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SHEAR STRESS CONCENTRATION NEAR THE ...

YANG, WEI.

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SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE./
Author:	YANG, WEI.
Description:	135 p.
Notes:	Source: Dissertation Abstracts International, Volume: 46-08, Section: B, page: 2721.
Contained By:	Dissertation Abstracts International46-08B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8519932

SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE.
YANG, WEI.

SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE. - 135 p.

Source: Dissertation Abstracts International, Volume: 46-08, Section: B, page: 2721.

Thesis (Ph.D.)--Brown University, 1985.

In chapter II, a general discussion of the thermal differential strain which results from film deposition from a melt is presented. Approximations of various degree are explored to depict the most important features of the deposition process.Subjects--Topical Terms:

1018410
Applied Mechanics.

SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE.
LDR:03281nam 2200289 a 45 001 928325
005 20110426
008 110426s1985 d
035 $a (UnM)AAI8519932
035 $a AAI8519932
040 $a UnM $c UnM
100 1 $a YANG, WEI. $3 1251786
245 1 0 $a SHEAR STRESS CONCENTRATION NEAR THE EDGE OF A THIN FILM DEPOSITED ON A SUBSTRATE.
300 $a 135 p.
500 $a Source: Dissertation Abstracts International, Volume: 46-08, Section: B, page: 2721.
502 $a Thesis (Ph.D.)--Brown University, 1985.
520 $a In chapter II, a general discussion of the thermal differential strain which results from film deposition from a melt is presented. Approximations of various degree are explored to depict the most important features of the deposition process.
520 $a This thesis embodies a systematic study of the shear stress concentration near the edge of a thin film attached to a deformable substrate.
520 $a Chapter I outlines the basic mechanical analysis for film deposition. An integral-differential equation, resembling the famous Prandtl equation in areodynamics, is derived to govern the film stretching force. The general structure suggests that the bonding shear stress exhibits a square root singularity at the film edge. The "sliding" stress intensity factor K(,s) characterizing this singularity is found to be proportional to the square root of film thickness.
520 $a Chapter III, IV and V are devoted to the solution techniques of the Prandtl equation. The simplest case of deposition of a slender, non-interactive and uniform film is attacked by means of Mellin transforms and the significant influence of the deposition process on nondimensional stress intensity factor k is revealed. The slenderness and film interaction effects are studied in chapter IV via a Chebyshev polynomial technique developed by Erdogan. The concept of critical slenderness is introduced in chapter V where the case of non-uniform film deposition is considered. Powerful methods originally developed in aerodynamics are invoked here to get closed form solutions for several film profiles.
520 $a Chapters VI and VII are devoted to discussion of research on more sophisticated film models, including effects of viscosity, creep and plasticity. For polymeric films, the stress intensity factor histories are traced for several different visco-elastic film models. Interesting phenomena, such as overshooting and thermally assisted relaxation, are discovered which greatly broaden our knowledge on the evolution of shear stress concentration. The maximum plastic strain which arises in elastic-plastic film deposition is studied in chapter VII. This plastic strain may serve as a pertinent critical quantity in considering deformation controlled failure.
520 $a The fictitious singular bonding stress near film edge is removed in the last chapter by admitting relative slip between the film and substrate. The extent and severity of this slipping are closely examined under different types of bonding stress history.
590 $a School code: 0024.
650 4 $a Applied Mechanics. $3 1018410
690 $a 0346
710 2 0 $a Brown University. $3 766761
773 0 $t Dissertation Abstracts International $g 46-08B.
790 $a 0024
791 $a Ph.D.
792 $a 1985
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8519932