Modeling strain rate effect on tensile strength of concrete using damage plasticity model


Ayhan B., Lale E.

International Journal Of Impact Engineering, vol.162, 2022 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Volume: 162
  • Publication Date: 2022
  • Doi Number: 10.1016/j.ijimpeng.2021.104132
  • Journal Name: International Journal Of Impact Engineering
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, L'Année philologique, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts

Abstract

Experimental researches show that the strength of material increases with strain rate. However, dynamic response of quasi-brittle materials is significantly different under tensile and compressive loading. In order to simulate this phenomenon, damage plasticity model is adopted and enhanced with strain rate effect. Two different state variables as equivalent strain rates are defined, one for compression and other one for tension. Corrected strain rates are used instead of instantaneous ones, in order to consider retardation of damage evolution. Simulations of Split Hopkinson pressure bar (SHPB) are conducted to investigate dynamic tensile strength of concrete specimens. Performance of the proposed model is demonstrated by comparing with experimental results. Furthermore, a parametric study is conducted and effects of different parameters, such as dilatation angle, friction, thickness of the specimen, shape of impulse and impedance mismatch, on the dynamic increase factor are discussed in detail.