Experimental investigation on the yield behavior of PMMA

Qiu, Ji; Jin, Tao; Su, Buyun; Shu, Xuefeng; Li, Zhiqiang

doi:10.1007/s00289-018-2333-y

Cited by 15 publications

(8 citation statements)

References 19 publications

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“…I1 is defined as:I1=trfalse(σijfalse) where σij is the stress tensor. As indicated by previous studies [9,41], the PMMA exhibits evident strength differential due to the different yield mechanisms. which indicates that the yielding of PMMA is sensitive to the sign of the normal stress.…”

Section: Theorymentioning

confidence: 57%

Indentation Size Effect in Pressure-Sensitive Polymer Based on A Criterion for Description of Yield Differential Effects and Shear Transformation-Mediated Plasticity

Lin

Jin

et al. 2019

Polymers

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Indentation size effects in poly(methyl methacrylate) (PMMA) were studied through nanoindentation. Two factors of indentation size effects in PMMA, namely yield criterion and shear transformation-mediated plasticity, were analysed in detail. The yield criterion that considers strength differential (SD) effects and pressure sensitivity was constructed by performing the combined shear-compression experiments. The relationship between hardness and normal stress can then be obtained based on Tabot’s relation. Shear transformation-mediated plasticity was also applied to model the measured hardness as a function of the indentation depth at different strain rates. Results show that the yield criterion contains the terms of SD effects and pressure sensitivity gives the best description of the yielding of PMMA. Additionally, the volume of single shear transformation zone calculated through the presented criterion agrees well with simulation and exhibits increases with increasing strain rate. Indentation size effects in PMMA under different strain rates were discussed and an appropriate indentation depth range was suggested for calculating the hardness and modulus.

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Section: Theorymentioning

confidence: 57%

Indentation Size Effect in Pressure-Sensitive Polymer Based on A Criterion for Description of Yield Differential Effects and Shear Transformation-Mediated Plasticity

Lin

Jin

et al. 2019

Polymers

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“…44 For the mechanical parameters input in ABAQUS 6.14, the elastic modulus determined by the proposed method and Reissner's method was used. The yield strength and Poisson's ratio of the PMMA shell took values of 70 MPa and 0.37, respectively, referring to Qiu et al's 45 and Xie et al's suggestions. 46 Although the yield strength probably is not a constant if the elastic modulus of PMMA shells is size dependent, the influence of the yield strength might be neglected in the present tests.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

Microcompression Method for Determining the Size-Dependent Elastic Properties of PMMA Microcapsules Containing n-Octadecane

et al. 2020

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Accurate evaluation of the shell elastic modulus of microcapsules is of great significance to understanding their performance during production, processing, and applications. In this work, microcompression was employed to investigate the elastic behaviors of a single microcapsule. It was modeled as a microsphere with a core–shell structure compressed between two rigid plates. Based on the assumption that the contact pressure between the microsphere and plates obeys parabolic distribution, a microcompression method derived from the Reissner’s theory and the modified Hertz contact theory was established to evaluate the shell elastic modulus. Applications were carried out on poly(methylmethacrylate) (PMMA) microcapsules containing n-octadecane. The average elastic modulus of PMMA shells measured by the proposed microcompression method agrees well with that of the bulk PMMA sample. Furthermore, the elastic modulus of PMMA shells was found to have size dependence on the diameter of the microcapsules. Finally, finite element models combined with the newly proposed method were constructed to accurately predict the microcompression behaviors of microcapsules with different sizes.

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“…Alkhader et al [ 18 ] carried out dynamic compression-shear tests on polyurea using a modified SCS geometry, ascertaining the strain rate sensitivity of the material and identifying the effect of pressure on shear response. With the SCS, Jin et al [ 19 , 20 , 21 ] studied the mechanical responses of PMMA and PA66 under different compression-shear combinations and characterized the yield of various samples under quasi-static loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Yield Surface in Polypropylene Considering Rate Effect: Stress Path Dependence

Zheng

Zhi-ping

et al. 2022

Polymers

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In order to investigate the yield surface evolution of polypropylene (PP) under dynamic impact and the relationship between yield surface parameters and the strain rate, five shear-compression specimens (SCSs) with different inclination angles are designed and produced to explore the yield behavior of PP under dynamic loading. Dynamic combined stress loading paths with different compression-shear ratios are achieved by the split Hopkinson pressure bar (SHPB). The evolution laws of the compressive stress and shear stress in the measurement region during the PP SCS compressive deformation process are analyzed. In terms of mechanical response, PP under combined compression-shear loading is of visco-elasticity plasticity and its deformation undergoes a three-stage transition, namely “unyield→yield→failure”. The yield characteristics of PP are found to be affected not only by the hydrostatic pressure but also by the stress path. According to the Hu–Pae yield criterion, the dynamic yield surface and model parameters of PP are obtained, and the relationship between the yield surface and the strain rate is ascertained. These findings contribute to deepening the research on the mechanical response characteristics of PP-based materials.

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Experimental investigation on the yield behavior of PMMA

Cited by 15 publications

References 19 publications

Indentation Size Effect in Pressure-Sensitive Polymer Based on A Criterion for Description of Yield Differential Effects and Shear Transformation-Mediated Plasticity

Indentation Size Effect in Pressure-Sensitive Polymer Based on A Criterion for Description of Yield Differential Effects and Shear Transformation-Mediated Plasticity

Microcompression Method for Determining the Size-Dependent Elastic Properties of PMMA Microcapsules Containing n-Octadecane

Experimental Study of Yield Surface in Polypropylene Considering Rate Effect: Stress Path Dependence

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