Simplified strategies based on damage mechanics for concrete under dynamic loading

Area of Science:

• Civil Engineering
• Materials Science
• Computational Mechanics

Background:

• The µ damage model previously addressed concrete damage under monotonic and cyclic loading.
• Existing models simplify constitutive relationships, potentially limiting nonlinear effect accuracy.
• Unilateral effects in concrete damage require further modeling refinement.

Purpose of the Study:

• To present an enhanced simplified finite-element (FE) description of concrete damage.
• To incorporate strain rate effects into the damage model for dynamic loading scenarios.
• To validate the FE model's efficiency for simulating various velocities of dynamic loading.

Main Methods:

• Utilized multifibre beam elements for a simplified FE description.
• Integrated a damage description accounting for nonlinear effects.
• Included strain rate dependency in the constitutive relationships.

Main Results:

• The enhanced model accurately describes main nonlinear effects in concrete.
• The simulation strategy proved efficient for dynamic loading.
• The model successfully simulated low, medium, and high velocity impacts.

Conclusions:

• The enhanced simplified FE model with multifibre elements is an efficient tool for dynamic loading simulation.
• The model effectively captures concrete damage, including strain rate effects.
• This approach advances the modeling of brittle materials under high strain rates.