Toothbrush
Lattice and Topology Optimization for Additive Manufacturing Fall 2018
Initial Design
A simple toothbrush CAD design was modeled in Onshape.
Different views of the model show off the different features
Lattice Optimization
The settings used in the optimization:
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Type: Lattice
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Objective: Maximum Stiffness
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Mass Targets: 50% total design space reduction
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Target Length: 7.5mm
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Minimum Diameter: 2mm
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Maximum Diameter: 3mm
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Fill with: 100% Lattice
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Frequency constraints: None
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Speed/Accuracy: Faster
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Contacts: Sliding Only
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Gravity: No
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Safety Factor of 1.2
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Blended Contours
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Smooth Lattice
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Material: Plastic (ABS)
Altair Inspire was used to lattice the handle.
Three different analyses shown: Tension/Compression, Displacement, and von Mises Stress
The initial and final positions are shown by the grey outline.
The Load Case is shown with the red arrows:
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Pressure at top section of 0.015MPa
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Pressure at middle section of 0.015MPa
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Support on lowest section
Topology Optimization
Generative design was used for this iteration.
-A design space was created in Onshape that retained the toothbrush bristles and general round handle with a flat bottom.
-The space was cut and partitioned in Altair Inspire to account for the pressure of each finger on the handle and the pressure from the teeth during brushing.
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.015MPa on the toothbrush head
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.015MPa from the index finger
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.005MPa from the thumb
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.001MPa from the middle finger
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.001MPa from the ring finger
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.003MPa from the pinky finger
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Support on the flat bottom
-A topology optimization was run on the design space and the new geometry was formed.
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Objective: Maximum stiffness
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Material: Plastic (ABS)
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Mass Targets: 30% total design space reduction
-The Polynurb tool was used to create a smooth geometry before printing.
Altair Inspire was used to topologically optimize the design space producing an organic, hollow, truss-like structure.
Combined Lattice and Topological Optimization
