Failure Analysis of an Adhesively Bonded Graphite Composite/Steel Scarf Joint

1978 ◽  
Vol 100 (1) ◽  
pp. 64-69 ◽  
Author(s):  
A. B. Macander ◽  
D. R. Mulville
Keyword(s):  
High Performance ◽  
Structural Integrity ◽  
Strain Energy Release ◽  
Organic Matrix ◽  
Structural Elements ◽  
Adhesively Bonded ◽  
Graphite Composite ◽  
Scarf Joint ◽  
Bonded Composite ◽  
Composite Steel

Recent studies on the use of graphite fiber-organic matrix composites in Naval and commercial high performance ships have demonstrated the potential for significant weight savings and corresponding improvements in ship performance. Unlike conventional materials, structural elements fabricated with advanced composite materials require specialized attention. One area that is critical to the successful development of reliable composite structural elements is joining. This paper describes a method for determining the structural integrity of an adhesively bonded composite/steel scarf joint. An experimentally established failure criterion is presented based on a strain energy release rate formulation, which may be used to predict performance of the scarf joint under tensile loading.

Qualifications of Adhesives for Marine Composite-to-Steel Bonded Applications

2009 ◽  
Vol 25 (04) ◽  
pp. 198-205
Author(s):  
George W. Ritter ◽  
David R. Speth ◽  
Yu Ping Yang
Keyword(s):  
Mechanical Property ◽  
Structural Integrity ◽  
Adhesively Bonded ◽  
Load Bearing Capacity ◽  
Property Evaluation ◽  
Marine Industry ◽  
Straightforward Method ◽  
Bonded Composite ◽  
Steel Joints ◽  
Marine Composite

This paper describes a straightforward method for the design and certification of adhesively bonded composite to steel joints for the marine industry. Normally, certification is based on documented service at sea. Since these joints have not been previously deployed at sea, no data on their performance exist. Using an integrated combination of mechanical property evaluation and finite element modeling, the load- bearing capacity of a joint can be compared with the anticipated seaway loads. Calculated factors of safety for the sandwich design used here show that the joint has adequate strength to maintain structural integrity even after severe environmental exposure.

CRUSH CHARACTERISTICS OF ADHESIVELY BONDED COMPOSITE-ALUMINUM TUBES

2021 ◽  
Author(s):  
MONISH URAPAKAM RAMAKRISHNAN ◽  
PANKAJ K. MALLICK
Keyword(s):  
Automotive Industry ◽  
High Performance ◽  
Adhesive Bonding ◽  
Heavy Vehicle ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Space Frames ◽  
Bonded Composite ◽  
Light Weighting ◽  
Different Characteristics

Tubular members are used in the automotive industry for body, chassis, and powertrain components such as front rails, underbody frames or sub frames, driveshaft structures and space frames. They are also extensively used in buses and other heavy vehicle structures. With focus on light-weighting, there is increasing use of multimaterial structures with aluminum and high-performance composites. Joining a variety of materials with different characteristics and compositions is a major challenge for the design of such structures. Hence, adhesive bonding is emerging as one of the key joining technique for multi-material structures due to their compatibility with commonly used lightweight materials. Since tubular joints in automotive structures may experience crush type load, this study considers the crush characteristics of composite-aluminum tubular adhesive joints using finite element analysis.

scholarly journals Interaction of Mixed Mode Loading on Cyclic Debonding in Adhesively Bonded Composite Joints

1987 ◽  
Vol 109 (1) ◽  
pp. 17-21 ◽  
Author(s):  
S. Mall ◽  
M. A. Rezaizadeh ◽  
R. Gurumurthy
Keyword(s):  
Mixed Mode ◽  
Strain Energy ◽  
Strain Energy Release ◽  
Analytical Investigation ◽  
Mode I ◽  
Adhesively Bonded ◽  
Total Strain Energy ◽  
Composite Joint ◽  
Governing Factor ◽  
Bonded Composite

