In-situ observation of damage evolution in polycarbonate subjected to hypervelocity impact

AbstractThe deformation and damage evolution behavior of a Ni-based bulk metallic glass composite reinforced with elongated brass phase is studied under cylindrical indentation. The estimated fracture toughness values based on the energy dissipation and the in-situ observation during the loading reveal the details of the damage evolution and toughening mechanisms in this composite system. The results indicate that the enhanced toughness of the BMG composite is plausibly an outcome of crack bridging mechanisms by the ductile brass phase, rather than a diffused array of nucleated shear bands in the hard BMG and arrest by the ductile reinforcing phase.

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Deformation measurement and In-situ observation of damage evolution behavior in environmental barrier coating system at high temperature

The Proceedings of the Materials and processing conference ◽

10.1299/jsmemp.2016.24.426 ◽

2016 ◽

Vol 2016.24 (0) ◽

pp. 426

Author(s):

Ryo INOUE ◽

Hideki KAKISAWA ◽

Yasuo KOGO

Keyword(s):

High Temperature ◽

Damage Evolution ◽

Deformation Measurement ◽

In Situ Observation ◽

Coating System ◽

Environmental Barrier ◽

Environmental Barrier Coating ◽

Barrier Coating ◽

Evolution Behavior

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In-situ observation of damage evolution and fracture in AlSi7Mg0.3 cast alloys

Engineering Fracture Mechanics ◽

10.1016/s0013-7944(99)00027-2 ◽

1999 ◽

Vol 63 (4) ◽

pp. 395-411 ◽

Cited By ~ 23

Author(s):

L.L Mishnaevsky ◽

N Lippmann ◽

S Schmauder ◽

P Gumbsch

Keyword(s):

Damage Evolution ◽

In Situ Observation ◽

Cast Alloys

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Damage Maps of Veneered Zirconia under Simulated Mastication

Journal of Dental Research ◽

10.1177/154405910808701210 ◽

2008 ◽

Vol 87 (12) ◽

pp. 1127-1132 ◽

Cited By ~ 40

Author(s):

J.-W. Kim ◽

J.-H. Kim ◽

M.N. Janal ◽

Y. Zhang

Keyword(s):

Damage Evolution ◽

Occlusal Surface ◽

Dental Composites ◽

In Situ Observation ◽

Damage Evaluation ◽

Incline Surface ◽

Transparent Glass ◽

Partial Cone ◽

Damage Maps

Zirconia-based restorations often fracture from chipping and/or delamination of the porcelain veneers. We hypothesized that veneer chipping/delamination is a result of the propagation of near-contact-induced partial cone cracks on the occlusal surface under mastication. Masticatory loading involves the opposing tooth sliding along the cuspal inner incline surface with an applied biting force. To test this hypothesis, we cemented flat porcelain-veneered zirconia plates onto dental composites and cyclically loaded them (contact–slide–liftoff) at an inclination angle as a simplified model of zirconia-based restorations under occlusion. In light of in situ observation of damage evolution in a transparent glass/zirconia/polycarbonate trilayer, post mortem damage evaluation of porcelain/zirconia/composite trilayers by a sectioning technique revealed that deep-penetrating occlusal surface partial cone fracture is the predominant fracture mode of porcelain veneers. Clinical relevance is discussed.

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