scholarly journals Experimental and semianalytical investigation of X850 ± IM190 CFRP bolted joints

2020 ◽  
Vol 29 ◽  
pp. 096369351989500
Author(s):  
Boling He
Keyword(s):  
Bolted Joints ◽  
Design Parameters ◽  
Material System ◽  
Commercial Aircraft ◽  
Reinforced Polymer ◽  
Epoxy Material ◽  
Static Tensile ◽  
Curing Method ◽  
Tensile Experiment ◽  
Bolt Diameter

Considering the fact that the foundation data for a new X850 ± IM190 carbon/epoxy material system adopted in commercial aircraft industry are extremely scarce in the literature, an in-plane, static tensile experiment was carried out to investigate the bearing performance of double-lap, single-bolt joints in X850 ± IM190 carbon fiber-reinforced polymer (CFRP) composites. The effects of ply ratio, 0° layers’ combination percentage, bolt diameter, and curing method were considered. Then, special attention was paid to determine the design parameters of X850 ± IM190 CFRP bolted joints, such as tensile strength of un-notched laminate and stress concentration relief factor. Based on these design parameters, an efficient semianalytical approach was established to obtain the ultimate bearing strength of the joints. The failure prediction exhibited excellent agreement with the experimental data. These results will play an important role in design and strength evaluation of X850 ± IM190 CFRP bolted joints.

scholarly journals CONCEPTUAL DESIGN FOR ASSEMBLY IN AEROSPACE INDUSTRY: SENSITIVITY ANALYSIS OF MATHEMATICAL FRAMEWORK AND DESIGN PARAMETERS

2021 ◽  
Vol 1 ◽  
pp. 731-740
Author(s):  
Giovanni Formentini ◽  
Claudio Favi ◽  
Claude Cuiller ◽  
Pierre-Eric Dereux ◽  
Francois Bouissiere ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Conceptual Design ◽  
Design Parameters ◽  
Design For Assembly ◽  
Mathematical Framework ◽  
Commercial Aircraft ◽  
System Architectures ◽  
Complex Engineering ◽  
Aircraft System ◽  
Definition Of

AbstractOne of the most challenging activity in the engineering design process is the definition of a framework (model and parameters) for the characterization of specific processes such as installation and assembly. Aircraft system architectures are complex structures used to understand relation among elements (modules) inside an aircraft and its evaluation is one of the first activity since the conceptual design. The assessment of aircraft architectures, from the assembly perspective, requires parameter identification as well as the definition of the overall analysis framework (i.e., mathematical models, equations).The paper aims at the analysis of a mathematical framework (structure, equations and parameters) developed to assess the fit for assembly performances of aircraft system architectures by the mean of sensitivity analysis (One-Factor-At-Time method). The sensitivity analysis was performed on a complex engineering framework, i.e. the Conceptual Design for Assembly (CDfA) methodology, which is characterized by level, domains and attributes (parameters). A commercial aircraft cabin system was used as a case study to understand the use of different mathematical operators as well as the way to cluster attributes.

Interfacial stresses in reinforced concrete cantilever members strengthened with fibre-reinforced polymer laminates

2019 ◽  
Vol 23 (2) ◽  
pp. 277-288 ◽  
Author(s):  
Xue-jun He ◽  
Chao-Yang Zhou ◽  
Yi Wang
Keyword(s):  
Reinforced Concrete ◽  
Interfacial Stress ◽  
Design Parameters ◽  
Stress Concentrations ◽  
Concentrated Load ◽  
Interfacial Stresses ◽  
Simply Supported ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Polymer Laminates

