Article
Engineering, Multidisciplinary
K. Saravanakumar, C. Suresh Kumar, V Arumugam
Summary: The study demonstrated that changing the interply fiber orientation can significantly enhance the interlaminar fracture toughness and delamination resistance. The diversion of crack path along the fiber orientation offers more resistance to crack propagation, leading to an increase in fracture toughness. Furthermore, the calculation of sentry function enables the evaluation of delamination resistance.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Mechanics
Kaixin Xia, Yu Gong, Tiancheng Cao, Libin Zhao, Ning Hu
Summary: A semi-analytical method is proposed to determine the mixed-mode fracture resistance curve (R-curve) and mode mixture of ADCB composite laminates. The method considers the use of the equivalent crack length related to compliance and proposes a global crack growth rate ratio correction model. The effectiveness and wide applicability of the proposed method are verified through comparison with other theoretical methods, demonstrating its accuracy and ability to require fewer measurement data.
COMPOSITE STRUCTURES
(2023)
Article
Chemistry, Physical
Wei Li, Yinghonglin Liu, Peng Jiang, Fuping Guo, Jiahao Cheng
Summary: This study investigated the mechanism of delamination damage in the double cantilever beam standard test by using the strain energy release rate and acoustic emission (AE) technique. The damage mechanism of composite multidirectional laminates was studied at multiple scales and it was found that the AE parameters can effectively characterize the initiation of delamination damage.
Article
Engineering, Multidisciplinary
L. Carreras, B. L. V. Bak, S. M. Jensen, C. Lequesne, H. Xiong, E. Lindgaard
Summary: Adopting effective numerical tools can reduce design, certification, and maintenance costs by predicting damage effects on structures accurately. However, the validation of tools for assessing progressive delamination under high-cycle fatigue is insufficient, as they are rarely tested on realistic benchmark specimens. This study presents a benchmark test on a real wind energy industry specimen, demonstrating varying crack growth rates and front shape, which are more representative of in-service structures. The test is also simulated using a commercially available tool based on a cohesive zone model approach, which can replicate the experimental results regarding crack front evolution and location.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Composites
Yu Gong, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: This paper examines the effects of complex failure mechanisms on the flexural modulus of multidirectional laminates and proposes an improved data reduction method to accurately characterize fracture toughness and develop standard test procedures for mixed-mode delamination.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Yu Gong, Hexiang Zhang, Linfei Jiang, Zhaohu Ding, Ning Hu
Summary: This study proposes a semi-analytical approach to accurately determine the fracture toughness and bridging law for composite structural design. The approach shows good agreement with test results and is applicable for engineering application. It eliminates the need for specific equipment and tedious measurements, making it simple and efficient.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Acoustics
Ning Pei, Yanxun Xiang
Summary: A torsional experiment was conducted to investigate the effect of pre-delamination on the damage behavior of carbon/glass fiber-reinforced hybrid composite specimens with different off-axis angles. The results showed that the off-axis angle can enhance the toughness of the composite specimen during torsion and provide certain protection against pre-delamination damage. The location of delamination had minimal influence on the failure torque for specimens with an off-axial structure, while for specimens without an off-axis angle, the inner location of delamination led to greater reduction in failure torque. Micro-CT, SEM, and AE analysis confirmed the findings and provided insights for composite design and Structural Health Monitoring (SHM) during component service.
