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Characterization of material mechanical properties using strain correlation method combined with virtual fields method

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Acta Mechanica Sinica 2021年第3期37卷 456-471,I0002页

作者： Yangyang Li Jiaqiang Li Qiyuan Duan Huimin Xie Sheng Liu School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Institute of Technological Sciences Wuhan UniversityWuhan 430072China Lab for Hydropower Transients of Ministry of Education School of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China

The isotropic and anisotropic behaviors are considered as the important formats of the constitutive behaviors,and can also be called the global *** improve the identification ability of virtual fields method(VFM)when the global properties are unknown,this paper proposes the strain correlation method(SCM)to determine the global properties before the parameter identification using the ***,the basic principle of SCM is described in ***,the feasibility and accuracy of SCM are verified through the numerical experiments based on the three-point bending configuration and the real experiment of polymethyl methacrylate(PMMA).The influence of the additive Gaussian white noise,local errors in the strain fields,and missing data at the specimen edges on the characterization results are *** results show that the SCM has good noise immunity and lower accuracy requirements for the strain *** an application,the mechanical properties of Ti-6A1-4V alloys fabricated by selective laser melting(SLM)are characterized by the *** results show that the alloys are isotropic,and the isotropic VFM is utilized to determine the mechanical *** using the SCM,the accuracy of identification results can be improved for the isotropic or bidirectional reinforced orthotropic materials when using VFM.

关键词： Global properties Constitutive parameter identification Strain correlation method virtual fields method

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Characterization for elastic constants of fused deposition modelling-fabricated materials based on the virtual fields method and digital image correlation

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Acta Mechanica Sinica 2017年第6期33卷 1075-1083页

作者： Quankun Cao Huimin Xie AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China

Fused deposition modelling(FDM), a widely used rapid prototyping process, is a promising technique in manufacturing engineering. In this work, a method for characterizing elastic constants of FDM-fabricated materials is proposed. First of all, according to the manufacturing process of FDM, orthotropic constitutive model is used to describe the mechanical behavior. Then the virtual fields method(VFM) is applied to characterize all the mechanical parameters(Q, Q, Q, Q) using the full-field strain,which is measured by digital image correlation(DIC). Since the principal axis of the FDM-fabricated structure is sometimes unknown due to the complexity of the manufacturing process, a disk in diametrical compression is used as the load configuration so that the loading angle can be changed conveniently. To verify the feasibility of the proposed method, finite element method(FEM) simulation is conducted to obtain the strain field of the disk. The simulation results show that higher accuracy can be achieved when the loading angle is close to 30?. Finally, a disk fabricated by FDM was used for the experiment. By rotating the disk, several tests with different loading angles were conducted. To determine the position of the principal axis in each test, two groups of parameters(Q, Q, Q, Q) are calculated by two different groups of virtual fields. Then the corresponding loading angle can be determined by minimizing the deviation between two groups of the parameters. After that, the four constants(Q, Q, Q, Q) were determined from the test with an angle of 27?.

关键词： Fused deposition modelling virtual fields method Digital image correlation Orthotropic constitutive model Disk compression

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Identification of Low Density Polyurethane Foam Properties by the Digital Image Correlation Measurement and the virtual fields method

Identification of Low Density Polyurethane Foam Properties b...

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International Conference on Experimental Mechanics 2008 (ICEM 2008)

作者： Fabrice Pierron LMPF ENSAMRue St DominiqueBP 50851006 Ch■lons-en-Champagne CedexFrance

＜正＞This paper deals with the identification of the constitutive behavior of low density polyurethane foam using digital image correlation（DIC） and the virtual fields *** the so-called Iosipescu flexion tests in t... 详细信息

关键词： low density polyurethane foam digital image correlation great deformation image processing virtual fields method auxetic

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