For radiation shielding and lightweight requirements, fiber-reinforced polymer (FRP) composite has advantages in serving as a structure-shielding multifunctional material due to low-Z element nature and excellent mechanical properties. This study established the Monte Carlo simulation model of continuous fiber and filler reinforced epoxy composite to research neutron radiation shielding, which contains the microstructure of the composite. For validation, the numerical results of the proposed model were compared with the experimental results and found in good agreement. Then, the effects of fiber and filler distribution were studied. The neutron linear and mass attenuation coefficients of various composites were simulated to evaluate the shielding performance and lightweight effect. It shows that the boron compound is critical for shielding thermal neutrons, and the shielding effectiveness for fast neutrons mainly depends on the type of fiber. The structural design and stacking sequence of fibers and fillers significantly affect neutron shielding performance. Compared with Al-alloy, obvious low-weight advantage is obtained for shielding neutrons. The shielding mechanism and energy deposition inside composites were also analyzed.

对于辐射屏蔽和轻量化要求，纤维增强聚合物（FRP）复合材料由于低Z元素性质和优异的机械性能，在作为结构屏蔽多功能材料方面具有优势。本研究建立了连续纤维和填料增强环氧树脂复合材料的蒙特卡罗模拟模型来研究中子辐射屏蔽，其中包含了复合材料的微观结构。为了进行验证，将所提出模型的数值结果与实验结果进行了比较，发现它们非常吻合。然后，研究了纤维和填料分布的影响。模拟了各种复合材料的中子线性和质量衰减​​系数，以评估屏蔽性能和轻量化效果。这表明硼化合物对于屏蔽热中子至关重要，而对快中子的屏蔽效果主要取决于纤维的类型。纤维和填料的结构设计和堆叠顺序显着影响中子屏蔽性能。与铝合金相比，屏蔽中子具有明显的轻量化优势。还分析了复合材料内部的屏蔽机制和能量沉积。