Fu Weigang, Ma Junchi, Liao Zhe, Xiong Huanjie, Fu Yaoming, Wang Bin
Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618330, China.
Department of Mechanical and Aerospace Engineering, Brunel University London, Uxbridge UB8 3PH, UK.
Materials (Basel). 2023 Jul 3;16(13):4786. doi: 10.3390/ma16134786.
In order to study the effect of TiB particles on the mechanical properties of TiB/6061Al composites, a series of 3D TiB/6061Al representative volume elements (RVEs) were established based on SEM photos. This model took into account the ductile damage of the matrix and the traction separation behavior of the interface, and the linear damage evolution law was introduced to characterize stiffness degradation in the matrix elements. Mixed boundary conditions were used in the RVE tensile experiments, and the accuracy of the predicted result was verified by the agreement of the experimental stress-strain curve. The results showed that the addition of TiB particles can effectively promote the load-bearing capacity of the composite, but elongation is reduced. When the weight fraction of TiB increased from 2.5% to 12.5%, the elastic modulus, yield strength, and tensile strength increased by 8%, 10.37%, and 11.55%, respectively, while the elongation decreased by 10%. The clustering rate of the TiB particles is also an important factor affecting the toughness of the composites. With an increase in the clustering rate of TiB particles from 20% to 80%, the load-bearing capacity of the composites did not improve, and the elongation of the composites was reduced by 8%. Moreover, the high-strain region provides a path for rapid crack propagation, and particle spacing is a crucial factor that affects the stress field.
为了研究TiB颗粒对TiB/6061Al复合材料力学性能的影响，基于扫描电子显微镜（SEM）照片建立了一系列三维TiB/6061Al代表性体积单元（RVE）。该模型考虑了基体的延性损伤和界面的牵引分离行为，并引入线性损伤演化规律来表征基体单元中的刚度退化。在RVE拉伸试验中采用了混合边界条件，并通过实验应力-应变曲线的一致性验证了预测结果的准确性。结果表明，添加TiB颗粒可有效提高复合材料的承载能力，但伸长率降低。当TiB的重量分数从2.5%增加到12.5%时，弹性模量、屈服强度和抗拉强度分别提高了8%、10.37%和11.55%，而伸长率降低了10%。TiB颗粒的团聚率也是影响复合材料韧性的一个重要因素。随着TiB颗粒团聚率从20%增加到80%，复合材料的承载能力没有提高，复合材料的伸长率降低了8%。此外，高应变区域为裂纹快速扩展提供了路径，颗粒间距是影响应力场的关键因素。
