陈德成,张浩男,李建超,等.长径比对TiB/Ti6Al4V网状复合材料力学行为的影响[J].精密成形工程,2024,16(4):19-27.
CHEN Decheng,ZHANG Haonan,LI Jianchao,et al.Effect of Aspect Ratio on Mechanical Behaviors of TiB/Ti6Al4V Composites with Network Architecture[J].Journal of Netshape Forming Engineering,2024,16(4):19-27. |
| 长径比对TiB/Ti6Al4V网状复合材料力学行为的影响 |
| Effect of Aspect Ratio on Mechanical Behaviors of TiB/Ti6Al4V Composites with Network Architecture |
| 投稿时间：2024-01-20 |
| DOI：10.3969/j.issn.1674-6457.2024.04.003 |
| 中文关键词: 钛基复合材料 网状构型 长径比 有限元分析 损伤断裂 |
| 英文关键词: titanium matrix composite network architecture aspect ratio finite element analysis failure and fracture |
| 基金项目:国家重点研发计划(2022YFB3707401);国家自然科学基金(52101184);浙江省“领雁”计划(2022C01087);浙大宁波科创中心人才启动项目(NBCL2023X006) |
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| 中文摘要: |
| 目的 针对高性能钛基复合材料开发过程中所面临的强韧性倒置问题，对网状构型钛基复合材料拉伸行为进行仿真，以揭示增强体长径比对材料强度与韧性的影响机理。方法 针对TiB/Ti6Al4V网状构型复合材料体系，构建增强相长径比不同的复合材料有限元模型，分别进行拉伸行为仿真，并对其应力-应变曲线、应力集中系数、应力云图和应变云图等进行预测与分析。结果 随着增强相TiB长径比的增大，复合材料的断裂伸长率单调递增，弹性模量与抗拉强度则呈先下降后上升的趋势。结论 增强相长径比是影响复合材料力学性能的重要参数。增强相的长径比和局部体积分数的共同作用导致复合材料模量和强度随长径比的增大先降低后升高。此外，随着TiB长径比的增大，断口更加曲折，主裂纹多次偏转扩展方向，并沿着TiBw/Ti6Al4V-Ti6Al4V“限域”界面扩展，进而消耗了大量的体系能量，这对材料韧化有积极影响。 |
| 英文摘要: |
| Aiming at the trade-off issue between strength and ductility in the development of high-performance titanium matrix composites (TMCs), the work aims to simulate the tensile behavior of TMCs with network architecture to reveal the effect and mechanism of aspect ratio on strength and ductility of TiB/Ti6Al4V composites. Aiming at the TiB/Ti6Al4V composite system with network architecture, the finite element (FE) models with different aspect ratios were constructed and the tensile behavior was simulated respectively. The stress-strain curves, stress concentration factor, stress and strain map of TiB/Ti6Al4V composites were analyzed. With the increasing aspect ratio of TiB, the elongation increased, while the Young's modulus and tensile strength firstly decreased and then increased. The aspect ratio is an important parameter affecting the mechanical properties of composites. The combined action of aspect ratio and local volume fraction leads to the decrease of modulus and strength of composites at first and then the increase with the increase of aspect ratio. In addition, with the increase of the aspect ratio of TiB, the fracture becomes more tortuous, and the main crack deflects and propagates along the "confined" interface of Tiw/Ti6Al4V-Ti6Al4V for many times, thus consuming a lot of system energy, which has a positive impact on the toughness of materials. |
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