Poisson contraction in aligned fibre composites showing pull-out

1976 ◽  
Vol 11 (3) ◽  
pp. 582-586 ◽  
Author(s):  
A. Kelly ◽  
C. Zweben
Keyword(s):  
Pull Out ◽  
Fibre Composites ◽  
Poisson Contraction

Poisson contraction effects in aligned fibre composites

1976 ◽  
Vol 11 (8) ◽  
pp. 1578-1581 ◽  
Author(s):  
D. J. Pinchin
Keyword(s):  
Fibre Composites ◽  
Poisson Contraction

Potential of Sisal Reinforced Biodegradable Polylactic Acid and Polyvinyl Alcohol Composites

2010 ◽  
Vol 425 ◽  
pp. 167-178 ◽  
Author(s):  
Iman M. Taha ◽  
Gerhard Ziegmann
Keyword(s):  
Polyvinyl Alcohol ◽  
Polylactic Acid ◽  
Failure Modes ◽  
Single Fibre ◽  
Natural Fibre ◽  
Natural Fibres ◽  
Green Composite ◽  
Surrounding Matrix ◽  
Pull Out ◽  
Fibre Composites

The application of natural fibres as polymer reinforcement is of extreme interest, especially in combination with biodegradable polymers. Such “green” composite represent a step forward to eco-design and environmentally friendly applications. The use of biodegradable polylactic acid (PLA) on the basis of renewable resources in addition to the biodegradable polyvinyl alcohol (PVA) on petrochemical basis is compared in this study with the application of polypropylene (PP) as a surrounding matrix for sisal fibres. According to the law of similarities, the chemically similar structure of natural fibres and PVA and PLA provides stronger fibre-matrix bonding characteristics compared to PP. This was experimentally validated applying single-fibre pull-out tests, where the effect of improved bonding is further investigated in terms of tensile and impact composite behaviour. SEM investigation was further applied to describe failure modes of natural fibre composites.

Pull-out and fragmentation in model fibre composites

Composites ◽  
1991 ◽  
Vol 22 (6) ◽  
pp. 474
Keyword(s):  
Pull Out ◽  
Fibre Composites

Pull-out and fragmentation in model fibre composites

1991 ◽  
Vol 26 (9) ◽  
pp. 2467-2476 ◽  
Author(s):  
A. N. Gent ◽  
G. L. Liu
Keyword(s):  
Pull Out ◽  
Fibre Composites

The influence of heat treatment on the fiber/matrix interface in a SiC-reinforced glassceramic

1988 ◽  
Vol 46 ◽  
pp. 742-743
Author(s):  
E. Bischoff ◽  
O. Sbaizero
Keyword(s):  
Heat Treatment ◽  
Aluminum Silicate ◽  
Lithium Aluminum ◽  
Interfacial Region ◽  
Specimen Preparation ◽  
Crack Wake ◽  
Pull Out ◽  
Annealed Material ◽  
Ultrasonic Drilling ◽  
Fiber Matrix Interface

Fiber or whisker reinforced ceramics show improved toughness and strength. Bridging by intact fibers in the crack wake and fiber pull-out after failure contribute to the additional toughness. These processes are strongly influenced by the sliding and debonding resistance of the interfacial region. The present study examines the interface in a laminated 0/90 composite consisting of SiC (Nicalon) fibers in a lithium-aluminum-silicate (LAS) glass-ceramic matrix. The material shows systematic changes in sliding resistance upon heat treatment.As-processed samples were annealed in air at 800 °C for 2, 4, 8, 16 and 100 h, and for comparison, in helium at 800 °C for 4 h. TEM specimen preparation of as processed and annealed material was performed with special care by cutting along directions having the fibers normal and parallel to the section plane, ultrasonic drilling, dimpling to 100 pm and final ionthinning. The specimen were lightly coated with Carbon and examined in an analytical TEM operated at 200 kV.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

Advances in ultramicrotomy for physical sciences applications

1993 ◽  
Vol 51 ◽  
pp. 710-711
Author(s):  
G. McMahon ◽  
T. Malis
Keyword(s):  
Particle Surface ◽  
Zeolite Catalysts ◽  
Physical Sciences ◽  
Pull Out ◽  
Large Particles ◽  
Novel Applications ◽  
Metal Wires ◽  
Frequent Problem ◽  
Specific Orientation ◽  
Diamond Knife

As with all techniques which are relatively new and therefore underutilized, diamond knife sectioning in the physical sciences continues to see both developments of the technique and novel applications.Technique Developments Development of specific orientation/embedding procedures for small pieces of awkward shape is exemplified by the work of Bradley et al on large, rather fragile particles of nuclear waste glass. At the same time, the frequent problem of pullout with large particles can be reduced by roughening of the particle surface, and a proven methodology using a commercial coupling agent developed for glasses has been utilized with good results on large zeolite catalysts. The same principle (using acid etches) should work for ceramic fibres or metal wires which may only partially pull out but result in unacceptably thick sections. Researchers from the life sciences continue to develop aspects of embedding media which may be applicable to certain cases in the physical sciences.

Pull-out behaviour of hooked steel fibres

10.1617/13472 ◽  
2005 ◽  
Vol 35 (251) ◽  
Author(s):  
P. Robins
Keyword(s):  
Steel Fibres ◽  
Pull Out

Code performance assessment: application to the pull-out strength of concrete

10.1617/14219 ◽  
2005 ◽  
Vol 38 (281) ◽  
pp. 691-699
Author(s):  
J. Al-Hajjar
Keyword(s):  
Performance Assessment ◽  
Pull Out ◽  
Code Performance ◽  
Pull Out Strength
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