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Materials
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Multiscale Reliability Analysis of Stiffened Composites
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Multiscale Reliability Analysis of Stiffened Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 7601

Special Issue Editors

Dr. Feng Zhang

E-Mail Website
Guest Editor
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710129, China
Interests: uncertainty quantification
Special Issues, Collections and Topics in MDPI journals
Dr. Guijie Li

E-Mail Website
Guest Editor
School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China
Interests: uncertainty quantification; system reliability design; structural reliability analysis
Special Issues, Collections and Topics in MDPI journals
Dr. Shouyi Sun

E-Mail Website
Guest Editor
Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an 710129, China
Interests: tribology of hard coatings; superlubricity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Stiffened composites have excellent damage tolerance, outstanding structural efficiency, and good design ability, which are widely used to load bearing structures in aerospace. With the improvement of equipment performance, the reliability of stiffened composites is increasingly becoming a topic of concern. Because of the complexity of stiffened composite design and the diversity of composite materials, its failure mechanism is very complex, and its reliability analysis is faced with great challenges. It involves not only macro factors such as layer angle and layer thickness, but also the influence of other micro parameters. such as fiber volume fraction and fiber distribution mode of composite materials. In addition, the dispersion of materials is an important factor restricting the reliability of stiffened composites. Therefore, we need to carry out multiscale failure mechanism research, from microscopic parameters to the macroscopic mechanical properties, and quantify the uncertain factors of design, molding, machining, and assembly for stiffened composites, and then develop multiscale reliability analysis methods to improve the reliability of stiffened composites.

This Special Issue will focus on the failure behaviors and mechanical properties of stiffened composites and the reliability analysis model considering the mesoscopic and macroscopic parameters. New experimental techniques and theoretical studies on these fields are highly welcome in this issue. Submissions of original research articles, review articles, and case studies are all welcome.

Dr. Feng Zhang
Dr. Guijie Li
Dr. Shouyi Sun
Guest Editors

Manuscript Submission Information

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Keywords

  • stiffened composite
  • composite materials
  • multiscale reliability analysis
  • structural reliability
  • fiber volume fraction
  • fiber distribution mode
  • microscopic failure criterion
  • composite interface
  • damage degradation model
  • uncertainty quantization
  • failure mechanism

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Published Papers (5 papers)

