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adhesive fracture
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Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003324
EISBN: 978-1-62708-176-4
... in the measurement of adhesive joint strength. These include qualitative tests, peel tests, lap shear tests, tensile tests, and adhesive fracture mechanics tests. adhesive fracture adhesive joints lap shear test mechanical strength peel test qualitative test tensile test MOST ENGINEERING DESIGNS...
Abstract
Adhesive joints involve joining parts by bonding component parts together with an adhesive. This article provides a discussion on the purpose of testing adhesive joints and on the factors influencing mechanical strength of these joints. It describes the various tests used in the measurement of adhesive joint strength. These include qualitative tests, peel tests, lap shear tests, tensile tests, and adhesive fracture mechanics tests.
Image
Published: 01 January 2001
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003467
EISBN: 978-1-62708-195-5
... was lost and not available for evaluation. The adhesive, still attached to the aluminum core, did not exhibit any visible fracture features, although porosity is evident throughout. The adhesive itself is a consistent shade of light gold over most of the fracture surface, except under the remaining section...
Abstract
This article describes the results of several case history studies of the failure of polymer-matrix composite components to provide not only some representative types of failures that can encounter, but also to provide some insight into the investigative process. These case histories deal mainly with structures that exhibit an initial material and/or manufacturing defect or failures that are most prevalent and most easily solved. The components include helicopter rotor blade, composite wing spar, and aircraft rudder.
Book Chapter
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003280
EISBN: 978-1-62708-176-4
... that the work of adhesion can be done by applying a large force over a small distance (uniform tension) or a small force over a large distance (as in peeling or sliding). In a similar way, the fracture threshold also depends on the mode of separation, such as tension versus shear. Therefore, an adhesion test...
Abstract
This article describes measurement techniques for the three basic types of adhesion: fundamental adhesion, thermodynamic adhesion, and practical adhesion. It discusses common measurement methods for each type of adhesion with the main focus on practical adhesion testing of coatings and thin films. The article provides an insight into the mechanisms of environmentally induced interfacial degradation by discussing the fundamental aspects of adhesion between two dissimilar materials. It examines the use of adhesion tests in the evaluation of stress-corrosion cracking within bimaterial interfaces. Testing techniques for <i>in situ</i> environmental testing of thin-film adhesion are also reviewed.
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003374
EISBN: 978-1-62708-195-5
..., and composite laminate tests. The effects of interphase and fiber-matrix adhesion on composite mechanical properties, such as composite on-axis properties, composite off-axis properties, and composite fracture properties, are also discussed. fiber-matrix adhesion composite material fiber matrix...
Abstract
Fiber-matrix adhesion is a variable to be optimized in order to get the best properties and performance in composite materials. This article schematically illustrates fiber matrix interphase for composite materials. It discusses thermodynamics of interphase in terms of surface energy, contact angle, work of adhesion, solid surface energy, and wetting and wicking. The article describes the change in interphase depending on the reinforcing fiber such as glass fiber, polymeric fiber, and carbon fiber. It emphasizes fiber-matrix adhesion measurements by direct methods, indirect methods, and composite laminate tests. The effects of interphase and fiber-matrix adhesion on composite mechanical properties, such as composite on-axis properties, composite off-axis properties, and composite fracture properties, are also discussed.
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009081
EISBN: 978-1-62708-177-1
... that there is extensive interlayer delamination between almost every layer. ( Figure 3b to e ) is a series of micrographs taken with higher magnification from areas in Fig. 3(a) . It can be seen that there is extensive fiber fracture ( Fig. 3b ) and mostly adhesive failure at the fiber-matrix interface, as shown...
