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短纤维插层对亚麻纤维增强复合材料层间增韧效果的实验与数值仿真研究

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Acta Mechanica Sinica 2024年第1期40卷 183-196页

作者：于本泽李岩涂昊昀章中森 school of aerospace engineering and applied mechanics Tongji UniversityShanghai 200092China Key Laboratory of Advanced Civil engineering Materials Ministry of EducationTongji University Shanghai 200092China

本文分别通过双悬臂梁(DCB)实验与数值模拟,研究了不同短纤维插层(包括短纤维种类、短纤维长度与插层面密度)对亚麻纤维增强复合材料I型层间断裂韧性的影响规律.DCB试验结果表明,当插层为5mm长度、25g/m^(2)面密度的短碳纤维插层时,复... 详细信息

本文分别通过双悬臂梁(DCB)实验与数值模拟,研究了不同短纤维插层(包括短纤维种类、短纤维长度与插层面密度)对亚麻纤维增强复合材料I型层间断裂韧性的影响规律.DCB试验结果表明,当插层为5mm长度、25g/m^(2)面密度的短碳纤维插层时,复合材料1型层间断裂韧性达到2.322kJ/m^(2),取得最大提升幅度80.7%,短纤维桥联与亚麻连续纤维多层级破坏为其主要增韧机理。在此基础上,采用五参数控制的三线性内聚力单元,建立了数值仿真模型。实验与数值模拟结果的对比分析揭示了短纤维插层属性与内聚力模型参数之间的定量关系,可为植物纤维增强复合材料短纤维插层增韧设计提供参考依据.

关键词：纤维增强复合材料内聚力模型层间断裂韧性连续纤维增韧机理内聚力单元实验与数值模拟插层

Multi-Scale Structures of Natural Fibers

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Multi-Scale Structures of Natural Fibers

单向复合材料均质化弹性性能预测的集成学习模型:基于SHAP方法的可解释性分析

中国力学学会学术大会'2009

作者： yan Li,Feng L(u|¨),Xiaojun Chen,Yehong Yu school of aerospace engineering and applied mechanics, tongji university Key Laboratory of Advanced Civil engineering Materials,Ministry of Education 1239 Siping Road,shanghai,200092,china

In this study,four kinds of natural fibers(ramie, sisal,jute and kenaf) which were extracted from different plant sources were ***-scale structures of these natural fibers were revealed with the aids of scanning-elect... 详细信息

关键词： natural fiber composites microstructure Mechanical properties

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Acta Mechanica Sinica 2024年第3期40卷 109-122页

作者：王文照赵云妹李岩 school of aerospace engineering and applied mechanics Tongji UniversityShanghai 200092China

本研究提出了一种可解释的集成学习(EML)数据驱动方法,用于快速预测单向纤维增强复合材料的均质化弹性性能.我们选择了三种机器学习模型――随机森林(RF)、极端梯度提升机(XGBoost)和轻量梯度提升机(LGBM)来构建EML模型.基于实验并建立... 详细信息

本研究提出了一种可解释的集成学习(EML)数据驱动方法,用于快速预测单向纤维增强复合材料的均质化弹性性能.我们选择了三种机器学习模型――随机森林(RF)、极端梯度提升机(XGBoost)和轻量梯度提升机(LGBM)来构建EML模型.基于实验并建立微观纤维分布的概率统计模型,结合有限元仿真,建立了反映纤维随机分布特征的代表性体元(RVE)模型,并创建相关数据集.通过准确性、效率、可解释性和泛化性等指标对EML模型的性能进行了全面评估,研究结果表明:(1)EML模型有效提升了基机器学习模型的预测精度(R2=0.962,MS E=5.41);(2)我们使用基于合作博弈理论的SHAP可解释性方法对预测结果进行了分析,其中,全局解释发现纤维的体积含量是影响复合材料均质化弹性性能的决定性变量,而局部解释阐明了输入特征对预测结果的关键影响机制;(3)EML模型在实验数据上表现出良好的泛化能力,计算结果与实验数据吻合度高,实现了复合材料均质化弹性性能的高效精准预测.

关键词： Composite materials Homogenization Ensemble learning Interpretation Model generalization

纤维增强热固性树脂基复合材料成型过程数值模拟研究进展

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材料工程 2024年第5期52卷 46-56页

作者：赵华坤于涛程泽非徐鉴李岩同济大学航空航天与力学学院上海200092

纤维增强热固性树脂基复合材料在高端制造领域应用广泛,其固化过程涉及树脂流动、固化反应发生、残余应力引发固化变形等多个步骤。数值模拟纤维增强热固性树脂基复合材料的工艺成型过程是一个多场耦合的复杂问题,建立完善的数值模拟方... 详细信息

纤维增强热固性树脂基复合材料在高端制造领域应用广泛,其固化过程涉及树脂流动、固化反应发生、残余应力引发固化变形等多个步骤。数值模拟纤维增强热固性树脂基复合材料的工艺成型过程是一个多场耦合的复杂问题,建立完善的数值模拟方法用来预测其成型过程中的固化行为对于工艺类型选择、工艺参数设计和复合材料构件性能优化具有重要的理论与实践意义。本文归纳了数值模拟纤维增强热固性树脂基复合材料成型过程的主要研究进展,并讨论了不同数值模型的适用条件,通过分析同一问题不同模型的适用条件可以为复合材料固化工艺及参数设计的选择提供指导。提升精度和降低成本是数值模型迭代优化的主要研究方向。在此基础上,本文对数值模拟纤维增强热固性树脂基复合材料成型过程进行了总结,并认为未来可以从复合材料的树脂流动多尺度建模、机器学习与材料基因组方法在复合材料的构件优化设计中的应用和残余应力对复合材料的性能及使用寿命的影响等方面开展研究。

关键词：纤维增强复合材料数值模拟热固性树脂成型工艺

Debris effect on the surface wear and damage evolution of counterpart materials subjected to contact sliding

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Advances in Manufacturing 2022年第1期10卷 72-86页

作者： Wei Li Liang-Chi zhang Chu-Han Wu Zhen-Xiang Cui Chao Niu yan Wang school of Mechanical and Manufacturing engineering The University of New South WalesSydneyNSW 2052Australia Shenzhen Key Laboratory of Cross-Scale Manufacturing mechanics Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China SUSTech Institute for Manufacturing Innovation Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Department of mechanics and aerospace engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Baoshan Iron&Steel Co. LtdShanghai 200941People’s Republic of China

This paper aims to explore the debris effect on surface wear and damage evolution of counterpart materials during contact sliding.A cylinder-on-flat testing configuration is used to investigate the wear behaviours of the contact *** explore the roles of wear debris,compressed air is applied to remove the debris in sliding *** comparative study demonstrates that the influence of debris removal is related to the surface properties of contact *** substantial wear debris accumulates on the tool surface,debris removal can considerably alter surface damage evolution,resulting in different friction transitions,distinct surface morphology of contact pair,as well as different rates of material *** has been found that the surface damage evolution will not reach a stable stage unless the increase of wear particle number ceases or the average size of wear particles becomes lower than a specific ***,the influence of debris removal reduces when the adhesion between the contact pair materials gets smaller.

关键词： Sliding wear Debris effect Debris distribution Contact sliding Metal forming

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颗粒增强复合材料的屈服极限

固体力学学报 2021年第6期42卷 718-724页

作者：张若京刘岩同济大学应用力学研究所上海200092 鲁东大学土木工程学院烟台264025

基于渐近均匀化方法,导出了颗粒增强复合材料的屈服准则,给出了初始屈服应力的解析表达式.因为颗粒增强体的弹性模量远比弹塑性基体的弹性模量高,这个模量差在增强体和基体中产生了装配刚度.解局部问题可以得到该装配刚度.从屈服应力的... 详细信息

基于渐近均匀化方法,导出了颗粒增强复合材料的屈服准则,给出了初始屈服应力的解析表达式.因为颗粒增强体的弹性模量远比弹塑性基体的弹性模量高,这个模量差在增强体和基体中产生了装配刚度.解局部问题可以得到该装配刚度.从屈服应力的表达式可以看出,装配刚度和基体的剪切模量之比,以及增强体和基体两者的剪切模量之比决定了屈服极限的提高程度.给出了两个数值算例.采用菱形十二面体单胞求解了局部问题.取单胞形状为菱形十二面体的优点是增强体的体积比可以高达74%.

关键词：复合材料屈服极限屈服准则渐近均匀化

Modeling of micropipette aspiration and optical tweezers stretching of erythrocytes with or without Malaria parasite

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Theoretical & applied mechanics Letters 2013年第3期3卷 59-64页

作者： Guyue Jiao ruojing zhang school of aerospace engineering and applied mechanics tongji university

The erythrocytes play an important role in the human body. The healthy erythrocytes can undergo extremely large deformation while passing through small capillaries. Their infection by Malaria Plasmodium falcipurum （P.f.） will lead to capillary blockage and blood flow obstruction. Many experimental and computational methods have been applied to study the increase in stickiness and decrease in deformability of the Malaria （P.f.） infected erythrocytes. The novelty of this paper lies in the establishment of an multi-component model for investigating mechanical properties of Malaria （P.f.） infected erythrocytes, especially of their enclosed parasites. Finite element method was applied to simulate the erythrocytes＇ deformation in micropipette aspiration and optical tweezers stretching using the computational software ABAQUS. The comparisons between simulations and experiments were able to quantitatively conclude the effects of stiffness and stickiness of the parasitophorous vacuole membrane on the cells＇ deformation, which could not be obtained from experiments directly.

关键词： cell mechanics Malaria infected red blood cells micropipette aspiration finite elementmethod hyperelasticity

Development of impact resistant 3D printed multi-layer carbon fibre reinforced composites by structural design

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Acta Mechanica Sinica 2022年第8期38卷 89-101页

作者： Zhen Huang Kunkun Fu yan Li Cheng yan school of aerospace engineering and applied mechanics Tongji UniversityShanghai200092China school of Mechanical Medical and Process EngineeringCentre for Materials ScienceQueensland University of TechnologyBrisbane2434Australia

In this study,a high impact resistant multi-layered composite consisting of continuous carbon fibre/nylon(CCF)and short carbon fibre/nylon(SCF)layers is developed via 3D printing *** effect of CCF/SCF layers configuration on the impact resistance is investigated by low-velocity impact test,and the impact failure mechanism of the 3D printed composites is explored by microscopic observations and finite element(FE)simulation *** results show that the 3D printed multi-layered composite with SCF layers distributed in the middle(HFA)exhibits higher impact resistant performance than the specimens with alternating SCF/CCF layers(HFB)and CCF layers distributed in the middle(HFC).The effect of CCF/SCF layers proportion on the impact performance is also studied by FE simulation,and the results show that the specimen with a CCF/SCF proportion of 7.0 exhibits the highest impact strength.

关键词： Multi-layered carbon fibre composite 3D printing Impact strength Structural configuration

Review of recent developments in cement composites reinforced with fibers and nanomaterials

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Frontiers of Structural and Civil engineering 2021年第1期15卷 1-19页

作者： Jianzhuang XIAO Nv HAN yan LI Zhongsen zhang Surendra P.SHAH College of Civil engineering Tongji UniversityShanghai 200092China school of aerospace engineering and applied mechanics Tongji UniversityShanghai 200092China Center for Advanced Cement-Based Materials Northwestern UniversityEvanstonIL 60208USA

The quest for high-performance construction materials is led by the development and application of new reinforcement materials for cement *** reinforcement with fibers has a long ***,many new fibers associated with high performance and possessing eco-environmental characteristics,such as basalt fibers and plant fibers,have received much attention from *** addition,nanomaterials are considered as a core material in the modification of cement composites,specifically in the enhancement of the strength and durability of *** paper provides an overview of the recent research progress on cement composites reinforced with fibers and *** influences of fibers and nanomaterials on the fresh and hardened properties of cement composites are ***,future trends in the application of these fibers or of nanomaterial-reinforced cement composites are proposed.

关键词： cement composites fiber nanomaterial mechanical property durability