Fibre-reinforced polymers have been increasingly used to strengthen reinforced concrete structures. However, premature brittle debonding failures may occur at the ends of externally bonded fibre-reinforced polymer laminates due to interfacial stress concentrations caused by stiffness imbalances. Although many studies exist on fibre-reinforced polymer-strengthened simply supported beams and slabs, the interfacial stress distributions in fibre-reinforced polymer-strengthened cantilever members are very different from those in simply supported members. Based on the assumptions of linear elasticity, deformation compatibility and static equilibrium conditions, the interfacial stresses in fibre-reinforced polymer-strengthened reinforced concrete cantilever members under arbitrary linear distributed loads were analysed. In particular, closed-form solutions were obtained to calculate the interfacial stresses under either a uniformly distributed load or a single concentrated load located at the overhanging end of the cantilever member. Existing test results on cantilever slabs strengthened by carbon fibre–reinforced polymer sheets were used to verify the model. According to the parametric analysis, the maximum interfacial stresses can be reduced by decreasing the fibre-reinforced polymer thickness, increasing the fibre-reinforced polymer bonding length and increasing the adhesive layer thickness, and by using less rigid fibre-reinforced polymer laminates with high tensile strengths. These results are useful for engineers seeking to optimize strengthening design parameters and implement reliable debonding prevention measures.

Prior and post peaks compressive behavior of concrete-filled double-skin tubular columns with BFRP-punched-in outer steel and BFRP-circular inner steel

2020 ◽  
Vol 23 (13) ◽  
pp. 2911-2927
Author(s):  
Yung William Sasy Chan ◽  
Zhi Zhou ◽  
Zhenzhen Wang ◽  
Jinping Ou
Keyword(s):  
Load Capacity ◽  
High Energy ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Peak Performance ◽  
Design Parameters ◽  
Fiber Reinforced ◽  
Tubular Columns ◽  
Reinforced Polymer ◽  
Double Skin

Fiber-reinforced polymer composites have been widely used to design fiber-reinforced polymer–based confined concrete columns with potential benefits. However, it is critical to design a column with sufficient post-peak performance that can prevent its collapse at the rupture of the fiber-reinforced polymer tube. This article presents the experimental results on the prior and post peaks behavior of concrete-filled double-skin tubular columns with basalt fiber-reinforced polymer (BFRP)–punched-in outer steel and BFRP-circular inner steel (BFST-DSTCs). Twenty-two specimens were tested under axial compression to investigate the effects of design parameters on the behavior of the BFST-DSTC. The outcomes reveal that the BFST-DSTC exhibits the best performance in terms of load capacity, confinement ratio, failure and damage mechanisms, and ductility in prior and post peaks. The inner fiber-reinforced polymer jacket delays the buckling of the inner tube. The punched-in patterns of the outer steel improve the confinement effectiveness of the fiber-reinforced polymer jacket. The BFST-DSTC displays a good post-peak performance with high-energy dissipation capacity that prevents the concerned structure from collapse after the fiber-reinforced polymer jacket rupture. Finally, a new confinement model is proposed to predict the ultimate point of the confined concrete.

Design and Fabrication of an Optical-MEMS Sensor

2007 ◽  
Vol 1052 ◽  
Author(s):  
Vaibhav Mathur ◽  
Jin Li ◽  
William D. Goodhue
Keyword(s):  
Single Mode ◽  
External Source ◽  
Design Parameters ◽  
Material System ◽  
Test Results ◽  
Coupling Loss ◽  
Optical Mems ◽  
Mems Sensor ◽  
Fundamental Frequencies ◽  
Vibration Sensing

AbstractA novel optical-MEMS sensor based on the AlGaAs material system is designed and fabricated. The device consists of micro-beam waveguides butt-coupled with their ends separated by approximately 2 to 4 µm. The device works on the principle that when acoustically driven by an external source, the waveguides misalign, leading to coupling loss. The device design parameters were determined using FEM (Finite Element Method) modeling. The dielectric waveguide beams were designed for single mode propagation at 785 nm and longer wavelengths. A combination of dry and wet etching process followed by precision laser cutting was used to fabricate the suspended beams. Beams ranging from 100 µm to 400 µm with fundamental frequencies of 50 KHz to 200 KHz were successfully fabricated. Initial uncut waveguide test results will be discussed along with the plan for characterizing the devices using an acoustically coupled piezoelectric driver. These devices may be utilized for vibration sensing, or optical intensity modulation.

