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基于数值三维重构的含缺陷非均质材料力学性能研究
Study on Mechanical Properties of Non-homogeneous Materials with Defects Based on Numerical Three-Dimensional Reconstruction
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- DOI:
- 作者:
- 苗田雨 饶磊 柏雪 游凯
MIAO Tianyu;RAO Lei;BAI Xue;YOU Kai
- 作者单位:
- 河海大学力学与材料学院
School of Mechanics and Materials,Hohai University,Nanjing 211100,China
- 关键词:
- 铸造缺陷 三维重构 非均质模型 力学性能
casting defects three-dimensional reconstruction non-homogeneous model mechanical properties
- 摘要:
- 缩松和夹渣缺陷是铸件的常见缺陷,这类缺陷非均匀地分布在铸件基体中,割裂了材料的连续性,在零件服役过程中极易引起应力集中而导致零件失效,因此综合考虑非均质性特征对材料力学性能的影响具有重要意义。本文基于平板铸钢件浇铸实验,采用连续切片法获得铸件整体切片序列影像,并基于数字图像处理构建了内含缺陷的三维空间点阵,进一步采用空间点阵映射算法建立非均质材料有限元模型,在此基础上进行了均质与非均质试样模型的拉伸过程模拟研究。结果表明,采用非均质模型能更为准确地表达试样的力学性能。
Shrinkage and slag inclusion defects were common defects of castings,which were unevenly distributed in the casting matrix,disconnecting the continuity of materials and easily causing stress concentration and failure of parts during service.Therefore,it was the great significance to comprehensively consider the influence of heterogeneous characteristics on the mechanical properties of materials.Based on flat steel casting experiment,using the method of serial section for casting slice whole sequence images,based on digital image processing and constructed with three-dimensional space lattice defects,further space lattice mapping algorithm was adopted to establish the finite element model of heterogeneous materials,on the basis of the homogeneous and heterogeneous specimen tensile process simulation of the model.The results show that the mechanical properties of the samples can be expressed more accurately by using the heterogeneous model.