Computer Simulation of Polyethylene Terephthalate Carbonated Beverage Bottle Bottom Structure Based on...

Area of Science:

• Materials Science
• Mechanical Engineering
• Packaging Technology

Background:

• PET bottles are common for carbonated drinks, requiring high pressure resistance.
• Internal CO2 pressure can lead to bottle cracking and liquid overflow if the structure fails.
• Optimizing bottle bottom design is crucial for structural integrity.

Purpose of the Study:

• To investigate the structural optimization of PET bottle bottoms for enhanced pressure resistance.
• To reduce stress, strain energy, and deformation under internal pressure.
• To prevent material failure like local cracking and liquid overflow.

Main Methods:

• Employed a hybrid optimization approach: manual adjustment followed by automatic optimization using Comsol software.
• Defined initial optimal parameters manually: inner diameter (17 mm), dip angle (81°), deepest part (25 mm), outer diameter (27 mm).
• Simulated and analyzed stress, strain energy, and displacement under pressure.

Main Results:

• Manual-automatic optimization reduced maximum principal stress by 69.4%.
• Total elastic strain energy decreased by 40.0%.
• Deformation-induced displacement was reduced by 74.1% (0.60 mm).

Conclusions:

• The combined manual and automatic optimization method significantly enhances PET bottle bottom structural performance.
• Optimized design effectively mitigates risks of cracking and overflow in carbonated beverage containers.
• This approach offers a substantial improvement in pressure-bearing capacity for PET bottles.