Article
Engineering, Mechanical
Amin Ekhtiyari, Rene Alderliesten, Mahmood M. Shokrieh
Summary: The study investigated the loading rate dependency of mode I delamination growth in CFRPs, finding a clear decrease in propagation fracture toughness and average SERR at high loading rates. The reduced fracture resistance at elevated rates was physically explained in correlation with fiber bridging, fiber breakage, and matrix cleavage observed in fracture surfaces via scanning electron microscopy.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Manufacturing
Congzhe Wang, Anastasios P. Vassilopoulos, Thomas Keller
Summary: In this study, the 2D delamination growth in composite laminates under the Mode-II fracture condition was experimentally investigated using a novel set-up. The delamination process in 2D experiments was divided into three stages: crack initiation, slow propagation, and subsequent rapid propagation. Compared to 1D experiments, the load continued to increase in 2D cases even after rapid crack propagation due to the increasing crack-front length. A longer fracture process zone, including large-scale fiber bridging, was observed in 2D specimens compared to 1D specimens under post-inspection with a digital microscope.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
S. M. Jensen, B. L. V. Bak, J. J. Bender, L. Carreras, E. Lindgaard
Summary: This study investigates delamination growth in glass fibre-reinforced polymer laminates subjected to variable amplitude loading, finding that load amplitude changes can significantly increase fatigue crack growth rate, especially with periodic repeated load amplitude changes.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Characterization & Testing
Saravanakumar Kannivel, Arumugam Vellayaraj, Ismailzabeeullah Kolimi, Janietha Thomas
Summary: This research investigates the effect of thickness on the quasi-static indentation and tensile loading behavior of glass/epoxy laminates. Different process pressures lead to variations in mechanical performance of laminates. Thinner laminates exhibit higher damage onset load and contact stiffness, while thicker laminates are more prone to severe delamination during testing.
NONDESTRUCTIVE TESTING AND EVALUATION
(2021)
Article
Mechanics
Yu Gong, Dingli Tian, Tiancheng Cao, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: In this study, a novel delamination growth criterion considering the significant R-curve effects was proposed for mixed-mode I/II delamination predictions. Its adequacy and accuracy were validated by experimental data for two different composite materials. The proposed criterion is easy to use with only two experimentally obtained parameters.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Claudia Barile, Caterina Casavola, Giovanni Pappalettera, Vimalathithan Paramsamy Kannan
Summary: Signal-based acoustic emission data were analyzed in this research to identify damage modes in CFRP composites. Novel methodologies were introduced, and the 'dmey' wavelet was chosen for damage process identification through WPT, which showed consistent results with shifting in spectral density for characterizing damage modes.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Mechanics
Chaoqi Liu, Yu Gong, Youkun Gong, Wangchang Li, Zhanfang Liu, Ning Hu
Summary: Shear-dominated delamination is a common type of damage in composite laminates. Understanding the fatigue delamination growth (FDG) behavior in mode II is crucial for damage tolerance design. This study investigates the FDG behavior of multidirectional laminates, considering the effects of fiber bridging and stress ratio. A FDG model is proposed to characterize these combined effects, and the proposed model is validated by experimental data and previous literature results.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Metallurgy & Metallurgical Engineering
T. G. Sreekanth, M. Senthilkumar, S. Manikanta Reddy
Summary: Delamination is a common and important damage in composite structures, which can lead to component failure under cyclic loading. Utilizing artificial neural network for fatigue life prediction in composites with delaminations shows high accuracy. Experimental fatigue data was used to train and test the neural network, resulting in reasonably good fatigue life prediction for delaminated composites.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Engineering, Multidisciplinary
Suresh Kumar Chelliah, Pabitha Parameswaran, Sengottuvelusamy Ramasamy, Arumugam Vellayaraj, Srinivasan Subramanian
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2019)
Article
Materials Science, Characterization & Testing
C. Suresh Kumar, V. Arumugam, Jack J. Kenned, R. Karthikeyan, A. R. Jac Fredo
NONDESTRUCTIVE TESTING AND EVALUATION
(2020)
Article
Materials Science, Characterization & Testing
Saravanakumar Kannivel, Arumugam Vellayaraj, Ismailzabeeullah Kolimi, Janietha Thomas
Summary: This research investigates the effect of thickness on the quasi-static indentation and tensile loading behavior of glass/epoxy laminates. Different process pressures lead to variations in mechanical performance of laminates. Thinner laminates exhibit higher damage onset load and contact stiffness, while thicker laminates are more prone to severe delamination during testing.
