MODSIM 3DXCONFERENCE Lightweight Engineering
I am pleased to invite you to hear my presentation 'Simulation is Child's Play Broken Toys Aren't' on the Global 3DEXPERIENCE Modeling & Simulation Virtual Conference, on November 17th.
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ABSTRACT
This is a case study of multiple knit line failures on the popular fidget spinner toy. This toy’s geometry has been reverse engineered to create suitable geometry for a variety of simulations and redesigns. From an injection molding standpoint, the three lobed design, with 4 holes allow for a deceptively difficult molding problem. Knit lines are inevitable but where should the gates be located and where will the knit likes be located? Injection molding simulation is used to investigate a variety of gate locations and the use of multiple gates. Once the molding technique has been selected what can be done to maximize the strength of the part without deviating too far from the iconic design? Finite element analysis is performed to simulate the stresses induced through press fitting of the bearings. The simulation was carried out by having the bearings in place using contact with removing overclosures. This method is more computationally efficient than pressing the bearing in which would include sliding contact. The bearing insertion causes hoop stresses in each lobe. These stresses put the knit lines in tension which causes part failure. We will assume that the locations and sizes of the bearings are fixed and the outside diameter for ergonomic reasons. This sets the allowable design space for the redesign. Topology optimization was then used to evolve the design to maximize strength and stiffness while minimizing weight and cost, creating a design suitable for 3DPrinting.
The replay of this presentation will be available after the event via this post and I will be happy to answer your questions here as well.
You can find all event presentations on the wiki page:
