基于显微CT图像的近场动力学建模与复合材料微结构破坏模拟  

Peridynamic Modeling through Micro-CT Images for Failure Simulation of Composite Microstructure

作　　者：张建宇 韩非 江柏红[2] 林晔 Jianyu Zhang;Fei Han;Baihong Jiang;Ye Lin(State Key Laboratory of Structural Analysis for Industrial Equipment,Department of Engineering Mechanics,International Research Center for Computational Mechanics,Dalian University of Technology,Dalian,116024;Research Institute of Aerospace Special Materials and Technology,Beijing,100074;Beijing Aerospace Technology Institute,Beijing,100074)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室工程力学系,大连116024 [2]航天特种材料及工艺技术研究所,北京100074 [3]北京空天技术研究所,北京100074

出　　处：《固体力学学报》2022年第2期143-157,共15页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金项目(11872016);中央高校基本科研业务费(DUT20RC(5)005,DUT20LAB203);辽宁省重点研发计划项目(2020JH2/10500003)资助。

摘　　要：随着纤维增强复合材料应用领域的不断扩展且用量激增,亟需理清复合材料微观结构损伤对宏观力学性能影响的内在机制.因此,发展针对纤维增强复合材料微结构破坏过程的建模与高效模拟方法就显得十分重要.论文借助显微CT(Micro-computed Tomography)扫描技术,提出了一种基于显微CT图像中像素点离散的近场动力学建模与模拟方法.一方面,近场动力学作为一种由积分方程建模的非局部理论,便于采用基于空间点离散的数值计算方法,相比传统的连续介质力学能够更有效地模拟材料从连续变形到裂纹萌生与扩展(非连续变形)的全过程.另一方面,对显微CT图像使用像素点灰度阈值分割操作,能够快速建立含有复合材料原位微结构信息的空间点离散模型.该离散模型可以直接用于微结构破坏过程的近场动力学模拟,从而避免了传统的数值模拟技术需要依据像素点先建立光滑的几何模型、再划分成有限单元网格的复杂前处理过程,并且极大地保留了复合材料的原位组分分布信息.数值模拟结果表明,基于显微CT图像的近场动力学建模方法能够精确捕捉到复合材料微结构信息,并能准确模拟纤维增强复合材料的微结构破坏过程.With the continuous expansion of the fields of fiber-reinforced composites,the effect of microstructural damage on the mechanical properties of composites has become an essential yet unclarified issue.Therefore,it is necessary to develop a feasible and efficient method to model and simulate the microstructural failure of fiber-reinforced composites.In this paper,a peridynamic computational scheme is proposed to simulate the failure of composite microstructure,using discrete pixel points of micro-computed tomography(micro-CT)images taken from the micro-CT scanning technology.Peridynamics is a nonlocal theory based on integral equations.Therefore,it is more convenient to implement particle-based numerical methods,making it more effective in simulating the failure process from deformation to fracture.By introducing the gray threshold segmentation technology into the micro-CT image processing,a particle discretization containing in-situ information of composite materials can be obtained,which is employed for peridynamic simulations.Consequently,the complex geometric reconstruction and finite element partition are unnecessary,whereas the in-situ information of composite microstructure,such as fiber,matrix,and voids,is preserved as possible.The simulation results show that the peridynamic modeling based on micro-CT images can accurately capture the microstructure information of composites and successfully simulate the failure evolution of composite materials.

关 键 词：近场动力学 显微CT 复合材料微结构 图像处理 破坏模拟 

分 类 号：TB332[一般工业技术—材料科学与工程]