Dear All,
I am modelling an ultra high-performance concrete plate under projectile impact, and the relevant HJC parameters are obtained from a published paper. However, I still cannot simulate the similar damage behaviour presented in the paper after several days work. The maximum principal strain of *MAT_ADD_EROSION is considered as 0.2. Relevant parameters of HJC model are also attached. Meanwhile, 072_R3 model is also calculated to make a comparison. Can you please tell me why my simulation result is so different with the author, and which one is the most suitable model for uhpfrcc in LS DYNA, k&C, HJC, Mat_elastic_plastic_Hydrodynamic or 084?
Pls find the K file, journal paper and simulation result attached.
Thanks!
http://www.sciencedirect.com/science/article/pii/S016784420900024X
Investigation of Ultra-high Performance Concrete Under Static and Blast Loads
By Jun Li, Chengqing Wu, Hong Hao and Yu Su
Abstract
Conventional concrete works as an important construction material. However, conventional concrete is known to be brittle and prone to tensile failure and cracks. To overcome such defects and improve the dynamic performance of concrete against extreme loading conditions, concrete with different additions and formulae have been developed. In a recent study, to develop ultra-high performance concrete (UHPC) material with better strength and crack control ability, super fine aggregates with high pozzolanic effect were mixed into the steel fibre reinforced concrete instead of the traditional graded coarse aggregates. Furthermore, to achieve high early age strength, nanoscale additives which can accelerate the hydration process of the ordinary Portland cement were also introduced into the concrete composite. A series of uniaxial compression and four-point bending tests had been performed in the laboratory to get the material properties of this innovative concrete material. Great improvement of the concrete uniaxial compressive strength and flexural tensile strength was observed. Field blast tests were carried out on columns made of this UHPC material. Superior blast resistance performance was observed. In the current study, based on the available test data, numerical models are developed and numerical simulations are carried out. The simulation results are found to comply well with the experimental results.
......
Article Investigation of Ultra-high Performance Concrete Under Stati...
Hi Mohannad,
Thanks for your kind help.
I compared numerical simulation result of MAT_10 with laboratory result. Unfortunately, the damaged area was too small, which just happened around the penetration zone.
So far, I used HJC, Mat_10 and Mat_72 to simulate the projectile penetration. The results show Mat_72 was more appropriate. However, the single element result of MAT_72 did not reflect the strain hardening behavior of UHPC.
Hi Mr. Yang,
Can you share the material properties you have used for your 072 model and HJC model ?
I believe it has something to do with the concrete properties definition.
@Abhijit Kulkarni
Hi Abhijit,
There are many reasons which are related to the characteristics of materials model in LS DYNA. For example, HJC is more suitable for concrete under projectile penetration (i.e., residual velocity and penetration depth), while Mat_72 performs better results in explosive blast.
You could read a paper published by Prof. Yong Lu from the university of Edinburgh, in which he comprehensively compared the widely used material models for concrete. You can find the paper inArticle Evaluation of typical concrete material models used in hydro...
Cheers,
Lei
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