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On the Compressive Response of Polymeric Cellular Materials.
Stefano Del Rosso1, Lorenzo Iannucci1
1Department of Aeronautics, Imperial College London, London SW7 2AZ, UK.
Materials (Basel, Switzerland)
|January 23, 2020
Summary
This study tested lightweight cellular materials for energy absorption. Dynamic loading significantly enhances compressive strength by up to 87%, with 3D printed polymers showing superior strength and foams offering better energy absorption efficiency.
Area of Science:
- Materials Science
- Mechanical Engineering
- Polymer Science
Background:
- Lightweight cellular materials are crucial for energy absorption applications.
- Understanding material behavior under varying strain rates is essential for performance optimization.
Purpose of the Study:
- To investigate the compressive properties of high-performance lightweight cellular materials.
- To determine the influence of strain rates, precursor type, density, and infill topology on mechanical behavior.
Main Methods:
- Compression tests were conducted using a universal testing machine and a single-stage gas gun across a range of strain rates.
- Finite element (FE) method was employed for material parameter identification to determine dynamic strength.
Main Results:
- Mechanical properties demonstrated a clear dependence on polymeric precursor, density, infill topology, and strain rates.
- A substantial enhancement in compressive strength, up to 87%, was observed from quasi-static to dynamic loading.
- 3D printed polymers exhibited superior strength compared to polymeric foams.
- Polymeric foams displayed higher energy absorption efficiency and capacity.
Conclusions:
- Dynamic loading significantly boosts the compressive strength of lightweight cellular materials.
- Material selection involves a trade-off between strength (3D printed polymers) and energy absorption efficiency (polymeric foams).
- FE analysis accurately predicts material behavior under dynamic conditions, aiding in material design for specific applications.
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