碳化硼/环氧树脂复合材料的力学性能及疲劳寿命

Mechanical Properties and Fatigue Life of Boron Carbide/Epoxy Resin Composites

碳化硼是良好的中子吸收剂,作为填充材料与环氧树脂复合后有望成为综合性能优良的中子辐射屏蔽材料。为研究碳化硼纳米粒子对环氧树脂力学性能的影响,制备了不同组分的碳化硼/环氧树脂复合材料并对其进行单轴拉伸、三点弯、动态机械性能分析和疲劳试验,发现碳化硼的质量分数为1.5%时复合材料具有最优的韧性和强度。利用Fe-safe软件对碳化硼/纯环氧树脂复合材料进行疲劳寿命的数值模拟,模拟结果能够与疲劳试验很好地吻合,从而为复合材料的疲劳寿命预测提供了方法;结合ABAQUS对纳米粒子/树脂基体两相模型进行数值模拟,明晰了碳化硼增强增韧环氧树脂的机制,为碳化硼/环氧树脂复合材料在航空和核电等领域的应用奠定了基础。

Boron carbide was a good neutron absorber,and it was expected to become a neutron radiation shielding material with excellent comprehensive properties after being compounded with epoxy resin as a filler material.In order to study the effect of boron carbide nanoparticles on the mechanical properties of epoxy resins,boron carbide/epoxy resin composites with different components were prepared and subjected to uniaxial stretching,three-point bending,dynamic mechanical property analysis and fatigue analysis.In the experiment,it is found that the composite material has the optimal toughness and strength when the boron carbide content is 1.5%.The Fe-safe software is used to carry out the numerical simulation of the fatigue life of the boron carbide/pure epoxy resin composite material,and the analysis results are in good agreement with the fatigue test,which provides a method for the prediction of fatigue life of composite materials.Combining with ABAQUS,the nanoparticle/resin matrix two-phase model is numerically simulated,and the mechanism of boron carbide to strengthen and toughen epoxy resin is clarified,which lays a foundation for the application of boron carbide/epoxy composites in aviation and nuclear power.