Impact Analysis of Concrete Structure Using Rate Dependent Damage Model

EasyChair Preprint 9001

Abstract

The concrete subjected to dynamic loading shows increased strength compared to the static strength of the material. The common way of using the dynamic increase factors depending on the assumed value of the strain rate is not an appropriate method of numerical analysis. Thus, there is a need to understand the dynamic increase in strength of the material using the physical mechanisms. The material effects like viscosity and the reduced micro-cracking evolution are seen in the material with an increased loading rate. The increase in strength is mainly caused by the greater resistance of water in the capillary system of concrete. The increase in strength should be limited by giving the ultimate strength of the material under dynamic loading. It is not possible for the material to increase in strength indefinably. The yield surface is defined considering the effect of lode angle. The yield surface increases its size with the increase in the strain rate of the material. Thus, the improved plasticity-based damage material model considering the pressure and the rate dependency is proposed. The damage and evolution of damage are considered while defining the constitutive equation of the model. The model is validated with the experimental impact results available in the literature. It is observed that the proposed model is able to predict the material and mechanical behavior of the material accurately. The parametric study is carried out to understand the behavior of the structure under impact loading.

Keyphrases: Concrete, Rate dependent damage, impact mechanism, structural behavior

@booklet{EasyChair:9001,
  author    = {Akshaya K Gomathi and Rajagopal Amirtham},
  title     = {Impact Analysis of Concrete Structure Using Rate Dependent Damage Model},
  howpublished = {EasyChair Preprint 9001},
  year      = {EasyChair, 2022}}