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Research

19 pages, 6911 KiB  
Article
Reliability Optimization of the Honeycomb Sandwich Structure Based on A Neural Network Surrogate Model
by Zheng Wei, Chunping Zhou, Feng Zhang and Changcong Zhou
Materials 2023, 16(23), 7465; https://doi.org/10.3390/ma16237465 - 30 Nov 2023
Cited by 2 | Viewed by 1002
Abstract
Composite radomes are usually located in the nose of aircraft and are important structural components that protect radar antenna. The finite element model of a radome structure is developed and analyzed in this article. Single-objective deterministic and reliability optimization models based on the [...] Read more.
Composite radomes are usually located in the nose of aircraft and are important structural components that protect radar antenna. The finite element model of a radome structure is developed and analyzed in this article. Single-objective deterministic and reliability optimization models based on the minimum total mass of the radome structure were established, and the layer thickness of each part of the honeycomb sandwich radome structure was considered a design variable. A multi-objective deterministic and reliability optimization model for a radome structure with a minimum total mass and maximum buckling critical load was established, and a particle swarm optimization algorithm was used to solve the problem. Our optimized results satisfied the constraints and utilization rate of materials, and structural safety was improved. Full article
(This article belongs to the Special Issue Multiscale Reliability Analysis of Stiffened Composites)
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21 pages, 14732 KiB  
Article
A Study on the Performance of Prestressed Concrete Containment with Carbon Fiber-Reinforced Polymer Tendons under Internal Pressure
by Xiaolan Pan, Aonan Tian, Lianpeng Zhang and Zhi Zheng
Materials 2023, 16(21), 6883; https://doi.org/10.3390/ma16216883 - 26 Oct 2023
Cited by 1 | Viewed by 1129
Abstract
As the last barrier to preventing nuclear leakage, it is crucial to enhance the load-bearing capacity and cracking resistance of nuclear containment under internal pressure accidents. Currently, fiber-reinforced polymers are widely used in prestressing concrete structures because of their superior performance, but little [...] Read more.
As the last barrier to preventing nuclear leakage, it is crucial to enhance the load-bearing capacity and cracking resistance of nuclear containment under internal pressure accidents. Currently, fiber-reinforced polymers are widely used in prestressing concrete structures because of their superior performance, but little research has been conducted on fiber-reinforced polymers in the field of nuclear power plants. In this paper, carbon fiber-reinforced polymer (CFRP) is used as a prestressing tendon material instead of traditional steel strands to study the damage mode of the new type of containment under internal pressure and the feasibility of using CFRP as prestressing tendons. In this study, a three-dimensional refinement model is established, employing ABAQUS 2020 software to analyze and quantify the pressure-bearing performance of nuclear containment with CFRP tendons and finally determine the reasonable range of CFRP tendons that can be used as a replacement. The research shows that the containment with CFRP tendons has an obvious strengthening effect in delaying the generation of cracks, restraining the speed of crack development, reducing the plastic damage of the steel liner, and improving the ultimate bearing capacity of the containment. Full article
(This article belongs to the Special Issue Multiscale Reliability Analysis of Stiffened Composites)
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23 pages, 5366 KiB  
Article
Uncertainty Propagation for the Structures with Fuzzy Variables and Uncertain-but-Bounded Variables
by Yanjun Xia, Linfei Ding, Pan Liu and Zhangchun Tang
Materials 2023, 16(9), 3367; https://doi.org/10.3390/ma16093367 - 25 Apr 2023
Cited by 3 | Viewed by 1230
Abstract
Various uncertain factors exist in the practical systems. Random variables, uncertain-but-bounded variables and fuzzy variables are commonly employed to measure these uncertain factors. Random variables are usually employed to define uncertain factors with sufficient samples to accurately estimate probability density functions (PDFs). Uncertain-but-bounded [...] Read more.
Various uncertain factors exist in the practical systems. Random variables, uncertain-but-bounded variables and fuzzy variables are commonly employed to measure these uncertain factors. Random variables are usually employed to define uncertain factors with sufficient samples to accurately estimate probability density functions (PDFs). Uncertain-but-bounded variables are usually employed to define uncertain factors with limited samples that cannot accurately estimate PDFs but can precisely decide variation ranges of uncertain factors. Fuzzy variables can commonly be employed to define uncertain factors with epistemic uncertainty relevant to human knowledge and expert experience. This paper focuses on the practical systems subjected to epistemic uncertainty measured by fuzzy variables and uncertainty with limited samples measured by uncertain-but-bounded variables. The uncertainty propagation of the systems with fuzzy variables described by a membership function and uncertain-but-bounded variables defined by a multi-ellipsoid convex set is investigated. The combination of the membership levels method for fuzzy variables and the non-probabilistic reliability index for uncertain-but-bounded variables is employed to solve the uncertainty propagation. Uncertainty propagation is sued to calculate the membership function of the non-probabilistic reliability index, which is defined by a nested optimization problem at each membership level when all fuzzy variables degenerate into intervals. Finally, three methods are employed to seek the membership function of the non-probabilistic reliability index. Various examples are utilized to demonstrate the applicability of the model and the efficiency of the proposed method. Full article
(This article belongs to the Special Issue Multiscale Reliability Analysis of Stiffened Composites)
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26 pages, 9733 KiB  
Article
Investigation and Calculation Method for the Mechanical Properties of Filament Wound Profiles for Deformed Shield Tunnel Reinforcement
by Lei Zhang and Xian Liu
Materials 2023, 16(4), 1645; https://doi.org/10.3390/ma16041645 - 16 Feb 2023
Cited by 2 | Viewed by 1437
Abstract
A new type of structural material has begun to be used in the reinforcement of deformed shield tunnels, known as filament wound profiles (FWPs). The FWPs are formed by wrapping carbon-fiber-reinforced polymer (CFRP) around steel tubes that are grouted with concrete inside. However, [...] Read more.
A new type of structural material has begun to be used in the reinforcement of deformed shield tunnels, known as filament wound profiles (FWPs). The FWPs are formed by wrapping carbon-fiber-reinforced polymer (CFRP) around steel tubes that are grouted with concrete inside. However, for practical engineering applications, the design of FWPs requires further insight into their mechanical behavior, since there is no standard method for this at present. In this study, compression and bending tests were carried out to investigate the mechanical behavior of FWPs. A reliable numerical model was established based on the test results, and the effects of the design parameters on the mechanical properties of the FWPs were analyzed qualitatively. The key design parameters of bearing capacity and stiffness were determined through numerical experiments. Based on the experimental results, a method for the calculation of bearing capacities and stiffness was proposed. It was verified that the results of the calculation formulae and the experimental results showed good agreement. Moreover, the results of the formulae were relatively conservative, and most of the errors were within 15%. Thus, this calculation method can be used to calculate the load-bearing capacity and stiffness of FWPs in practical projects. Full article
(This article belongs to the Special Issue Multiscale Reliability Analysis of Stiffened Composites)
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22 pages, 11379 KiB  
Article
Experimental Investigation of the Deformed Stagger-Jointed Segmental Tunnel Linings Strengthened by Epoxy-Bonded Filament Wound Profiles
by Lei Zhang and Xian Liu
Materials 2022, 15(19), 6862; https://doi.org/10.3390/ma15196862 - 2 Oct 2022
Cited by 4 | Viewed by 1727
Abstract
A new type of Filament Wound Profiles (FWPs) have been applied to strengthen the deformed stagger-jointed segmental tunnel linings, and a full-scale test was carried out on the ultimate bearing capacity of the linings that are strengthened by the new FWPs. The failure [...] Read more.
A new type of Filament Wound Profiles (FWPs) have been applied to strengthen the deformed stagger-jointed segmental tunnel linings, and a full-scale test was carried out on the ultimate bearing capacity of the linings that are strengthened by the new FWPs. The failure phenomena and the main experimental results were obtained, including the load-displacement curve, strain and bond failure. The internal forces of the FWPs in the strengthened lining were calculated and discussed. The failure chain and weak sections of the strengthened lining were discussed. The overall strengthening benefits were summarized. The results show that: (1) The FWPs were in the state of compression bending or tension bending, and bore part of the axial force and bending moment in the strengthened lining. (2) The initial failure of the strengthened linings was caused by the bond failure between the FWPs and the concrete linings at 0°. (3) The filament wound profiles strengthening method can effectively improve the ultimate bearing capacity and stiffness of the stagger-jointed shield tunnel linings. Full article
(This article belongs to the Special Issue Multiscale Reliability Analysis of Stiffened Composites)
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