纸力学特性尺寸效应及其理论模型
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1.西安科技大学理学院;2.西安科技大学地质与环境学院

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TB332

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)12172280, 52268047, 51868075;陕西省自然科学基金重点项目(2020JZ-53)


Size effect of mechanical properties of paper and its theoretical model
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1.College of Sciences,Xi'2.'3.an University of Science and Technology,Xi’an Shaanxi;4.College of Geology and Environment,Xi’an University of Science and Technology,Xi’an Shaanxi

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    摘要:

    纸或纸基材料在使用和服役时对其力学特性有一定要求,但是现有尺寸效应实验和理论说明不同尺寸试样力学特性并不相同,因此明确其力学特性的尺寸效应对于保证其安全非常必要。本文选用易于获取且强度较高的牛皮纸为研究材料,开展不同尺寸试样单轴拉伸试验,确定力学特性及其离散性随试样尺寸的变化规律。分析不同尺寸牛皮纸受力变形特征和宏微观破坏特征,揭示牛皮纸力学特性尺寸效应内在机理。最后建立牛皮纸力学特性尺寸效应模型。研究发现:牛皮纸名义拉伸强度和名义峰值应变随尺寸增大先增大后下降,这是因为切断的边缘纤维造成牛皮纸试样边缘承受应力和应变能力较弱,而小尺寸试样中弱化边缘占比较大,导致名义拉伸强度和名义峰值应变呈现上升尺寸效应;大尺寸试样中,弱化边缘占比可以忽略,内部断裂过程区起主导作用,导致名义拉伸强度和名义峰值应变呈下降尺寸效应。建立的边缘-内部断裂过程区尺寸效应模型能较好的描述牛皮纸名义拉伸强度和名义峰值应变的尺寸效应,但是其不能体现名义拉伸强度和名义峰值应变上升尺寸效应阶段的非线性特征。

    Abstract:

    There are certain requirements for the mechanical properties of paper or paper-based materials during their service. However, existing experimental and theoretical studies of size effects indicate that the mechanical properties of specimens with different sizes are not identical. Therefore, it is necessary to clarify the size effect of their mechanical properties to ensure their safety. The kraft paper, which is easy to obtain and has high strength, is selected to carry out uniaxial tensile tests on with different sizes. And then the size effects of mechanical properties and their dispersions are determined. By analyzing the deformation characteristics and macro-microscopic damage features of different sizes specimens, the intrinsic mechanism of the size effect on the mechanical properties of kraft paper is revealed. Finally, a size effect model of mechanical properties for kraft paper is established. The study finds that the nominal tensile strength and nominal peak strain of kraft paper first increase and then decrease as the sizes increases. This is because the cut edge fibers cause the edges of the kraft paper specimens to have weaker stress and strain capabilities, and the proportion of weakened edges in small-sized specimens is relatively large, leading to an increasing size effect on the nominal tensile strength and nominal peak strain. In large-sized specimens, the proportion of weakened edges can be ignored, and the internal fracture process zone plays a dominant role, leading to a decreasing size effect on the nominal tensile strength and nominal peak strain. The established edge-internal fracture process zone size effect model can well describe the size effect on the nominal tensile strength and nominal peak strain of kraft paper. However, this model cannot capture the nonlinear characteristics of the increasing size effect stage for the nominal tensile strength and nominal peak strain.

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张慧梅,朱峰波,刘小宇,等. 纸力学特性尺寸效应及其理论模型[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-05-08
  • 最后修改日期:2024-06-13
  • 录用日期:2024-07-09
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