Article
Materials Science, Composites
Tobias Laux, Roy C. Bullock, Ole T. Thomsen, Janice M. Dulieu-Barton
Summary: The effect of lay-up on the open-hole shear strength of carbon fibre/epoxy composite laminates was investigated. Laminates with equivalent specific stiffness but different lay-up showed significant differences in ultimate shear strength. Digital Image Correlation, X-ray Computed Tomography, and Finite Element Analysis were used to analyze the failure modes associated with different lay-ups. The results suggest that the open-hole shear test could be used for material screening and as a benchmark for damage modelling frameworks in laminated composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Noemie Fedon, Paul M. Weaver, Alberto Pirrera, Terence Macquart
Summary: Composite materials are commonly used for designing lightweight structures due to their high specific strength and stiffness, but the anisotropy of composites can lead to complex failure mechanisms. Existing design guidelines are difficult to enforce, often requiring post-repair to meet requirements. The authors propose a deterministic repair procedure with a success rate of over 88% and fast computational speed.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Jingmeng Weng, Tong Meng, Weidong Wen, Shaodong Weng
Summary: This study focuses on the fatigue lives of composite laminates under different tension-torsion biaxial fatigue loading paths. By establishing a macro-meso model, the fatigue life of composite laminates can be predicted with numerical results showing good agreements with experimental data.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Materials Science, Characterization & Testing
Hani Yadegari, Reza Taherian, Soheil Dariushi
Summary: Composite tubes have a wide range of applications in various industries, and in this study, aluminum-composite tubes were made using Filament Winding and hand layup methods. Five samples with different stacking sequences were fabricated and characterized using SEM analysis and mechanical tests. The hybrid carbon and GF tube exhibited the highest energy absorption, with a gradual failure mechanism making it a suitable choice for industrial applications.
POLYMERS & POLYMER COMPOSITES
(2021)
Article
Engineering, Multidisciplinary
B. Vieille, A. Coppalle, L. Le Pluart, E. Schuhler, A. Chaudhary, B. Rijal, A. Alia, N. Delpouve
Summary: This study investigated the influence of a kerosene flame on the residual mechanical tensile properties of composite laminates made from carbon fibers and PEKK thermoplastic. Longer exposure times to the flame resulted in increasing damages within the laminates, leading to a degradation in bearing capabilities. In quasiisotropic (QI) laminates, two distinct damaged regions were observed, highlighting the varying effects of the flame exposure.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Textiles
Moni Sankar Mondal, Joy Sarkar, Naimul Hasan, Hasan Al Mehedi, Pial Dutta
Summary: This research explores the unique sound absorption properties of jute and coir fiber composites. The study analyzes the binding capability of epoxy resin and its ability to provide shape stability to the composites. The results of the sound absorption test show that the sound absorption coefficient varies with the percentage of fibers present, and there is a significant difference in sound absorption quality between the pure fiber composites.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Engineering, Civil
Ozkan Ozbek, Mehmet Bulut, Ahmet Erklig, Omer Yavuz Bozkurt
Summary: This study investigated the interlaminar shear strength (ILSS) of fiber-reinforced hybrid composites with double and triple fiber hybridizations, highlighting the importance of fiber location in determining ILSS and failure mechanism along the out-of-plane direction.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
J. Llobet, P. Maimi, Y. Essa, F. Martin de la Escalera
Summary: The mesoscale continuum damage model for laminated composites developed by the AMADE research group over the past 10 years has been extended for fatigue life and residual strength predictions. The model includes new functions to account for material degradation under fatigue loads and uses the cycle jump approach to reduce computational cost. Validation of the computational model was done by simulating progressive failure mechanisms of open-hole and double-edge notched specimens under various load cases in the follow-up publication.
MECHANICS OF MATERIALS
(2021)
Article
Chemistry, Physical
Kalliopi-Artemi Kalteremidou, Danny Van Hemelrijck, Lincy Pyl
Summary: This study examines the response of different carbon/epoxy laminates under fatigue through in-situ microscopic observations, evaluating the impact of multiaxiality. Findings suggest that the key to optimizing fatigue response lies in the number of off-axis layers and the advantages of unbalanced laminates.
Article
Materials Science, Multidisciplinary
J. Llobet, P. Maimi, A. Turon, B. L. Bak, E. Lindgaard, L. Carreras, Y. Essa, F. Martin de la Escalera
Summary: This paper continues the study on damage mechanisms of composite laminates under static and fatigue loads, investigating the effects of intralaminar and interlaminar damage on residual strength through experiments and numerical simulations. The results show that the main fatigue degradation mechanisms are well captured in the simulations, except for the open-hole specimen which needs further improvement.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
F. Alizadeh, R. Mazruee Sebdani, C. Guedes Soares
Summary: In this study, the residual ultimate strength of a composite laminate with delamination under in-plane compressive loading is determined numerically using the finite element method. The delamination growth is predicted and modeled using linear fracture mechanics and the virtual crack closure technique. The results show that the load-carrying capacity of the structure is reduced due to the expansion of the delaminated area. Despite its simplicity and efficiency, this method allows for the calculation and prediction of strain energy release rates at different fracture modes in the delamination region.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Vishwas Divse, Deepak Marla, Suhas S. Joshi
Summary: This study analyzed the stress concentration factor, damage progression, and tensile notched strength of glass fiber reinforced polymer (GFRP) lamina and laminates with holes using finite element models. The results showed an increase in stress concentration factor and a decrease in tensile notched strength as the D/W ratio of holes on 0 degrees GFRP lamina varied from 0.1 to 0.5. Furthermore, multi-directional laminates exhibited lower axial stiffness and tensile notched strength compared to unidirectional 0 degrees lamina due to early damage initiation in off-axis plies.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yuhao Lian, Fuqiang Wu, Yalin Han
Summary: This paper quantifies the inconsistency of mechanical uncertainty between composite mechanical test panels and components using the resampling method. It establishes a fast prediction method for structural uncertainty by introducing resampling method and 3D random field into the Monte-Carlo simulation framework. Three sets of laminate strength experiments were conducted to verify the analysis architecture, and the results showed good agreement with the experimental ones. Some intelligent algorithms regarding applications of the 3D random field are also addressed.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Bhaskara Rao Pathakokila, Ramji Koona, Rama Krishna Avasarala, Satya Devi Ambadipudi, V. Manoj Kumar Uppuluri
Summary: The fatigue behavior of composite laminates under different conditions was studied, fatigue life was determined through testing and statistical methods, and the effect of scatter on fatigue strength as well as the causes of damage were investigated.
MECHANICS OF TIME-DEPENDENT MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Z. X. Yun, D. H. Li
Summary: A thermo-mechanical progressive analysis model is proposed for predicting fatigue-driven delamination in composite laminated plates. The delamination is simulated based on extended layerwise method (XLWM), using the traction-separation law to describe the heat flux transfer and mechanical load transfer across the delamination front. A thermo-mechanical cohesive zone model (TM-CZM) is developed by Peerlings damage law to simulate the fatigue characteristic of delamination front. In the numerical examples, the effects of mesh lengths, acceleration multipliers, interface strengths, and cyclic temperature load magnitudes on the delamination expansion process are investigated, and the temperature-life curves of composite laminates are determined as well.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)