Determination and Validation of Parameters for Riedel-Hiermaier-Thoma Concrete Model

Abstract

Numerical modelling of the complex physical processes such as concrete structures subjected to highimpulsive loads relies on suitable material models appropriate for impact and explosion problems. One of the extensive used concrete material models, the RHT model, contains all essential features of concrete materials subjected to high dynamic loading. However, the application of the RHT model requires a set of material properties and model parameters without which reliable results cannot be expected. The present paper provides a detailed valuation of the RHT model and proposes a method of determining the model parameters for C40 concrete. Furthermore, the dynamic compressive and tensile strength function of the model formulation are modified to enhance the performance of the model as implemented in the hydrocode AUTODYN. The performance of the determined parameters of the modified RHT model is demonstrated by comparing to available experimental data, and further verified via simulations of physical experiments of concrete penetration by steel projectiles. The results of numerical analyses are found closely match the penetration depth and the crater size in the front surface of the concrete targets.

Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions

“…When T2=0, B0, B1, A1, A2 and A3 is derived From the Rankine-Hugoniot and Mie-Gruneisen equation of state [21].…”

“…The Moore-Coulomb damage theory is widely used in the field of geotechnical engineering. This paper is based on the Moore-Cullen damage criterion, whose shear strength 𝜏 is equal to the sum of the friction generated by the rock cohesion c and the corresponding normal stress 𝜎 on the shear plane, as shown in expression (21). At the limit equilibrium state Figure 7-1* of the maximum principal stress, the minimum principal stress is back-calculated using the maximum principal stress, when the calculated minimum principal stress is less than the minimum principal stress at the limit equilibrium state (as shown in Figure 7-2* of the stress state).…”

Combined effects of penetration and explosion on damage characteristics of a mass concrete target

“…Based on the HJC model, Riedel et al [32] developed RHT model. The constitutive model can describe the characteristics of the concrete material behavior at a high strain rate, and has been widely employed by researchers to simulate the dynamic response of concrete-like materials under impact or blast loading [18,25,33,34]. The main parameters for the concrete RHT model are shown in Table 1.…”

Failure and Ejection Behavior of Concrete Materials under Internal Blast

“…In the final solidification phase, the material is approximately homogeneous, and the volumetric response is once again elastic. RHT concrete model is widely used by many researchers to model the dynamic response of concrete subjected to internal blast [14][15][16]. Three shear strength surfaces are employed in this concrete model: elastic limit surface, failure surface, and residual surface.…”