Finite element analyses on bending fatigue of three-dimesional five-directional braided composite T-beam with mixed unit-cell model

2017 ◽  
Vol 52 (9) ◽  
pp. 1139-1154 ◽  
Author(s):  
Yiwei Ouyang ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Finite Element ◽  
Cell Model ◽  
Unit Cell ◽  
Finite Element Analyses ◽  
Unit Cell Model ◽  
Joint Region ◽  
Bending Fatigue ◽  
Braided Composite ◽  
T Beam ◽  
Interior Cell

This paper reports the bending fatigue behavior of three-dimensional five-directional braided T-shaped composite from finite element analyses and experimental characterizations. The braided composite microstructure was divided into five types of unit cell models, that is, interior cell, surface cell, corner cell, interior cell in joint region, and corner cell in joint region. A user-defined material subroutine was developed to characterize the unit cells properties, damage accumulation, and failure criterion of the T-beam under different stress levels. The stiffness degradation curves and bending displacement curves were obtained from the finite element analysis to show the three stages of fatigue developments, that is, matrix cracks, interface debonding, and fiber breaking. The stress and strain concentration areas were found in the middle of the flange and the web of the T-beam composites. The high strength reinforced fibers are recommended to add in the middle of the flange and the web for improving the bending fatigue resistance. And also, we hope the mixed unit-cell model could be extended to the other braided composite structures under quasi-static or cyclic loadings.

scholarly journals Validity of Finite Element Unit Cell Model for Studying Yield Condition of Isotropic Porous Materials.

1995 ◽  
Vol 61 (591) ◽  
pp. 2435-2441
Author(s):  
Tomoyuki Sasaki ◽  
Moriaki Goya ◽  
Kiyohiro Miyagi ◽  
Shousuke Itomura ◽  
Toshiyasu Sueyoshi
Keyword(s):  
Finite Element ◽  
Porous Materials ◽  
Cell Model ◽  
Yield Condition ◽  
Unit Cell ◽  
Unit Cell Model

A Unit-Cell Model for Predicting the Elastic Constants of 3D Four Directional Cylindrical Braided Composite Shafts

2017 ◽  
Vol 25 (3) ◽  
pp. 619-633 ◽  
Author(s):  
Wenfeng Hao ◽  
Ye Liu ◽  
Xinrong Huang ◽  
Yinghua Liu ◽  
Jianguo Zhu
Keyword(s):  
Elastic Constants ◽  
Cell Model ◽  
Unit Cell ◽  
Unit Cell Model ◽  
Braided Composite

scholarly journals Thermo-Viscoelastic Response of 3D Braided Composites Based on a Novel FsMsFE Method

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 271
Author(s):  
Jun-Jun Zhai ◽  
Xiang-Xia Kong ◽  
Lu-Chen Wang
Keyword(s):  
Finite Element ◽  
Cell Model ◽  
Structural Parameters ◽  
Thermal Relaxation ◽  
Viscoelastic Behavior ◽  
Unit Cell ◽  
Time Dependent ◽  
3D Braided Composites ◽  
Equivalent Time ◽  
Representative Unit Cell

A homogenization-based five-step multi-scale finite element (FsMsFE) simulation framework is developed to describe the time-temperature-dependent viscoelastic behavior of 3D braided four-directional composites. The current analysis was performed via three-scale finite element models, the fiber/matrix (microscopic) representative unit cell (RUC) model, the yarn/matrix (mesoscopic) representative unit cell model, and the macroscopic solid model with homogeneous property. Coupling the time-temperature equivalence principle, multi-phase finite element approach, Laplace transformation and Prony series fitting technology, the character of the stress relaxation behaviors at three scales subject to variation in temperature is investigated, and the equivalent time-dependent thermal expansion coefficients (TTEC), the equivalent time-dependent thermal relaxation modulus (TTRM) under micro-scale and meso-scale were predicted. Furthermore, the impacts of temperature, structural parameters and relaxation time on the time-dependent thermo-viscoelastic properties of 3D braided four-directional composites were studied.

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