Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions

Ferreira, Rafael Thiago Luiz; Ashcroft, Ian

doi:10.1007/s00158-019-02462-w

Cited by 19 publications

(4 citation statements)

References 79 publications

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“…Therefore, the failure criterion for quasi-static analysis can be used in dynamic impact analysis. In this paper, the 3D Hashin criterion is used as the failure criterion [26][27][28][29]. The corresponding failure mode is as follows:…”

Section: Intralaminar Damagementioning

confidence: 99%

Simulations and Tests of Composite Marine Structures Under Low-Velocity Impact

Zhu

Chen

et al. 2021

Polish Maritime Research

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Due to their excellent performance, composite materials are increasingly used in the marine field. It is of great importance to study the low-velocity impact performance of composite laminates to ensure the operational safety of composite ship structures. Herein, low-velocity drop-weight impact tests were carried out on 12 types of GRP laminates with different layup forms. The impact-induced mechanical response characteristics of the GRP laminates were obtained. Based on the damage model and stiffness degradation criterion of the composite laminates, a low-velocity impact simulation model was proposed by writing a VUMAT subroutine and using the 3D Hashin failure criterion and the cohesive zone model. The fibre failure, matrix failure and interlaminar failure of the composite structures could be determined by this model. The predicted mechanical behaviours of the composite laminates with different layup forms were verified through comparisons with the impact test results, which revealed that the simulation model can well characterise the low-velocity impact process of the composite laminates. According to the damage morphologies of the impact and back sides, the influence of the different layup forms on the low-velocity impact damage of the GRP laminates was summarised. The layup form had great effects on the damage of the composite laminates. Especially, the outer 2‒3 layers play a major role in the damage of the impact and the back side. For the same impact energy, the damage areas are larger for the back side than for the impact side, and there is a corresponding layup form to minimise the damage area. Through analyses of the time response relationships of impact force, impactor displacement, rebound velocity and absorbed energy, a better layup form of GRP laminates was obtained. Among the 12 plates, the maximum impact force, absorbed energy and damage area of the plate P4 are the smallest, and it has better impact resistance than the others, and can be more in line with the requirements of composite ships. It is beneficial to study the low-velocity impact performance of composite ship structures.

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Section: Intralaminar Damagementioning

confidence: 99%

Simulations and Tests of Composite Marine Structures Under Low-Velocity Impact

Zhu

Chen

et al. 2021

Polish Maritime Research

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“…However, the presence of stress concentrators in laminates leads to the appearance of gradient stress fields, which significantly reduces the efficiency of the laminates. To improve stiffness and strength of laminates, curved reinforcement is used [1][2][3][4][5][6][7]. Due to variable fiber orientations in the laminate layer, it is possible to locally vary the stiffness of the layer and adapt it to stresses.…”

Section: Introductionmentioning

confidence: 99%

Influence of Curved Fibers on the Mechanical Behavior of Variable Stiffness Composites

Malakhov

2022

KEM

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Composite materials are widely used in various industries due to their high specific characteristics. The most common composites are laminates, which consist of multidirectional layers with unidirectional fibers adapted to stresses of the laminates. However, the efficiency of such structures is significantly reduced when there are stress concentrators. One of the ways to increase the efficiency of composite structures with stress concentrators is to change the reinforcement structure and use the transition from unidirectional fibers to curvilinear fibers, which could be adapted to both the geometry and the loads of the composite structures. This short review describes the various methods by which it is possible to manufacture composite structures with curved fibers and change the reinforcement structure. Composite structures both unidirectional fibers and curved fibers made by different manufacturing technologies are considered and compared as well as the efficiency of the composites is analyzed.

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“…Structural optimization is commonly used in various fields, such as: fiber composites [4], printable structures [5], car body [6], adaptive structures [7], and especially with integration with FEM [8]. Structural optimization, in correlation with optimization variables, can be divided into topology optimization [9], shape optimization [10] and size optimization [11].…”

Section: Introductionmentioning

confidence: 99%

Development of Knowledge-Based Engineering System for Structural Size Optimization of External Fixation Device

et al. 2021

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The development process of the knowledge-based engineering (KBE) system for the structural size optimization of external fixation device is presented in this paper. The system is based on algorithms for generative modeling, finite element model (FEM) analysis, and size optimization. All these algorithms are integrated into the CAD/CAM/CAE system CATIA. The initial CAD/FEM model of external fixation device is verified using experimental verification on the real design. Experimental testing is done for axial pressure. Axial stress and displacements are measured using tensometric analysis equipment. The proximal bone segment displacements were monitored by a displacement transducer, while the loading was controlled by a force transducer. Iterative hybrid optimization algorithm is developed by integration of global algorithm, based on the simulated annealing (SA) method and a local algorithm based on the conjugate gradient (CG) method. The cost function of size optimization is the minimization of the design volume. Constrains are given in a form of clinical interfragmentary displacement constrains, at the point of fracture and maximum allowed stresses for the material of the external fixation device. Optimization variables are chosen as design parameters of the external fixation device. The optimized model of external fixation device has smaller mass, better stress distribution, and smaller interfragmentary displacement, in correlation with the initial model.

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Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions

Cited by 19 publications

References 79 publications

Simulations and Tests of Composite Marine Structures Under Low-Velocity Impact

Simulations and Tests of Composite Marine Structures Under Low-Velocity Impact

Influence of Curved Fibers on the Mechanical Behavior of Variable Stiffness Composites

Development of Knowledge-Based Engineering System for Structural Size Optimization of External Fixation Device

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