underground storage tank (UST)
  11. 11. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ 3D rendered model showing a section through the wall of the GRP underground storage tank
  12. 12. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ A section through the GRP UST which is exported from the 3D CAD package and imported to the FEM program for mesh generation. The rib stiffener and overlay laminate are clearly visible
  13. 13. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Stresses in the corrosion barrier for a section of the GRP UST supported by a cross brace and GRP ring stiffener
  14. 14. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Stresses in the corrosion barrier for a section of the GRP UST supported by a GRP ring stiffener
  15. 15. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Stresses in the corrosion barrier for a section of the GRP UST supported by a Steel ring stiffener overlaid with GRP
  16. 16. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Stresses in the corrosion barrier for a section of the GRP UST consisting of a GRP shell section only (no ribs stiffeners or cross
  17. 17. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Detailed design using FEM for a carbon fibre business class seatback
  18. 18. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Detailed design of a carbon fibre wing for a supersonic aircraft at ultimate load using FEM
  19. 19. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM analysis to predict the natural frequency of the first mode of vibration. This was determined to be at 46 Hz
  20. 20. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM of a section of the conical bottom of a silo as calculated by BS 4994
  21. 21. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM of a section of the conical bottom of a silo after optimisation
  22. 22. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ FEM of a section of the conical bottom of a silo with proposed circumferential and radial stiffeners
  23. 23. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Detailed design using FEM for a glass reinforced sandwich satellite TV antenna
  24. 24. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Top dome of an ice scraper vessel designed to BS 4994 optimised by FEM to carry the torsion loads
  25. 25. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Shell of an ice scraper vessel designed to BS 4994 optimised by FEM to carry the torsion loads
  26. 26. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ 3D rendering of the yacht which was analysed
  27. 27. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ 3D solid model of the keel, keel support, keel bolts and hull
  28. 28. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ The effect that the specified grounding load has on the fibres along the axis of the keel
  29. 29. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ The effect that the specified grounding load has on the keel support structure
  30. 30. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Buckling design verification of a silo designed for 250mm vacuum, 150 km/hr wind, full contents and a 8 ton vertical top load
  31. 31. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Design verification of a modification to a torpedo hull subjected to external pressure (buckling analysis)
  32. 32. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Model of an economy class carbon fibre seatback used to determine the regions responsible for seat structural failure
  33. 33. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Model of the corner of a flat bottomed pressure vessel. Each layer of material was given it’s axisymmetrical orthotropic properties
  34. 34. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES ♦ Axisymmtrical FEM model of a section through a glass wrapped PVC pipe with a steel coupling. The steps in the pipe are there to transfer the axial load from the steel component to the composite
  35. 35. APPLICATIONS USING FINITE ELEMENT METHODS TO REDUCE THE COST OF COMPOSITE STRUCTURES CONCLUSION ♦ Finite Element Methods are a powerful tool ♦ Enable today’s engineers to successfully design, build and analyse composite structures ♦ Accurately predict the load distribution in the structure ♦ Determine the effect of stress concentrations ♦ Compensate by adding extra reinforcing material in high stress regions ♦ Can result in the design of highly optimised structures ♦ Prove compliance with the customer requirements ♦ Ensure products do not weigh or cost more than necessary

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