Article
Engineering, Mechanical
Thais Peres Zanetine Marques, Sergio Mayer, Geraldo Mauricio Candido, Mirabel Cerqueira Rezende
Summary: This study presents the main fractographic aspects and failure modes involved in the fracture of scarf repaired laminates through scanning electron microscopy (SEM) analysis, showing the effectiveness of the joining mechanism and the complexity of crack propagation in woven fabric composite materials. The good mechanical behavior of the repaired laminates is attributed to the high interfacial shear strength of the scarf joint and the overall quality of the repair manufacturing process.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
C. Sun, W. Zhao, J. Zhou, M. Altenaiji, W. J. Cantwell, Q. Y. Wang, Z. W. Guan
Summary: An innovative stitch-reinforced scarf patch repair technique was developed in this study to increase the residual strength of damaged composite structures. By investigating the effects of different parameters on the repair process, a certain optimization effect was achieved.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Jamshid Fazilati, Vahid Khalafi
Summary: Bonded repair techniques are commonly used in aviation maintenance, with Isogeometric Analysis offering a cost-effective tool for analyzing complex geometries. The study focuses on free vibration analysis of perforated plates repaired with bonded composite patches, using a multi-patch geometry modeling approach and ensuring geometry integrity through a Nitsche method. Results show the influence of geometric and material parameters on the dynamic response of repaired perforated plates.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Mechanics
Fujian Zhuang, Albertino Arteiro, Rodrigo P. Tavares, Pedro P. Camanho, Puhui Chen
Summary: This paper presents the development and validation of a mesoscale numerical model to predict the bearing failure of composite laminates reinforced by unidirectional continuous fibers, focusing on specimens that show a significant non-linear response prior to failure. Thorough analyses and comparisons of the experimental and numerical results show a good correlation of the bearing strengths and overall deformation, as well as good agreement in terms of damage size and damage shape. Relevant limitations include difficulties in predicting the post-peak plateau stresses and the loading displacements in some configurations, setting the stage for additional future research.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
Beyza Naz Karaduman, Faruk Elaldi
Summary: This study investigated the effects of different repair methods and scarf angles on the mechanical performance of composite materials. The results showed that the specimens repaired at 20 degrees had the highest strength. In addition, it was determined that the samples repaired with double scarf withstand higher forces compared to the samples repaired with single scarf at the same angle.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Engineering, Manufacturing
Miguel Ubago Torres, Meisam Jalalvand
Summary: In this study, an additive laminate was proposed to stop the development of delamination in composite laminates. Numerical analyses and experimental results showed that this technique can successfully suppress free-edge delamination and improve the mechanical performance of laminates.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Longying Yang, Yongzhong Yang, Simin He, Guiyong Chen, Chenghong Ao, Wei Zhang
Summary: The repair angle significantly influences the bending strength recovery of scarf patch repaired composites, with an optimal repair angle technical parameter of 30:1 achieving up to 99.6% bending strength recovery. The simulation model accurately predicts the failure load of repaired honeycomb sandwich composites with different repair angles, with a maximum error of 4.99% and further optimization reducing the error to 4.49%. This model can effectively reduce the need for repeated experiments, optimize repair angles, and maximize the recovery of composite materials' initial performance.
PLASTICS RUBBER AND COMPOSITES
(2021)
Article
Mechanics
Jian Deng, Pu Xue, Qiao Zhi Yin, Tian Jian Liu, Xin Wei Wang
Summary: In this study, a three-dimensional damage analysis framework based on the finite element method was proposed to predict the damage evolution and load-bearing capacity of fiber-reinforced composites. The framework accounted for stress interaction, coupling effect, and addressed the issue of finite element mesh dependency.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Goran Vukelic, Goran Vizentin
Summary: This study investigated the failure of two steel pressure vessels during hydrostatic test at a pressure lower than test pressure. It was found that pitting corrosion at the bottom part of the vessel was the cause of cracks, and the possibility of retaining functionality using composite patch repair procedure was assessed and confirmed by experimental investigation. Recommendations were provided to prevent future failures of similar pressure vessels.
THIN-WALLED STRUCTURES
(2021)
Article
Polymer Science
Sridharan Vijay Shankar, Sridhar Idapalapati
Summary: This experimental study examines the impact response restoration of scarf-patched GFRP composite laminates with different scarf geometries. Circular and rounded rectangular scarf patch configurations were used for repairs. Experimental results showed that the force and energy response of the repaired specimens were similar to that of the pristine specimen. The predominant failure modes were observed only in the repair patches, with no discontinuity in the adhesive interface.
Article
Engineering, Mechanical
P. F. Liu, J. W. Liu
Summary: This paper investigates the damage mechanisms of composite scarf adhesive joints with brittle adhesive material and explores the competitive relationships between the damage behaviors of the adhesive layer and interface debonding. The study develops damage initiation criteria and damage evolution laws for the epoxy adhesive layer. Finite element analysis is performed to study the two competitive damage mechanisms of the adhesive joints. The results show that the damage features of the adhesive layer become more important as the thickness increases beyond 1.0 mm.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Ahmed Asiliskender, Joaquim Peiro, Koon-Yang Lee, Apostolos Parlamas, Brian Falzon, Zafer Kazanci
Summary: The proposed two-dimensional reconstruction, simulation, and injection strategy for resin injection repair offers a viable and quantitative alternative to existing intuition-based practices. Its accuracy has been verified through validation results.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Marine
Mohamed Hussain, Yehia Abdel-Nasser, Adel Banawan, Yasser M. Ahmed
Summary: This research thoroughly investigated the structural integrity of composite blades under various operating conditions using CFD and FEM, identifying interlaminar normal stress failure as the most critical mode of failure. A solid model is recommended, meeting the requirements of BV rules when assessed by Hoffman criteria under design conditions.
Article
Engineering, Manufacturing
D. Srinivasan, S. Ravisankar Padma, S. Idapalapati
Summary: Scarf joints are commonly used in aerospace composite repairs due to their improved strength, surface quality, and distribution of shear and peel stress. However, shallow scarf angle repairs require removing a significant amount of parent material, increasing cost and complexity. This study compared different repair designs and found that higher scarf angles can be replaced with Ti-6Al-4V straps for better repair efficacy.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
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)
