基于多尺度联合仿真的汽车前罩刚度分析
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摘要
为提高复合材料汽车前罩刚度仿真精度,以高性能增强聚丙烯热塑性复合材料作为汽车前罩材料,通过Helius PFA软件将模流分析所得内外板纤维取向张量、残余应变结果映射至结构刚度分析模型,并添加非线性弹塑性材料建立多尺度联合仿真模型进行扭转刚度、前部弯曲刚度、后部弯曲刚度仿真,其仿真结果和传统仿真结果与实验结果对比分析。结果表明,基于多尺度联合仿真模型的仿真结果更贴近实验值,最小误差为3. 7%,最大误差为9. 5%,相对传统仿真方法误差最大减少17%,验证了多尺度联合仿真方法具有更高精度和可靠性。该方法可为同类复合材料注塑制品的结构设计优化提供参考和应用价值。
In order to improve the stiffness simulation precision of composite vehicle hood, high performance reinforced polypropylene thermoplastic composites were used as the automobile hood materials.The results of fiber orientation tensors and residual strains from the inner panel and the outer panel obtained by moldflow analysis were mapped to structural stiffness analysis model by Helius PFA software. And nonlinear elastoplastic materials were added to establish a multi-scale co-simulation model to simulate the torsional stiffness,front bending stiffness and rear bending stiffness. The analysis results and the traditional simulation results were compared with experimental results. The results show that the simulation results based on multiscale co-simulation model are closer to the experimental value,the minimum error is 3. 7%,the maximum error is 9. 5%,and the error is decreased up to 17%comparing with the traditional simulation method,which verifies the higher accuracy and reliability of the multi-scale co-simulation method. This method could provide reference and application value for structural design optimization of similar composite injection molded products.
In order to improve the stiffness simulation precision of composite vehicle hood, high performance reinforced polypropylene thermoplastic composites were used as the automobile hood materials.The results of fiber orientation tensors and residual strains from the inner panel and the outer panel obtained by moldflow analysis were mapped to structural stiffness analysis model by Helius PFA software. And nonlinear elastoplastic materials were added to establish a multi-scale co-simulation model to simulate the torsional stiffness,front bending stiffness and rear bending stiffness. The analysis results and the traditional simulation results were compared with experimental results. The results show that the simulation results based on multiscale co-simulation model are closer to the experimental value,the minimum error is 3. 7%,the maximum error is 9. 5%,and the error is decreased up to 17%comparing with the traditional simulation method,which verifies the higher accuracy and reliability of the multi-scale co-simulation method. This method could provide reference and application value for structural design optimization of similar composite injection molded products.
引文
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[12]张胜强,张营,朱盼,等.汽车复合材料前端模块工艺及性能仿真的发展综述[J].汽车实用技术,2017(24):153-155.
[13]张玉丽,邱炜,傅南红,等.基于多尺度联合仿真的注塑制品轻量化设计[J].中国塑料,2018,32(9):130-134.
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[2]张超,徐洪耀,夏建盟,等.长玻璃纤维增强聚丙烯复合材料力学性能研究[J].塑料工业,2017,45(12):78-82.
[3]李西顺,杨明华,孙正峰.车用塑料件的模流与结构联合仿真分析[J].计算机辅助工程,2017,26(5):17-22.
[4]丁智平,黄达勇,荣继刚,等.长玻璃纤维增强复合材料注塑成型构件强度分析[J].材料工程,2018,46(4):111-119.
[5]龚友坤,王韬,姚远,等.汽车底盘碳纤维后纵臂成形实验与分析[J].汽车工程,2016,38(2):248-251.
[6]吴纯,张伟,KIM S,等.长玻璃纤维改性聚丙烯在汽车领域中的应用与展望[J].上海塑料,2016(4):23-25.
[7]聂根辉,谢新生,欧阳春平.PP-LGF40材料发动机罩结构设计与性能分析[J].汽车零部件,2017(4):11-15.
[8]陈越,张蕾.基于Opti Struct的复合材料发动机罩结构轻量化设计[J].机械设计与制造,2018(8):122-125.
[9]郭永奇,黄小征,王帅,等.基于等刚度原理的碳纤维发动机罩开发[J].汽车实用技术,2017(19):100-103.
[10]秦计生,彭雄奇,申杰,等.考虑纤维方向分布的玻璃纤维增强PP复合材料拉伸性能[J].复合材料学报,2013,30(4):53-58.
[11]丁智平,黄达勇,荣继刚,等.注塑成型短玻璃纤维增强复合材料各向异性弹性常数预测方法[J].机械工程学报,2017,53(24):126-134.
[12]张胜强,张营,朱盼,等.汽车复合材料前端模块工艺及性能仿真的发展综述[J].汽车实用技术,2017(24):153-155.
[13]张玉丽,邱炜,傅南红,等.基于多尺度联合仿真的注塑制品轻量化设计[J].中国塑料,2018,32(9):130-134.
[14]都雪静,王艺群.复合材料发动机罩的行人头部保护研究[J].中国安全科学学报,2017,27(12):43-48.