scholarly journals Effects of moisture absorption on damage progression and strength of unidirectional and cross-ply fiberglass–epoxy composites

2018 ◽  
Vol 3 (1) ◽  
pp. 427-438
Author(s):  
Jake D. Nunemaker ◽  
Michael M. Voth ◽  
David A. Miller ◽  
Daniel D. Samborsky ◽  
Paul Murdy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Fiber Reinforced Polymer ◽  
Material System ◽  
Marine Environments ◽  
Reinforced Polymer ◽  
Damage Progression ◽  
Fiber Reinforced Polymer Composites ◽  
Superior Mechanical Properties ◽  
Marine Hydrokinetic

Abstract. Fiber-reinforced-polymer composites (FRPs) possess superior mechanical properties and formability, making them a desirable material for construction of large optimized mechanical structures, such as aircraft, wind turbines, and marine hydrokinetic (MHK) devices. However, exposure to harsh marine environments can result in moisture absorption into the microstructure of the FRPs comprising these structures and often degrading mechanical properties. Specifically, laminate static and fatigue strengths are often significantly reduced, which must be considered in design of FRP structures in marine environments. A study of fiberglass epoxy unidirectional and cross-ply laminates was conducted to investigate hygrothermal effects on the mechanical behavior of a common material system used in wind applications. Several laminates were aged in 50 ∘C distilled water until maximum saturation was reached. Unconditioned control and the saturated samples were tested in quasi-static tension with the accompaniment of acoustic emission (AE) monitoring. Cross-ply laminates experienced a 54 % reduction in strength due to moisture absorption, while unidirectional laminate strengths were reduced by 40 %. Stress–strain curves and AE activity of the samples were analyzed to identify changes in damage progression due to aging.

Influence of Material System, Lay-Up and Thickness on the Energy Absorption Capability of Composite Laminates

2006 ◽  
Author(s):  
Stefano Mian ◽  
Marino Quaresimin ◽  
Stefano Magistrali
Keyword(s):  
Energy Absorption ◽  
Composite Laminates ◽  
Energy Levels ◽  
Low Velocity Impact ◽  
Design Parameters ◽  
Material System ◽  
Low Velocity ◽  
Glass Carbon ◽  
Laminate Thickness ◽  
Key Parameter

The paper presents the results of an experimental campaign devoted to investigate energy absorption during impact and its dependence on some relevant design parameters, such as material system, laminate thickness and laminate lay-up. Three different material systems were investigated, carbon/epoxy, kevlar/epoxy and glass/epoxy, and four stacking sequences [0]8, [0/45]2s, [0]12 and [0/45]3s. A total of 11 different configurations were considered, including a hybrid glass-carbon-kevlar/epoxy laminate. Low velocity impact tests were carried out on flat samples at several energy levels from barely visible damage up to penetration, according to ASTM 5628 standard. The penetration energy is pointed out as a key-parameter in determining the absorption capability of a laminate.

scholarly journals Assessment of CNT-doping and hot-wet storage aging effects on Mode I, II and I/II interlaminar fracture toughness of a UD Graphite/Epoxy material system

2020 ◽  
Vol 224 ◽  
pp. 106761 ◽  
Author(s):  
Theofanis S. Plagianakos ◽  
Kirsa Muñoz ◽  
Gerard Guillamet ◽  
Vasileios Prentzias ◽  
Adrià Quintanas-Corominas ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Mode I ◽  
Material System ◽  
Interlaminar Fracture Toughness ◽  
Aging Effects ◽  
Interlaminar Fracture ◽  
Wet Storage ◽  
Epoxy Material
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