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Company:

SOLVAY Speciality Polymers

Products:

Digimat

Industries:

Consumer Products

Overview:
By using DIGIMAT the engineers at Solvay could clearly demonstrate the tight link between geometry, flow of material, fiber orientation and mechanical behavior. They successfully used the approach to evaluate the endurance of a number of different bow limb designs.
Challenge:
  • A manufacturer injection-molded plastic bows set the goal to produce the best bows for recreational archery on the market based on SOLVAY material
  • A new and apparently improved design of the bow limbs showed a reduced fatigue lifetime as compared to an existing geometry
  • The question arose whether the premature failure of the new design is directly connected to the change in the processing of the bow limbs
Solution:
  • Reverse engineering of an elasto-plastic DIGIMAT material model
  • Computation of 1st principles stresses for preload and load cases based on fiber orientation data coming from Moldflow
  • Life time prediction using a Haigh diagram
  • Comparison between the two different designs for the bow limbs
Results Validation:
"By using DIGIMAT we could clearly demonstrate the tight link between geometry, flow of material, fiber orientation and mechanical behavior. We successfully used the approach to evaluate the endurance of a number of different bow limb designs." Laurent Hazard, CAE Senior Specialist, SOLVAY
Benefits:
  • The lifetime in fatigue of the original design should be slightly longer than the new design
  • The higher stress level for the new design could be connected to a higher local stiffness in the critical region in the bow limb
  • The higher local stiffness could be explained by a “better” fiber orientation due to a change in the melt flow in the processing step (combination of two “converging” flows)

 
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