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Residual stress effects on fatigue l...

Roberts, Jeffrey Lynn.

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Residual stress effects on fatigue life via the stress intensity parameter, K.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Residual stress effects on fatigue life via the stress intensity parameter, K./
作者:	Roberts, Jeffrey Lynn.
面頁冊數:	118 p.
附註:	Major Professor: John D. Landes.
Contained By:	Dissertation Abstracts International64-03B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086838

Residual stress effects on fatigue life via the stress intensity parameter, K.
Roberts, Jeffrey Lynn.

Residual stress effects on fatigue life via the stress intensity parameter, K. - 118 p.

Major Professor: John D. Landes.

Thesis (Ph.D.)--The University of Tennessee, 2002.

Residual stresses are known to have a significant effect on fatigue crack propagation and thus fatigue life. These effects have generally been quantified through an empirical approach, lending little help in the quantitative prediction of such effects. The weight function method has been used as a quantitative predictor, but its use neglects residual stress redistribution, treating the residual stress as a constant during crack growth. At least three different behaviors contribute to the redistribution of residual stress. First, residual stresses behind the crack tip are reduced to a negligible level as soon as the crack tip passes. Second, residual stress tends to redistribute away from the crack tip with crack growth, and third, crack growth results in an overall relaxation of residual stress.Subjects--Topical Terms:

1018410
Applied Mechanics.

Residual stress effects on fatigue life via the stress intensity parameter, K.
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035 $a (UnM)AAI3086838
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100 1 $a Roberts, Jeffrey Lynn. $3 1251013
245 1 0 $a Residual stress effects on fatigue life via the stress intensity parameter, K.
300 $a 118 p.
500 $a Major Professor: John D. Landes.
500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1458.
502 $a Thesis (Ph.D.)--The University of Tennessee, 2002.
520 $a Residual stresses are known to have a significant effect on fatigue crack propagation and thus fatigue life. These effects have generally been quantified through an empirical approach, lending little help in the quantitative prediction of such effects. The weight function method has been used as a quantitative predictor, but its use neglects residual stress redistribution, treating the residual stress as a constant during crack growth. At least three different behaviors contribute to the redistribution of residual stress. First, residual stresses behind the crack tip are reduced to a negligible level as soon as the crack tip passes. Second, residual stress tends to redistribute away from the crack tip with crack growth, and third, crack growth results in an overall relaxation of residual stress.
520 $a An alternative method for predicting the effect of a residual stress distribution on fatigue crack growth is herein developed. The stress intensity factor due to residual stress, K<sub>res</sub>, is characterized as the change in crack driving force due to the presence of the residual stress. This crack driving force is found through superposition of an applied stress and a residual stress, and subsequent manipulation of finite element strain energy and nodal displacement results.
520 $a Finite element modeling is carried out using a spatial distribution of non-uniform thermal expansion coefficients and a unit temperature load to simulate the desired residual stress. Crack growth is then achieved through use of a node release algorithm which sequentially removes nodal displacement constraint. The complete stress distribution, nodal displacements and internal strain energy are captured for each increment of crack growth, and from this information, knowledge of the stress intensity factor as a function of crack length is derived.
520 $a Results from these calculations are used in a fatigue crack growth model to predict fatigue lives. The fatigue life model involves cyclical analysis of crack growth increment based on knowledge of stress intensity factors resulting from applied and residual stress. The qualitative effects of residual stress predicted by this model agree with documented empirical results which show that compressive residual stress increases fatigue life, while tensile residual stress decreases fatigue life.
590 $a School code: 0226.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0346
690 $a 0548
710 2 0 $a The University of Tennessee. $3 1022026
773 0 $t Dissertation Abstracts International $g 64-03B.
790 $a 0226
790 1 0 $a Landes, John D., $e advisor
791 $a Ph.D.
792 $a 2002
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