A combined experimental and analytical investigation of an adhesively bonded composite joint was conducted to characterize the fracture mode dependence of cyclic debonding. The system studied consisted of graphite/epoxy adherends bonded with EC 3445 adhesive. Several types of specimens were tested which provided the cyclic debond growth rate measurements under various load conditions: mode I, mixed mode I and II, and almost mode II. This study showed that the total strain-energy-release rate was the governing factor for cyclic debonding.

scholarly journals Defects and uncertainties of adhesively bonded composite joints

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Sadik Omairey ◽  
Nithin Jayasree ◽  
Mihalis Kazilas
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Production Efficiency ◽  
Adhesive Bonding ◽  
Detection Methods ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Wide Range ◽  
Bonded Composite

AbstractThe increasing use of fibre reinforced polymer composite materials in a wide range of applications increases the use of similar and dissimilar joints. Traditional joining methods such as welding, mechanical fastening and riveting are challenging in composites due to their material properties, heterogeneous nature, and layup configuration. Adhesive bonding allows flexibility in materials selection and offers improved production efficiency from product design and manufacture to final assembly, enabling cost reduction. However, the performance of adhesively bonded composite structures cannot be fully verified by inspection and testing due to the unforeseen nature of defects and manufacturing uncertainties presented in this joining method. These uncertainties can manifest as kissing bonds, porosity and voids in the adhesive. As a result, the use of adhesively bonded joints is often constrained by conservative certification requirements, limiting the potential of composite materials in weight reduction, cost-saving, and performance. There is a need to identify these uncertainties and understand their effect when designing these adhesively bonded joints. This article aims to report and categorise these uncertainties, offering the reader a reliable and inclusive source to conduct further research, such as the development of probabilistic reliability-based design optimisation, sensitivity analysis, defect detection methods and process development.

scholarly journals Structural integrity of adhesively bonded 3D-printed joints

2021 ◽  
pp. 107262
Author(s):  
Mohammad Reza Khosravani ◽  
Payam Soltani ◽  
Kerstin Weinberg ◽  
Tamara Reinicke
Keyword(s):  
Structural Integrity ◽  
Adhesively Bonded ◽  
3D Printed

An experimental–numerical investigation of hydrothermal response in adhesively bonded composite structures

2015 ◽  
Vol 73 ◽  
pp. 176-185 ◽  
Author(s):  
Roohollah Sarfaraz ◽  
Luis P. Canal ◽  
Georgios Violakis ◽  
John Botsis ◽  
Véronique Michaud ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Composite Structures ◽  
Adhesively Bonded ◽  
Bonded Composite

Functional Coatings for Damage Detection in Aerospace Structures

2021 ◽  
Vol 22 (1) ◽  
pp. 95-103
Author(s):  
Agathe Demay ◽  
Johnathan Hernandez ◽  
Perla Latorre ◽  
Remelisa Esteves ◽  
Seetha Raghavan
Keyword(s):  
Damage Detection ◽  
High Performance ◽  
Structural Integrity ◽  
Alumina Nanoparticles ◽  
Functional Coatings ◽  
Aerospace Structures ◽  
Non Invasive ◽  
Damage Sensing ◽  
Composite Substrate ◽  
Open Hole

The future of aerospace structures is highly dependent on the advancement of reliable and high-performance materials, such as composite materials and metals. Innovation in high resolution non-invasive evaluation of these materials is needed for their qualification and monitoring for structural integrity. Aluminum oxide (or α-alumina) nanoparticles present photoluminescent properties that allow stress and damage sensing via photoluminescence piezospectroscopy. This work describes how these nanoparticles are added into a polymer matrix to create functional coatings that monitor the damage of the underlying composite or metallic substrates. Different volume fractions of α-alumina nanoparticles in the piezospectroscopic coatings were studied for determining the sensitivity of the coatings and successful damage detection was demonstrated for an open-hole tension composite substrate as well as 2024 aluminum tensile substrates with a subsurface notch.

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