Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545182 |
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Title: | Fatigue crack initiation and propagation from defects in aluminium welds | ||||||
Author: | Woods, Peter |
ISNI:
0000 0004 2710 8740
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Awarding Body: | University of Aston in Birmingham | ||||||
Current Institution: | Aston University | ||||||
Date of Award: | 1976 | ||||||
Availability of Full Text: |
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Abstract: | |||||||
Fatigue crack initiation and propagation in aluminium butt
welds has been investigated. It is shown that the initiation of cracks
from both buried defects and from the weld reinforcement may be
quantified by predictive laws based on either linear elastio fracture
mechanics, or on Neuber's rule of stress and strain concentrations. The
former is preferable on the grounds of theoretioal models of crack tip
plasticity, although either may be used as the basis of an effective
design criteria against crack initiation. Fatigue lives fol1owing
initiation were found to follow predictions based on the integration of
a Paris type power law.
The effect of residual stresses from the welding operation on
both initiation and propagation was accounted for by a Forman type
equation.This incorporated the notional stress ratio produced by the
residual stresses after various heat treatments.
A fracture mechanics analysis was found to be useful in
describing the fatigue behaviour of the weldments at incrodsed.
temperatures up to 300°C. It is pointed out however, that the complex
interaction of residual stresses, frequency, and change in fracture
mode necessitate great caution in the application of any general design
criteria against crack initiation and growtn at elevated temperatures.
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Supervisor: | Not available | Sponsor: | Not available | ||||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||||
EThOS ID: | uk.bl.ethos.545182 | DOI: | Not available | ||||
Keywords: | Metallurgy | ||||||
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