Wang Dengwang, Gao Yong, Wang Sheng, Wang Jie, Li Haipeng
Department of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710000, China.
Materials (Basel). 2021 Jun 25;14(13):3553. doi: 10.3390/ma14133553.
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.
碳/酚醛（C/P）是一种典型的各向异性材料，是航空航天领域的重要组成部分，常用于抵御强X射线辐射的热动力学效应。本文建立了各向异性弹塑性本构模型，并将其嵌入自编程序“RAMA”中，以模拟X射线诱导产生的二维热激波。然后，通过实验将数值模拟结果与相同强流电子束产生的热激波应力进行比较，以验证数值模拟的正确性。随后，通过进一步的数值模拟对热激波在C/P材料中的传播规律进行了讨论和分析。结果表明，1keV和3keV X射线辐射下热激波呈现出不同的形态和机制。在1keV X射线辐照下，汽化反冲现象表现为压缩波，而在3keV X射线辐照下，X射线穿透是由热变形引起的。热激波传播呈现二维特征，1keV和3keV的能量沉积均呈指数衰减，1keV峰值软X射线的能量沉积高且沉积深度浅，而3keV峰值硬X射线的能量沉积低且沉积深度深。RAMA能够成功实现二维正交各向异性弹塑性本构关系，设计并检查了相应程序，检查计算结果与理论一致。本研究对于评估强X射线辐射下各向异性材料的防护具有重要意义。
