Indentation Fractography: A Measure of Brittleness

Lawn, Brian R.; Marshall, David B.

doi:10.6028/jres.089.024

Cited by 19 publications

(9 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The force required to remove an atom from the top (111) plane is, therefore, higher. However, a sphere-on-plane contact will generate ring-and/or cone-cracking on Si(111) as well as Si(100) and poly-Si under sufficiently high loads, regardless of the crystal structure [28]. Highfriction tangential sliding under load generates higher tensile stresses in the wake of the tribocontact than those stresses which form the ring and cone cracks under static condition.…”

Section: Predicted Vs Measured Wearmentioning

confidence: 99%

Tribological behavior of polycrystalline and single-crystal silicon

Gardos¹

1996

Tribol Lett

View full text Add to dashboard Cite

SEM tribometric experiments were performed with polycrystalline silicon (poly-Si) vs. poly-Si and Si(111) vs. Si(111) interfaces in moderate vacuum to 850~ complementing similar recent experiments on Si(100) vs. Si(100). All friction data agree with a hypothesis associating the wear-and thermal desorption-induced generation and cooling-induced adsorptive passivation of dangling bonds on the sliding surfaces with high and low adhesion and friction, respectively. Strong additional evidence is given for a surface re-and deconstruction-induced, temporary reduction in high temperature friction. The wear rate of the various Si vs. Si specimens (on the order of 10 -12 m 3/(N m)) specific to the wide temperature range vacuum test regimen is about 104 times higher than that of unpolished PCD films sliding against themselves under multi-GPa unit loads and similar environmental conditions. In contrast, the characteristic load-carrying capacity of the high-wearing Si, regardless of its crystal structure, was found to be only ,,~ 1 MPa. The wear mechanism of the various Si crystallinities was heavily influenced by the agglomeration and plowing of the wear debris particles trapped in the contact zone.

show abstract

Section: Predicted Vs Measured Wearmentioning

confidence: 99%

Tribological behavior of polycrystalline and single-crystal silicon

Gardos¹

1996

Tribol Lett

View full text Add to dashboard Cite

show abstract

“…Two types of cracks (e.g., cone, median) of penny shape were observed in indentation of brittle solids during loading, followed by crack closure during unloading. Further, it was found that residual stresses present in the deformed material cause formation of lateral cracks that lead to eventual failure (Lawn, 1993(Lawn, , 1983Lawn and Marshal, 1984).…”

Section: Introductionmentioning

confidence: 98%

Deformation field evolution in indentation of a porous brittle solid

Yadav

Saldaña

Murthy

2015

International Journal of Solids and Structures

View full text Add to dashboard Cite

a b s t r a c tAn experimental study of plane strain wedge indentation of a model porous brittle solid has been made to understand the effect of indentation parameters on the evolution of the deformation field and the accompanying volume change. A series of high-speed, high-resolution images of the indentation region and simultaneous measurements of load response were captured through the progression of the indentation process. Particle image velocimetry analysis of the images facilitated in situ measurement of the evolution of the resulting plastic zone in terms of incremental material displacement (velocity), strain rate, strain and volume change (e.g., local pore collapse). These measurements revealed initiation and propagation of flow localizations and fractures, as well as enabled estimate of volume changes occurring in the deformation zone. The results were directly compared with theoretical estimates of indentation pressure and deformation zone geometry and were used to validate a modified cavity expansion solution that incorporates effects of volume changes in the plastic zone.

show abstract

“…The brittle-plastic transition defines which failure mechanism is preferred when an initially elastic loading results in failure. Lawn and Marshall (1979) showed that during an indentation test, which is analogous to an asperity collision, the scale of the minimum length crack that experiences brittle rather than plastic failure is c m and it depends on material properties according to…”

Section: Interpretation Of the Minimum Scale Of Grooving As A Sign Ofmentioning

confidence: 99%

The Minimum Scale of Grooving on a Recently Ruptured Limestone Fault

Okamoto

Brodsky

Thom

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

Faults have grooves that are formed by abrasion and wear during slip. Recent observations indicate that this grooving is only a large‐scale feature, indicating brittle behavior has a length scale limit. The connection between this scale and earthquake behavior remains limited because no examples exist from a proven seismogenic fault. Here, we address this problem and analyze differences in this scale between lithologies to further our understanding of the underlying mechanics. This study uses samples from the Mt. Vettoretto fault collected after the Norcia earthquake of 2016. We imaged fault topography with a white light interferometer and 10 μm resolution structure from motion and then calculated a Monte Carlo version of root mean square roughness. We found a minimum scale of grooving of ~100 μm. In comparing this fault to the Corona Heights fault, we find that this minimum grooving scale is consistent with predictions based on material properties.

show abstract

Indentation Fractography: A Measure of Brittleness

Cited by 19 publications

References 55 publications

Tribological behavior of polycrystalline and single-crystal silicon

Tribological behavior of polycrystalline and single-crystal silicon

Deformation field evolution in indentation of a porous brittle solid

The Minimum Scale of Grooving on a Recently Ruptured Limestone Fault

Contact Info

Product

Resources

About