The Effect of Notches on the Failure of Two-Dimensional Nonwoven Fiber Networks

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2021-04-01 DOI:10.1115/1.4048282
Yinglong Chen, T. Siegmund
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Abstract

The tearing response of sheets of nonwoven fiber material is investigated. It addresses the question on how notch length and notch geometry is related to the tearing strength and tearing processes. The system considered consists of elastic-brittle fibers connected by strong interfiber bonds. Fiber fracture is the only failure mechanism. For a random fiber orientation case, deformation of the unnotched specimen occurs by long-range fiber chains connecting the load inducing boundaries, and failure is by tearing the cross section. The strength of the notched random fiber sheets is well described by a net section criterion, independent of the notch geometry. For a fiber orientation with symmetry relative to the loading direction, tensile loading is transferred by formation of the X-shaped fiber chains centered in the specimen. The subsequent failure occurs along the fiber chain by shear. Thus, the tearing strength is independent of the notch depth in double-edge notched and single-edge notched specimens, when the presence of shallow notch does not disrupt the force chains in the model. As the notch disturbs the fiber chains, alternative shear failure path forms near the notch tip, leading to a dependence of failure strength on the notch geometry. Then, the failure strength of notched nonwoven networks is described by a shear strength and a notch geometry term.
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缺口对二维非织造纤维网络失效的影响
研究了非织造纤维片材的撕裂响应。它解决了缺口长度和缺口几何形状如何与撕裂强度和撕裂过程相关的问题。所考虑的系统由强纤维间键连接的弹脆纤维组成。纤维断裂是唯一的破坏机制。对于随机纤维取向的情况,无缺口试样的变形是由连接载荷诱导边界的长纤维链引起的,破坏是由撕裂截面引起的。有缺口的随机纤维片的强度可以用一个独立于缺口几何形状的网截面标准很好地描述。对于相对于加载方向对称的纤维取向,拉伸载荷通过形成以试样为中心的x形纤维链来传递。随后沿纤维链发生剪切破坏。因此,当浅缺口的存在不破坏模型中的力链时,双边缘缺口和单边缘缺口试件的撕裂强度与缺口深度无关。由于缺口扰乱了纤维链,在缺口尖端附近形成了可选择的剪切破坏路径,导致破坏强度依赖于缺口几何形状。然后,用剪切强度和缺口几何项来描述缺口非织造网的破坏强度。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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