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Numerical Study of Concrete Dynamic Splitting Based on 3D Realistic Aggregate Mesoscopic Model
Qi Yu1,2, Zhanyang Chen1, Jun Yang1
1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Materials (Basel, Switzerland)
|April 30, 2021
Summary
This study models concrete's mesoscopic structure to analyze its dynamic tensile strength. Mortar's tensile strength most impacts concrete's dynamic performance, while aggregate strength has minimal effect.
Area of Science:
- Materials Science
- Civil Engineering
- Computational Mechanics
Background:
- Concrete is a three-phase material (mortar, aggregate, ITZ) at the mesoscopic scale.
- Understanding mesoscopic structure's effect on mechanical behavior is crucial for concrete.
Purpose of the Study:
- To establish a concrete mesoscopic structure model.
- To investigate the effects of phase component tensile strengths on dynamic tensile strength and energy absorption.
Main Methods:
- Reconstructed aggregate geometric models using fractal Brownian motion.
- Established concrete mesoscopic structure model with random aggregate distribution.
- Generated numerical models using grid mapping technology.
- Validated model with Split Hopkinson Pressure Bar (SHPB) dynamic compression experiments.
Main Results:
- Dynamic failure initiates at the Interfacial Transition Zone (ITZ), propagates to mortar, with aggregates rarely failing.
- Increased strain rates intensify failure propagation and can cause aggregate element deletion.
- Mortar tensile strength has the most significant impact on concrete's dynamic tensile strength and energy, followed by ITZ strength; aggregate strength has negligible effect.
Conclusions:
- The developed mesoscopic model accurately represents concrete's dynamic behavior.
- Material properties of mortar and ITZ are critical for enhancing concrete's dynamic tensile performance.
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