Strain rate effects for spallation of concrete
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ID: 105194
2015
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Abstract
Appropriate triaxial constitutive laws are the key for a realistic simulation of high speed dynamics of concrete. The strain rate effect is still an open issue within this context. In particular the question whether it is a material property – which can be covered by rate dependent stress strain relations – or mainly an effect of inertia is still under discussion. Experimental and theoretical investigations of spallation of concrete specimen in a Hopkinson Bar setup may bring some evidence into this question. For this purpose the paper describes the VERD model, a newly developed constitutive law for concrete based on a damage approach with included strain rate effects [1]. In contrast to other approaches the dynamic strength increase is not directly coupled to strain rate values but related to physical mechanisms like the retarded movement of water in capillary systems and delayed microcracking. The constitutive law is fully triaxial and implemented into explicit finite element codes for the investigation of a wide range of concrete structures exposed to impact and explosions. The current setup models spallation experiments with concrete specimen [2]. The results of such experiments are mainly related to the dynamic tensile strength and the crack energy of concrete which may be derived from, e.g., the velocity of spalled concrete fragments. The experimental results are compared to the VERD model and two further constitutive laws implemented in LS-Dyna. The results indicate that both viscosity and retarded damage are required for a realistic description of the material behaviour of concrete exposed to high strain effects [3].
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| Reference Key |
ulrich2015strainepj
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| Authors | Ulrich, Häussler-Combe;Evmorfia, Panteki;Tino, Kühn; |
| Journal | epj web of conferences |
| Year | 2015 |
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| Keywords |
chemistry
Biology (General)
Engineering (General). Civil engineering (General)
Technology
Mechanical engineering and machinery
physics
architecture
building construction
textile bleaching, dyeing, printing, etc.
computer engineering. computer hardware
construction industry
mechanics of engineering. applied mechanics
chemicals: manufacture, use, etc.
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