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Finite element model for the assessment of the mesh resistance to opening of fishing nets

机译：有限元模型，用于评估鱼网对网的抵抗力

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The evaluation of the mesh resistance to opening of fishing nets is an important issue in assessing the selectivity of trawls by numerical methods. Sala et al. (2007) proposed a method using a relatively expensive experimental device ensuring the 2D deformation of net sample. De la Prada and Gonzales (2015) proposed a simple uni-axial experimental set-up, which stretches a sample in the transverse direction of the meshes while leaving free its deformation in the normal direction. Both authors (Sala and De la Prada) assumed that the deformation is uniform in the sample. The present study aims at developing a finite element model taking into account the mesh resistance to opening of nets, allowing the simulation of non-uniform deformation. Mechanical experimental tests were performed on a range of fishing nets commonly used in trawl codends, with varied dimensions of the sample and loading. The proposed model is in good agreement with these experimental results, and it captures the heterogeneous deformation of the netting samples. Consequently, a procedure for the assessment of the mesh resistance to opening using this model and a simple non-expensive experimental setup are proposed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在用数值方法评估拖网的选择性时，评价网孔对捕鱼网的阻力是一个重要的问题。萨拉等。 （2007年）提出了一种使用相对昂贵的实验设备的方法，可确保净样品的二维变形。 De la Prada和Gonzales（2015）提出了一个简单的单轴实验装置，该装置在网格的横向拉伸样品，而在法向不变形。两位作者（Sala和De la Prada）都认为样品中的变形是均匀的。本研究旨在开发一种考虑网格对网的开放的阻力的有限元模型，从而可以模拟非均匀变形。在拖网编码鱼中常用的一系列渔网上进行了机械实验测试，样本和负载的尺寸各不相同。所提出的模型与这些实验结果非常吻合，并且捕获了网状样品的异质变形。因此，提出了使用该模型评估网孔抗开性的程序和简单的非昂贵实验装置。 （C）2016 Elsevier Ltd.保留所有权利。

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