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| 双模CNT/Al复合材料变形过程的代表性体积单元模拟 |
| Deformation Simulation of Representative Volume Elements of Bimodal CNT/Al Composites |
| Received:January 20, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.04.009 |
| 中文关键词: 双模CNT/Al复合材料 RVE自动化建模 塑性变形 数值模拟 欧拉-拉格朗日耦合技术 |
| 英文关键词: bimodal CNT/Al composite automated RVE modeling plastic deformation numerical simulation Euler- Lagrange coupling technology |
| 基金项目:国家重点研发计划(2022YFB3707400);国家自然科学基金(52192594, U22A20114, 52201052);魏桥国科高研院-中国科学院金属所研发项目(GYY-JSBU-2022-011) |
| Author Name | Affiliation | | SHI Lishuo | School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China | | ZHU Zhi | School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China | | WU Di | Shi Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | | ZHANG Junfan | Shi Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | | XIAO Bolv | Shi Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | | MA Zongyi | Shi Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| 中文摘要: |
| 目的 研究双模CNT/Al复合材料在塑性加工过程中的微观结构演变行为。方法 通过ABAQUS/Python二次开发，对双模CNT/Al复合材料代表性体积单元(RVE)进行参数化建模，并基于显式动力学求解器和欧拉-拉格朗日耦合技术，对双模CNT/Al复合材料RVE模型的单向压缩过程和挤压过程进行数值模拟分析。结果 单向压缩模拟结果显示，结构心部异质区两侧的等效塑性应变较大，结构边缘基体区域的等效塑性应变相对较小;最大等效应力位于结构边角处的基体区域，而结构心部异质区的等效应力则相对较小。通过对异质区材料和形态的影响规律进行分析发现，当异质区为粗晶材料时，其变形后的形态更趋于扁平，而当异质区为细晶材料时，其变形后的形态更接近椭圆。通过挤压过程的模拟，实现了对变形过程中双模组织结构变化的分析，模拟结果显示，材料表面与模具贴合良好，异质区随变形的进行被不断拉长，部分异质区由于拉伸程度过大，甚至出现了分离的情况。结论 提出的模拟方法为双模CNT/Al复合材料的挤压变形工艺设计和变形后组织结构预测提供了有效手段。 |
| 英文摘要: |
| The work aims to explore the microstructure evolution behavior of the material in the plastic processing process. The parameterized modeling of representative volume elements (RVE) for bimodal CNT/Al composites was completed using ABAQUS/Python. Numerical simulation analysis of the unidirectional compression process of a single cell and the extrusion process of multi cells of bimodal CNT/Al composite was carried out based on the explicit dynamic solver and the Euler-Lagrange coupling technology. The simulation results of the unidirectional compression showed that the equivalent plastic strain on both sides of the heterogeneous region in the center of the structure was relatively large, while the equivalent plastic strain in the matrix region at the edge of the structure was relatively small; The maximum equivalent stress was located in the matrix region at the edges and corners of the structure, while the equivalent stress in the heterojunction region at the center of the structure was relatively small. Through analysis of the effect of heterogeneous region material and morphology, it was found that when the heterogeneous region was a coarse-grained material, its deformed morphology tended to be flatter; while when the heterogeneous region was a fine-grained material, its deformed morphology was closer to an ellipse. The changes in the bimodal microstructure during the deformation process were analyzed by simulating the extrusion process. The simulation results showed that the material surface adhered well to the mold, and the heterogeneous region was continuously stretched as deformation progresses. Some heterogeneous regions even experienced separation due to excessive stretching. This simulation method provides an effective means for the extrusion deformation process design and microstructure prediction after deformation of bimodal CNT/Al composites. |
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