A microindentation method for estimating interfacial shear strength and its use in studying the influence of titanium transition layers on the interface strength of epitaxial copper films on sapphire

1997 ◽  
Vol 45 (2) ◽  
pp. 489-499 ◽  
Author(s):  
G. Dehm ◽  
M. Rühle ◽  
H.D. Conway ◽  
R. Raj
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Interface Strength ◽  
Interfacial Shear ◽  
Copper Films ◽  
Transition Layers

Measurement of the Interfacial Shear Strength of thin Copper Films on Sapphire by Microindentation Experiments

1995 ◽  
Vol 403 ◽  
Author(s):  
G. Dehm ◽  
R. Raj ◽  
M. Rühle
Keyword(s):  
Shear Strength ◽  
Molecular Beam ◽  
Interfacial Shear Strength ◽  
Interfacial Strength ◽  
Interfacial Shear ◽  
Copper Films ◽  
Sapphire Substrates ◽  
Metal Ceramic ◽  
Relative Change ◽  
Ceramic Interfaces

AbstractMicroindentation experiments were carried out on 500 nm thick films of copper grown on sapphire substrates, containing titanium interlayers of different thicknesses. The films were near single crystal and were grown by molecular beam epitaxy. The width of the titanium interlayers was varied from 0.7nm to I 10nm. The load-displacement data obtained from the indentation experiments was analyzed in terms of a new model. Just 0.7nm of titanium produced a 40% increase in the interfacial shear strength. Further increase in the thickness of the titanium interlayers produced only a slightly larger increase in the interfacial strength, suggesting that the measurement reflected the influence of the atomic bonding at the interface. The technique and the model present a simple way to estimate the relative change in the interfacial strength of metal-ceramic interfaces.

Effect of Morphology of ZnO Nanowire Arrays on Interfacial Shear Strength in Carbon Fiber Composites

2009 ◽  
Vol 1174 ◽  
Author(s):  
Ulises Galan ◽  
Gregory Ehlert ◽  
Yirong Lin ◽  
Henry Angelo Sodano
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Interfacial Shear Strength ◽  
Nanowire Array ◽  
Interface Strength ◽  
Interfacial Shear ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Aspect Ratios ◽  
Zno Nanowire Arrays

AbstractZnO nanowire arrays are grown on carbon fiber to enhance the interface strength of a polymer matrix composite without degrading the base fiber and in-plane strength of the composite. The morphology of the nanowire array is controlled during growth to create nanowires with different aspect ratios to elucidate the structure-property relations of the interphase. Nanowires are shown to double the composite interfacial shear strength at an intermediate nanowire length, indicating that an optimal point exists and the interface can be engineered to maximize the interfacial enhancement. Furthermore, the observed effect of the morphology on interface strength indicates that the bond between the ZnO nanowire array and the carbon fiber is quite strong, more than twice as strong as the interaction between the matrix and control fiber.

Revision of Cemented Fixation and Cement—Bone Interface Strength

1992 ◽  
Vol 206 (1) ◽  
pp. 47-49 ◽  
Author(s):  
A Rosenstein ◽  
W MacDonald ◽  
A Iliadis ◽  
P McLardy-Smith
Keyword(s):  
Shear Strength ◽  
Bone Cement ◽  
Interfacial Shear Strength ◽  
Interface Strength ◽  
Interfacial Shear ◽  
Bone Fixation ◽  
Pmma Bone Cement ◽  
Joint Arthroplasties ◽  
Pmma Cement ◽  
Push Out

Interfacial shear strength between poly(methyl methacrylate) (PMMA) bone cement and cancellous bone was measured in bone samples from human proximal femora. Samples were prepared with fresh cement-bone, fresh cement inside a mantle of existing cement and with fresh cement-revised bone surfaces. Push-out tests to measure shear strength caused failure only at bone-cement interfaces; revised bone interfaces were 30 per cent weaker (P < 0.02) than primary interfaces. The clinical relevance is that revision of cemented joint arthroplasties may necessitate removal of components with sound cement-bone fixation. The practice of removing all traces of PMMA cement may not yield the optimal fixation; adhesion of fresh cement to freshly prepared surfaces of the existing cement might also be considered where circumstances are favourable.

scholarly journals Enhanced Interfacial Shear Strength and Critical Energy Release Rate in Single Glass Fiber-Crosslinked Polypropylene Model Microcomposites

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2552 ◽  
Author(s):  
Uwe Gohs ◽  
Michael Mueller ◽  
Carsten Zschech ◽  
Serge Zhandarov
Keyword(s):  
Shear Strength ◽  
Electron Beam ◽  
Energy Release Rate ◽  
Glass Fiber ◽  
Release Rate ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Critical Energy ◽  
Interfacial Shear ◽  
Critical Energy Release Rate

Continuous glass fiber-reinforced polypropylene composites produced by using hybrid yarns show reduced fiber-to-matrix adhesion in comparison to their thermosetting counterparts. Their consolidation involves no curing, and the chemical reactions are limited to the glass fiber surface, the silane coupling agent, and the maleic anhydride-grafted polypropylene. This paper investigates the impact of electron beam crosslinkable toughened polypropylene, alkylene-functionalized single glass fibers, and electron-induced grafting and crosslinking on the local interfacial shear strength and critical energy release rate in single glass fiber polypropylene model microcomposites. A systematic comparison of non-, amino-, alkyl-, and alkylene-functionalized single fibers in virgin, crosslinkable toughened and electron beam crosslinked toughened polypropylene was done in order to study their influence on the local interfacial strength parameters. In comparison to amino-functionalized single glass fibers in polypropylene/maleic anhydride-grafted polypropylene, an enhanced local interfacial shear strength (+20%) and critical energy release rate (+80%) were observed for alkylene-functionalized single glass fibers in electron beam crosslinked toughened polypropylene.

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