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Microtensile testing and cyclic defo...

Barbosa, Nicholas, III.

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Microtensile testing and cyclic deformation of freestanding aluminum thin films.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Microtensile testing and cyclic deformation of freestanding aluminum thin films./
作者:	Barbosa, Nicholas, III.
面頁冊數:	166 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1660.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167047
ISBN:	0542024861

Microtensile testing and cyclic deformation of freestanding aluminum thin films.
Barbosa, Nicholas, III.

Microtensile testing and cyclic deformation of freestanding aluminum thin films. - 166 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1660.

Thesis (Ph.D.)--Lehigh University, 2005.

Although the fatigue properties of bulk materials are well characterized for most materials, the implications of reducing the size scale of cyclically strained members to thicknesses on the order of single grains are not well defined. In this work, the cyclic deformation properties of 1 mum Al thin films are investigated. The fatigue test structures, the uniaxial load frame, the associated electronics, and the data acquisition and control software were all custom designed and fabricated in order to evaluate the monotonic and cyclic properties of thin metallic films. Test structures are 600 mum long x 100 mum wide x 1 mum thick. Monotonic tests were performed at a displacement rate of 5 mum/s and samples were pulled to failure. A value for the Young's modulus of the Al beams was determined to be 63.0 GPa +/- 5.1 GPa. The 0.2% yield stress was found to be 314.3 MPa +/- 45.2 MPa, the ultimate tensile strength was found to be 347.1 MPa +/- 56.3 MPa, and the average elongation was found to be 1.3% +/- 0.5%. Monotonic failures occurred through an oblique fracture. Fatigue tests were performed on the test structures under total strain amplitude control. Samples were fatigue under tension-tension conditions with strain amplitudes from 0.08% to 0.34%. The Al thin films were found to follow a Coffin-Manson relationship with a fatigue ductility coefficient of 0.022 and a fatigue ductility exponent of -0.278. Film fatigue fracture surfaces were similar in nature to bulk tension-tension fatigue, with the presence of slip offsets. The behavior of the 1 mum Al freestanding films, both in the monotonic and fatigue testing, was very similar to the fatigue properties of bulk materials when the significantly smaller sample grain size was considered.

ISBN: 0542024861Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Microtensile testing and cyclic deformation of freestanding aluminum thin films.
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