用离散元方法模拟具有双峰和伪全粒径分布的涂层力学性能

IF 0.6 4区 农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD Tappi Journal Pub Date : 2023-08-01 DOI:10.32964/tj22.7.491
Dan Varney, M. Toivakka, D. Bousfield
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引用次数: 0

摘要

纸张涂层的机械性能在压延、印刷和折叠等转换操作中很重要。虽然一些实验和理论研究提高了我们对这些系统的认识,但对褶皱处的裂纹等问题缺乏粒子级的理解。离散元法(DEM)模型用于描述涂层的弯曲和拉伸变形。模型中的颗粒是球形颗粒的双峰分布或伪全粒径分布。报道了颗粒尺寸分布对涂层预测力学性能的影响。模型的输入包括粘合剂膜的性质和粘合剂浓度。该模型预测了作为这些参数函数的裂纹形成,还计算了模量、最大应力和失效应变。将模拟结果与以往的实验结果进行了比较。在一定范围的乳胶淀粉比例和不同的粘合剂浓度下,对拉伸和弯曲都得到了合理的预测。报道了颗粒堆积密度对力学性能的影响。
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A discrete element method to model coating layer mechanical properties with bimodal and pseudo-full particle size distributions
The mechanical properties of paper coating layers are important in converting operations such as calendering, printing, and folding. While several experimental and theoretical studies have advanced our knowledge of these systems, a particle level understanding of issues like crack-at-the-fold are lacking. A discrete element method (DEM) model is used to describe bending and tension deformations of a coating layer. The particles in the model are either bimodal distributions or pseudo-full particle size distributions of spherical particles. The impact of particle size distribution on the predicted mechanical properties of the coating layer is reported. Inputs to the model include properties of the binder film and the binder concentration. The model predicts crack formation as a function of these parameters and also calculates the modulus, the maximum stress, and the strain-to-failure. The simulation results are compared to previous experimental results. Reasonable predictions were obtained for both tensile and bending for a range of latex-starch ratios and at various binder concentrations. The influence of particle packing density on mechanical properties is reported.
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来源期刊
Tappi Journal
Tappi Journal 工程技术-材料科学:纸与木材
CiteScore
1.30
自引率
16.70%
发文量
59
审稿时长
6-12 weeks
期刊介绍: An internationally recognized technical publication for over 60 years, TAPPI Journal (TJ) publishes the latest and most relevant research on the forest products and related industries. A stringent peer-review process and distinguished editorial board of academic and industry experts set TAPPI Journal apart as a reliable source for impactful basic and applied research and technical reviews. Available at no charge to TAPPI members, each issue of TAPPI Journal features research in pulp, paper, packaging, tissue, nonwovens, converting, bioenergy, nanotechnology or other innovative cellulosic-based products and technologies. Publishing in TAPPI Journal delivers your research to a global audience of colleagues, peers and employers.
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