NONDESTRUCTIVE TESTING AND EVALUATION
(2021)
Article
Materials Science, Composites
A. Jayababu, V. Arumugam, B. Rajesh, C. Suresh Kumar
JOURNAL OF COMPOSITE MATERIALS
(2020)
Article
Biochemistry & Molecular Biology
J. Jefferson Andrew, Vellayaraj Arumugam, Hom N. Dhakal
Article
Engineering, Multidisciplinary
K. Saravanakumar, C. Suresh Kumar, V Arumugam
Summary: The study demonstrated that changing the interply fiber orientation can significantly enhance the interlaminar fracture toughness and delamination resistance. The diversion of crack path along the fiber orientation offers more resistance to crack propagation, leading to an increase in fracture toughness. Furthermore, the calculation of sentry function enables the evaluation of delamination resistance.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Materials Science, Textiles
Veerakumar Arumugam, Andrey Lunchev, Yingsi Wu, Alfred Iing Yoong Tok, Vitali Lipik
Summary: This study developed a knitted fabric using conductive staple spun yarn and investigated its thermal, optical, electrical properties, hydrophobic behavior, and mechanical stiffness. The results demonstrated that the fabric containing polypyrrole had lower transmission and reflection percentages compared to the fabric without polypyrrole. The thermal properties, hydrophobicity, and electrical conductivity of the fabric were significantly increased with an increasing amount of polypyrrole coated cotton fibers. The fabric with higher polypyrrole content exhibited higher electrical conductivity and water contact angle. Furthermore, the stiffness of the fabric increased with an increase in polypyrrole coated cotton fibers.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Characterization & Testing
K. Shruthi, K. Saravanakumar, V. Arumugam, C. Suresh Kumar
Summary: The study found that Type III and Type IV samples exhibited higher peak force compared to Type II and Type V samples by an average of 37%. Additionally, Type III and Type IV samples showed higher contact stiffness by 3.77 and 2.74 times than Type II samples. Furthermore, Type III and Type IV samples indicated higher damage onset load by an average of 80% compared to Type II samples. Overall, Type III samples demonstrated superior indentation performance with higher peak load and minor residual dent, while Type IV samples showed better resistance for lower indentation depths.
NONDESTRUCTIVE TESTING AND EVALUATION
(2021)
Article
Engineering, Chemical
N. Ramasamy, V Arumugam, Suresh C. Kumar
Summary: The study found that 15% phosphoric acid with 1 hour of Epichlorohydrin treatment significantly improved the adhesion properties of Kevlar/epoxy composites, reducing fracture and delamination failures.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
N. Ramasamy, V Arumugam, Suresh C. Kumar
Summary: The research focuses on improving interfacial adhesion in aramid/epoxy composites through various chemical treatments of aramid fiber surfaces. The treated fibers showed significantly higher ILSS and IFSS compared to untreated fibers, as well as higher single fiber tensile strength. This study highlights the importance of surface modification in enhancing the mechanical properties of aramid fibers in composites.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Characterization & Testing
A. Jayababu, V Arumugam, B. Rajesh, C. Suresh Kumar
Summary: This study experimentally investigated the indentation damage resistance of glass/epoxy composite laminates with different stacking sequences under cyclic loading on normal and oblique planes. The results showed that cross-ply laminates exhibited superior indentation damage resistance, while unidirectional laminates demonstrated better reduction in residual compressive strength.
MATERIALS EVALUATION
(2021)
Article
Materials Science, Multidisciplinary
Kannivel Saravanakumar, Vellayaraj Arumugam, Rotte Souhith, Carlo Santulli
Proceedings Paper
Materials Science, Multidisciplinary
N. Muralidhar, K. Vadivuchezhian, V. Arumugam, I. Srinivasula Reddy
MATERIALS TODAY-PROCEEDINGS
(2020)
Article
Engineering, Mechanical
N. Muralidhar, Vadivuchezhian Kaliveeran, V Arumugam, I. Srinivasula Reddy
ARCHIVE OF MECHANICAL ENGINEERING
(2020)
Article
Materials Science, Composites
Saravanakumar Kannivel, Harini Subramanian, Vellayaraj Arumugam, Hom N. Dhakal
JOURNAL OF COMPOSITES SCIENCE
(2020)