SEM fractography and failure analysis of nonmetallic materials

McCoy, R. A.

doi:10.1361/15477020421773

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…These images were captured when meso-fibrils were exposed after breaking a single fiber with 0.25 mm/min displacement rate. The radial steps or chevron (arrow) indicates the presence of rotational failure (Figure 7a) [36,37]. When a glass fiber is subjected to torsion, a helical crack is created and propagates along the surface.…”

Section: Fractographic Analysis Of Single Fibersmentioning

confidence: 99%

“…The crack initiates at some defects or voids furthest from the center of the fiber as stress is maximum at that point. This crack propagation usually occurs at 45 • angle with respect to the fiber longitudinal axis [36,37]. In other words, due to the applied shear stress, two principal stresses are created in a small element of the fiber: one is compressive and another is tensile.…”

Section: Fractographic Analysis Of Single Fibersmentioning

confidence: 99%

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Dynamic In-Situ Observation on the Failure Mechanism of Flax Fiber through Scanning Electron Microscopy

Ahmed

Ulven

2018

Fibers

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In order to develop and improve bio-inspired fibers, it is necessary to have a proper understanding of the fracture behavior of bio-fibers such as flax fibers from an individual fiber down to the constituent micro-fibrils and nano-fibrils. For investigating the failure mechanism of individual and technical flax fibers, a tensile test bench was placed within a scanning electron microscope, and the entire process of fiber failure was investigated through the capture of an SEM movie. Next, fractographic analysis was performed on the failure surface of single fibers as well as meso-fibrils that failed at a displacement rate of 0.25 mm/min, 0.75 mm/min, and 1.6 mm/min. The analysis also enabled visualization of a few internal details of flax fiber such as the arrangement of meso-fibrils and micro-fibrils (nano-fibrils). It was shown that the crack bridging mechanism and successive fiber pull-out contributed to the high work of fracture of flax fiber and the value may reach as high as 10 6 J/m 2 .

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Section: Fractographic Analysis Of Single Fibersmentioning

confidence: 99%

Section: Fractographic Analysis Of Single Fibersmentioning

confidence: 99%

Dynamic In-Situ Observation on the Failure Mechanism of Flax Fiber through Scanning Electron Microscopy

Ahmed

Ulven

2018

Fibers

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“…These features are called Wallner's lines. 11 When the critical flaw size is reached, the fractured surface morphology drastically changes to become rougher, with radial striations, which are associated with a brittle, very fast propagating fracture behavior.…”

Section: Non-aged Materialsmentioning

confidence: 99%

The effect of irradiation, annealing temperature, and artificial aging on the oxidation, mechanical properties, and fracture mechanisms of UHMWPE

Luisetto

Wesslén

Maurer

et al. 2003

J Biomedical Materials Res

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UHMWPE crosslinked using Gamma radiation is believed to have improved wear properties, and this has been extensively studied during the past 10 years. Mechanical properties, oxidation, and wear properties of UHMWPE materials subjected to various thermal treatments have been investigated immediately after irradiation as well as after several years of aging. Nevertheless, the relationship between all these parameters is not yet fully understood. The aim of this study was to investigate the relationship between the thermal treatments that could be applied to irradiated UHMWPE [lower (gamma 60) or higher (gamma 150) than 140 degrees C, the melting temperature of the polymer] and the mechanical properties, the oxidation and the fracture behavior of the material. The effect of artificial aging on these properties was also investigated. This study concludes that immediately after the annealing, the mechanical properties (UTS and epsilon) of the irradiated and annealed material are improved compared with those of nonirradiated material. Although nonirradiated material has higher fracture toughness than irradiated and annealed materials, the materials break according to the same mechanism of fracture. After aging, no changes could be observed in any of the measured properties for nonirradiated material. On the other hand, important changes could be seen in both irradiated and annealed material after aging. Both UTS and epsilon decreased, much more so in the case of gamma 60. Furthermore, the aging induced a subsurface peak of oxidation in both irradiated and annealed materials, twice as intense for gamma 60 than for gamma 150. The mechanism of fracture of these materials changed drastically after aging, probably due to the presence of the oxidation peak, which seems to occur at a location where cracks initiate easily compared with the nonoxidized bulk of the material. In the case of gamma 60, it seems clear that a correlation between mechanical property, oxidation, and fracture mechanism exists. Such a relationship could not be found for gamma 150.

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“…This can be due to rapid crack propagation that occurs at high strain rate loading. 33 Generally, the shear strength is higher at high strain rate compared with that at quasi-static strain rate. This can be attributed to the fact that at lower strain rates the damage propagates slowly utilizing most of the applied energy.…”

mentioning

confidence: 98%

“…Similar observation were made by Fleck et al 19 and McCoy. 33 Scanning electron microscope (SEM) images of the failed surfaces were studied. Figure 14(a) shows SEM image of acrylic failed at quasi static loading, and Figure 14(b) shows SEM image of acrylic tested at high strain rate loading.…”

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confidence: 99%

Shear properties of acrylic under high strain rate loading

Gelu

Joshi

Naik

2011

J of Applied Polymer Sci

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Acrylic is being used in structural applications because of its higher resistance to projectile impacts. High strain rate shear loading is one of the critical conditions. In the present study, properties of typical acrylic under high strain rate shear loading are presented. Torsional Split Hopkinson Bar apparatus was used for the studies in the shear strain rate range of 290 per sec to 791 per sec. Thin-walled tubular specimens with hexagonal flanges were used for the experimental studies. Details of specimen configuration, data acquisition, and processing are presented. Shear strength is presented as a function of shear strain rate. It is observed that the shear strength at high strain rate is enhanced up to 25% compared with that at quasi-static loading in the range of parameters considered. Comparison of torque versus time behavior derived from signals obtained from strain gauges mounted on incident bar and transmitter bar is also presented.

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SEM fractography and failure analysis of nonmetallic materials

Cited by 14 publications

References 2 publications

Dynamic In-Situ Observation on the Failure Mechanism of Flax Fiber through Scanning Electron Microscopy

Dynamic In-Situ Observation on the Failure Mechanism of Flax Fiber through Scanning Electron Microscopy

The effect of irradiation, annealing temperature, and artificial aging on the oxidation, mechanical properties, and fracture mechanisms of UHMWPE

Shear properties of acrylic under high strain rate loading

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