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Mechanical characterization of nanos...

University of Virginia.

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Mechanical characterization of nanoscale metal films on compliant substrates.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Mechanical characterization of nanoscale metal films on compliant substrates./
作者:	Scott, Orion Nathaniel.
面頁冊數:	157 p.
附註:	Adviser: Hilary Bart-Smith.
Contained By:	Dissertation Abstracts International69-04B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3312133
ISBN:	9780549599418

Mechanical characterization of nanoscale metal films on compliant substrates.
Scott, Orion Nathaniel.

Mechanical characterization of nanoscale metal films on compliant substrates. - 157 p.

Adviser: Hilary Bart-Smith.

Thesis (Ph.D.)--University of Virginia, 2008.

The mechanical response of metal/elastomer bilayers due to an applied strain is studied and the fracture results from experimental and theoretical analyses of a deformed metal/elastomer/metal multilayer are presented. The bilayers are stretched uni-axially and consist of 5mm thick silicone-based elastomer specimens coated with thin copper (125-600nm). The evolution of film cracking is monitored in-situ as a function of applied strain over &sim;30mm 2 as the specimen is deformed incrementally to &sim;10% strain. Plots reveal: (i) a proportional relationship between film thickness (h f) and crack spacing (L), (ii) an inverse relationship between the crack spacing normalized by film thickness ( L/hf) and the applied strain, and (iii) evidence of length scale affecting the fracture toughness of copper. Additionally, the impact of a nanoscale film on the effective stiffness of a composite layer is investigated using a novel test configuration. Metal/elastomer/metal membranes are deformed using an instrumented spherical indenter having dimensions comparable to the freestanding span. The load-displacement measurements are used with closed-form solutions for membrane deflection to determine the effective plane-strain modulus of cracked multilayers. The membrane uses an elastomer an order of magnitude thinner than the bilayer experiments, thus comparison of the two test configurations reveal that the ratio of crack spacing to substrate thickness is a parameter which indicates how a multilayer behaves during deformation. Fracture toughness estimates for both specimen geometries are provided using cracking models that relate crack spacing, imposed strain and the energy release rate governing channel crack formation. The critical energy release rate (Gc) varies from 0.15 kJ/m2 to 3 kJ/m2 depending on the specimen geometry, however, the uni-axial specimen falls outside of a regime where the theoretical model is fully applicable. Therefore, the estimates are not quantitative measurements but order of magnitude estimates that are below bulk Cu values of Gc&sim;7-65 kJ/m2.

ISBN: 9780549599418Subjects--Topical Terms:

1018410
Applied Mechanics.

Mechanical characterization of nanoscale metal films on compliant substrates.
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502 $a Thesis (Ph.D.)--University of Virginia, 2008.
520 $a The mechanical response of metal/elastomer bilayers due to an applied strain is studied and the fracture results from experimental and theoretical analyses of a deformed metal/elastomer/metal multilayer are presented. The bilayers are stretched uni-axially and consist of 5mm thick silicone-based elastomer specimens coated with thin copper (125-600nm). The evolution of film cracking is monitored in-situ as a function of applied strain over &sim;30mm 2 as the specimen is deformed incrementally to &sim;10% strain. Plots reveal: (i) a proportional relationship between film thickness (h f) and crack spacing (L), (ii) an inverse relationship between the crack spacing normalized by film thickness ( L/hf) and the applied strain, and (iii) evidence of length scale affecting the fracture toughness of copper. Additionally, the impact of a nanoscale film on the effective stiffness of a composite layer is investigated using a novel test configuration. Metal/elastomer/metal membranes are deformed using an instrumented spherical indenter having dimensions comparable to the freestanding span. The load-displacement measurements are used with closed-form solutions for membrane deflection to determine the effective plane-strain modulus of cracked multilayers. The membrane uses an elastomer an order of magnitude thinner than the bilayer experiments, thus comparison of the two test configurations reveal that the ratio of crack spacing to substrate thickness is a parameter which indicates how a multilayer behaves during deformation. Fracture toughness estimates for both specimen geometries are provided using cracking models that relate crack spacing, imposed strain and the energy release rate governing channel crack formation. The critical energy release rate (Gc) varies from 0.15 kJ/m2 to 3 kJ/m2 depending on the specimen geometry, however, the uni-axial specimen falls outside of a regime where the theoretical model is fully applicable. Therefore, the estimates are not quantitative measurements but order of magnitude estimates that are below bulk Cu values of Gc&sim;7-65 kJ/m2.
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