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Geometrical and material optimisation of deformed steel fibres: Spirally deformed fibres

机译：变形钢纤维的几何和材料优化：螺旋变形纤维

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This paper presents an optimisation procedure of geometrical and material properties of steel fibres using the validated three-dimensional nonlinear Finite Element (FE) pullout model previously proposed by the authors. The FE model is employed as a virtual laboratory unit to investigate the pullout performance of steel fibres with various shapes such as hooked-end and spirally deformed steel fibres. The preliminary FE pullout analyses imply that the optimisation of the fibre with spiral configuration (adjustment of geometrical and material properties of the fibre) could result in an efficient high-performing steel fibre; hence such a fibre is selected for the optimisation procedure. In order to re-validate the numerical pullout model and further adjust its nonlinear parameters for enhancing the simulations prediction, a set of experimental pullout tests are conducted on four spirally deformed steel fibres with different geometrical properties. Extensive parametric studies are performed on the material and geometrical properties of the fibre to examine their effects on the fibre pullout performance. Moreover, an empirical equation is proposed for the estimation of fibre efficiency and optimum design of spirally deformed steel fibres in which geometrical and material properties are taken into account.
机译：本文使用作者先前提出的经过验证的三维非线性有限元（FE）拉拔模型，提出了钢纤维的几何和材料特性的优化程序。 FE模型用作虚拟实验室单元，以研究各种形状的钢纤维（如钩形末端和螺旋形变形的钢纤维）的拔出性能。初步的有限元分析表明，优化螺旋结构的纤维（调整纤维的几何和材料性能）可以产生高效的高性能钢纤维。因此，选择这种光纤进行优化程序。为了重新验证数值拉拔模型并进一步调整其非线性参数以增强模拟预测，对四种具有不同几何特性的螺旋变形钢纤维进行了一组实验拉拔测试。对纤维的材料和几何特性进行了广泛的参数研究，以检查它们对纤维拔出性能的影响。此外，提出了一个经验方程式，用于在考虑几何和材料特性的情况下估算螺旋变形钢纤维的纤维效率和优化设计。

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