Abstract
This article describes methods for analyzing impact-damaged composites in the aircraft industry. These include C-scan and x-radiography methods and optical microscopy. The article reviews brittle-matrix composite and tough-matrix composite failures. It explains the different types of composite failure mechanisms such as thermoplastic-matrix composite failure mechanisms, untoughened thermoset-matrix composite failure mechanisms, toughened thermoset-matrix composite failure mechanisms, dispersed-phase and rubber-toughened thermoset-matrix composite failure mechanisms, and particle interlayer-toughened composite failure mechanisms.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001348
EISBN: 978-1-62708-173-3
... of effects have been attempted for impurity-controlled fracture properties in iron, which has been studied extensively by Hondros and Seah ( Ref 30 ). A simple linear formula linking cohesion and level of impurities has been extracted from many experiments ( Ref 30 ). Adhesion Measurement Sikorski...
Abstract
This article reviews quantifying adhesion, bonding, and interfacial characterization and strength in a solid-state welding process. It discusses metal-metal configurations and provides information on experimental work carried out in measuring the mechanical properties of interfaces based on theoretical analysis. A discussion on the properties affecting adhesion is also provided.
Image
Published: 01 January 2001
Fig. 10 Comparison of fracture toughness to lap shear strength for various bond types/methods. PEEK, polyetheretherketone; PEI, polyetherimide. Adhesive 1, Ciba Geigy AV138M, 100 °C (210 °F) cure; adhesive 2, Ciba Geigy AY103, 100 °C (210 °F) cure; adhesive 3, Ciba Geigy AV118, 180 °C (355 °F
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Published: 01 January 1993
Fig. 3 Cohesive fracture surface in a properly processed composite-to-composite adhesive bond. Visible fibers are the random mat carrier in the adhesive film. 68×
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Published: 01 November 1995
Fig. 3 Cohesive fracture surface in a properly processed composite-to-composite adhesive bond. Visible fibers are the random mat carrier in the adhesive film. 68×
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Published: 15 January 2021
Fig. 5 Adhesive wear mechanisms. (a) Adhesive bonding. (b) Plastic shearing. (c) Fracture-induced formation of third-body particles. Adapted from Ref 25
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Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003463
EISBN: 978-1-62708-195-5
... Examination of separated plies in a graphite-epoxy laminate to determine sequence of fracture. ∼0.8× Figure 8 also depicts how fracture sequence information can be gleaned from visual examination of the fracture surfaces. In this figure, numerous transverse cracks are evident in the thick adhesive...
Abstract
Mechanical and environmental loadings cause a variety of failure modes in composites, including matrix cracking, fiber-matrix debonding, delamination between plies, and fiber breakage. This article summarizes visual analysis and nondestructive testing methods for the failure analysis of composites. These methods include radiography, ultrasonic techniques, acoustic emission, and thermograph. The article also provides information on destructive test techniques.
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... and some erosion processes can involve dissolution. Adhesive wear is fracture produced by solid-state bonding of one material to another. If motion persists after bonding, fracture must take place. Material “A” may fracture, with some of it bonding to contacting material “B,” or the fractured material...
Abstract
This article considers the main characteristics of wear mechanisms and how they can be identified. Some identification examples are reported, with the warning that this task can be difficult because of the presence of disturbing factors such as contaminants or possible additional damage of the worn products after the tribological process. Then, the article describes some examples of wear processes, considering possible transitions and/or interactions of the mechanism of fretting wear, rolling-sliding wear, abrasive wear, and solid-particle erosion wear. The role of tribological parameters on the material response is presented using the wear map concept, which is very useful and informative in several respects. The article concludes with guidelines for the selection of suitable surface treatments to avoid wear failures.
Image
Published: 01 January 2001
Fig. 8 Comparison between the mode I and mode II fracture toughness of the three composite materials. The mode II fracture toughness is about three times higher than the mode I fracture toughness. The fiber-matrix adhesion decreases in the order AS-4C > AS-4 > AU-4. AU-4 and AS-4 exhibit
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Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001286
EISBN: 978-1-62708-170-2
... be important to the performance of the surface. For example, a wear coating on a soft substrate will not function well if, under load, it is fractured by the deformation of the underlying substrate. Also, good film adhesion cannot be obtained when the substrate surface is mechanically weak, because failure can...