Abstract
Carbon/Phenolic (C/P), a typical anisotropic material, is an important component of aerospace and often used to protect the thermodynamic effects of strong X-ray radiation. In this paper, we establish the anisotropic elastic-plastic constitutive model, which is embedded in the in-house code “RAMA” to simulate a two-dimensional thermal shock wave induced by X-ray. Then, we compare the numerical simulation results with the thermal shock wave stress generated by the same strong current electron beam via experiment to verify the correctness of the numerical simulation. Subsequently, we discuss and analyze the rules of thermal shock wave propagation in C/P material by further numerical simulation. The results reveal that the thermal shock wave represents different shapes and mechanisms by the radiation of 1 keV and 3 keV X-rays. The vaporization recoil phenomenon appears as a compression wave under 1 keV X-ray irradiation, and X-ray penetration is caused by thermal deformation under 3 keV X-ray irradiation. The thermal shock wave propagation exhibits two-dimensional characteristics, the energy deposition of 1 keV and 3 keV both decays exponentially, the energy deposition of 1 keV-peak soft X-ray is high, and the deposition depth is shallow, while the energy deposition of 3 keV-peak hard X-ray is low, and the deposition depth is deep. RAMA can successfully realize two-dimensional orthotropic elastoplastic constitutive relation, the corresponding program was designed and checked, and the calculation results for inspection are consistent with the theory. This study has great significance in the evaluation of anisotropic material protection under the radiation of intense X-rays.
Highlights
Carbon/Phenolic (C/P), as an advanced type of anisotropic composite material, and has been widely used in the field of aerospace [1,2]
1990s, many countries have carried out research on the application of anisotropic constitutive models in numerical simulation, and some of the research results have been used in the recent version of the finite element large-scale shock dynamics numerical simulation software, such as LS-DYNA970, that embeds transversely isotropic and orthotropic elastoplastic constitutive models [13]
The results show the peak value of the thermal shock wave increases with the increase in energy fluence, but its growth rate not consistent
Summary
Carbon/Phenolic (C/P), as an advanced type of anisotropic composite material, and has been widely used in the field of aerospace [1,2]. 1990s, many countries have carried out research on the application of anisotropic constitutive models in numerical simulation, and some of the research results have been used in the recent version of the finite element large-scale shock dynamics numerical simulation software, such as LS-DYNA970, that embeds transversely isotropic and orthotropic elastoplastic constitutive models [13] These models make the software capable of analyzing the dynamic response of fiber-reinforced composites. For C/P, the experimentally measured thermal shock wave stress peak decays faster than numerical simulation We think this is likely to be the deviation caused by approximating the composite material with anisotropic model in the numerical simulation. There is no report about the use of the C/P anisotropic dynamic constitutive model for numerical simulation of two-dimensional X-ray thermal shock wave propagation worldwide. The experimental results show that the anisotropic propagation law of materials is basically consistent with the experimental results
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