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首页> 外文期刊>Journal of Spacecraft and Rockets >Tearing of Thin Polymer Sheets with Wrinkling
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Tearing of Thin Polymer Sheets with Wrinkling

机译：薄聚合物片的起皱撕裂

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摘要

In this paper, the tearing behavior of thin polymer sheets was studied experimentally and numerically. First, the specific essential work of fracture for thin biaxially oriented polyethylene terephthalate (Mylar) was measured experimentally. Double-edged notched tensile specimens of Mylar with three different thicknesses and varying ligament lengths were tested. Load-displacement graphs were formed, and the total internal energy was evaluated, from which the specific fracture energy was determined. Next, a finite element analysis was performed to predict the tearing response of polymer sheets. The finite element model incorporated a user-defined cohesive element to properly represent the structural behavior of a thin polymer sheet in the presence of damage, including the propensity of the sheet to wrinkle. The results indicated that the measured specific essential work-of-fracture values were nearly identical for the three separate thicknesses, which confirmed that it is indeed a material property of the Mylar itself. The developed user cohesive element accurately simulated the tearing of thin polymer sheets, producing well-matched nominal stress-strain curves to those by experiments. Analyses were also performed for the double-edged notched tensile configuration with different lengths and a corner-loaded square sheet configuration with a center cut, which showed that the wrinkle deformation significantly affected the tearing behavior of thin polymer sheets.
机译：本文对聚合物薄板的撕裂行为进行了实验和数值研究。首先，通过实验测量了薄双轴取向聚对苯二甲酸乙二醇酯（聚酯薄膜）的断裂的特定基本功。测试了具有三种不同厚度和不同韧带长度的聚酯薄膜双刃缺口拉伸试样。形成载荷-位移图，并评估总内部能量，由此确定比断裂能。接下来，进行有限元分析以预测聚合物片的撕裂响应。有限元模型结合了用户定义的内聚性元素，可以正确表示聚合物薄板在存在损坏（包括薄板起皱的倾向）时的结构行为。结果表明，对于三个单独的厚度，测得的特定基本断裂功值几乎相同，这证实这确实是Mylar本身的材料特性。开发的用户粘性元件可以精确地模拟聚合物薄板的撕裂，从而产生与实验相匹配的标称应力-应变曲线。还对具有不同长度的双刃缺口拉伸构型和具有中心切口的角加载方形片构型进行了分析，结果表明，皱纹变形显着影响了聚合物薄片的撕裂行为。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2015年第6期|1680-1690|共11页
  • 作者

    Woo Kyeongsik; Zignego Donald L.; Jenkins Christopher H.;

  • 作者单位

    Chungbuk Natl Univ, Cheongju 361763, South Korea;

    Montana State Univ, Dept Mech & Ind Engn, Bozeman, MT 59717 USA;

    Montana State Univ, Dept Mech & Ind Engn, Bozeman, MT 59717 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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