A multiscale approach for fatigue life prediction of polymer matrix composite laminates

Sayyidmousavi, Alireza; Bougherara, Habiba

doi:10.1177/0731684415588936

Cited by 8 publications

(6 citation statements)

References 39 publications

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“…Matrix microcracking may occur under static loading 1,2 and fatigue loading. [3][4][5][6][7][8][9][10] There are multiple approaches to model the matrix micro-cracking initiation and propagation. One approach is progressive damage modelling based on comparing stresses with the corresponding residual strength of the lamina.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical prediction of damage due to transverse ply cracking under fatigue loading in composite laminates

Mohammadi

Rohanifar

Salimi-Majd

et al. 2017

Journal of Reinforced Plastics and Composites

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To predict the matrix microcracking of laminated composites under fatigue loading, a novel energy based model is presented in the framework of micromechanics. For this purpose, strain energy release rate (SERR) of microcracks which had been derived previously for the whole laminate, is developed for a lamina, and then is calculated using a stress transfer-based stiffness reduction method. The advantages of the proposed method include its capability to predict the matrix cracking of general lay-ups based on the local stresses and stiffnesses of each plies separately and not being limited to a special stacking sequence. In order to predict micro-cracking propagation of composites under cyclic loading, the coefficients of the modified Paris law are extracted using the available experimental data of crack density–cycle curves. Then using multi-scale modelling and continuum damage mechanics concept, the proposed algorithm is implemented in ANSYS finite element software, as a new user defined material (Usermat). The static progress of failure on [45/−45]s laminate is simulated and the obtained results are compared with the existing experimental data in a good agreement. Finally, the results of implemented fatigue algorithm for different cross-ply laminates under different stress levels are obtained and compared with the available experimental data.

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Section: Introductionmentioning

confidence: 99%

Micromechanical prediction of damage due to transverse ply cracking under fatigue loading in composite laminates

Mohammadi

Rohanifar

Salimi-Majd

et al. 2017

Journal of Reinforced Plastics and Composites

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“…Then 64 groups of MD simulation parameters can be obtained by linking with 16 groups of FEM conditions. The maximum values of SED in roll nip of number 175 mesh are extracted to import the microsystem by using energy transfer model in (13), (14), and Figure 8. It explains specifically that the energy of microsystem is converted into pressure, and then the pressure can be imported to x, y, and z directions by using the system pressurization method (Figure 9), and roller pressure (i.e., compaction force) is exerted to the z direction simultaneously.…”

Section: Microsystem and Its Boundary Conditionsmentioning

confidence: 99%

“…However, the multiscale material damage still remains a compelling challenge until now [6][7][8][9][10]. Although much research has been done on the defects of composites during service life [11][12][13], little work has been done on the evolution mechanism of multiscale defects in AFP process.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Collaborative Optimization of Processing Parameters for Carbon Fiber/Epoxy Laminates Fabricated by High-Speed Automated Fiber Placement

Han

Sun

Shao

et al. 2016

Advances in Materials Science and Engineering

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Processing optimization is an important means to inhibit manufacturing defects efficiently. However, processing optimization used by experiments or macroscopic theories in high-speed automated fiber placement (AFP) suffers from some restrictions, because multiscale effect of laying tows and their manufacturing defects could not be considered. In this paper, processing parameters, including compaction force, laying speed, and preheating temperature, are optimized by multiscale collaborative optimization in AFP process. Firstly, rational model between cracks and strain energy is revealed in order that the formative possibility of cracks could be assessed by using strain energy or its density. Following that, an antisequential hierarchical multiscale collaborative optimization method is presented to resolve multiscale effect of structure and mechanical properties for laying tows or cracks in high-speed automated fiber placement process. According to the above method and taking carbon fiber/epoxy tow as an example, multiscale mechanical properties of laying tow under different processing parameters are investigated through simulation, which includes recoverable strain energy (ALLSE) of macroscale, strain energy density (SED) of mesoscale, and interface absorbability and matrix fluidity of microscale. Finally, response surface method (RSM) is used to optimize the processing parameters. Two groups of processing parameters, which have higher desirability, are obtained to achieve the purpose of multiscale collaborative optimization.

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“…They developed a non-linear cumulative model to take into account three different damage failures; fiber breakage, elastoplastic damage under shear and transverse tension stress. Also, Sayyidmousavi et al 12 recently introduced a progressive fatigue damage model within a multi-scale framework to model failure in UD and multidirectional laminates using a finite element program. Li et al 13 extended theory of micro-mechanics of failure to analyze fatigue progressive of failure and predict strength of bolted joint in composite structures.…”

Section: Introductionmentioning

confidence: 99%

A progressive multi-scale fatigue model for life prediction of laminated composites

Kordkheili

Toozandehjani

Soltani

2017

Journal of Composite Materials

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This article presents a multi-scale progressive micro-mechanical fatigue model. The model employs fundamental equation of the kinetic theory of fracture to calculate damage parameters of both fiber and matrix during cyclic loading. In order to adapt the equation, required material coefficients of the constituents can be achieved from fatigue test results of longitudinal and transverse unidirectional composites, only. Sharing stress capacities of fiber and matrix are determined using a modified progressive micro-mechanical bridging model in the presence of damage. The damage parameters in the constituents are calculated employing two different equivalent scalars. However, during sinusoidal load application, these damage parameters are also updated using a first kind Bessel function of amplitude stresses in the constituents as well as their material coefficients. The enhanced formulation is then implemented into the commercial finite element software of ABAQUS via a developed user material (UMAT) subroutine utilizing a suitable failure criteria and an own solution algorithm. Advantages of the proposed model are assessed and comparisons with available solutions are presented.

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A multiscale approach for fatigue life prediction of polymer matrix composite laminates

Cited by 8 publications

References 39 publications

Micromechanical prediction of damage due to transverse ply cracking under fatigue loading in composite laminates

Micromechanical prediction of damage due to transverse ply cracking under fatigue loading in composite laminates

Multiscale Collaborative Optimization of Processing Parameters for Carbon Fiber/Epoxy Laminates Fabricated by High-Speed Automated Fiber Placement

A progressive multi-scale fatigue model for life prediction of laminated composites

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