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Books > Professional & Technical > Mechanical engineering & materials > Mechanical engineering
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Lifetime Estimation of Welded Joints (Hardcover, 2008 ed.)
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Lifetime Estimation of Welded Joints (Hardcover, 2008 ed.)
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In the paper the author attempts to assess the fatigue life of
chosen welded joints. It focuses especially on chosen problems that
accompany deter- nation of the fatigue life of welded joints,
taking into consideration the strain energy density parameter.
Chapter 2 describes the welded joint as a stress concentrator. The
state of stress and strain in the notch are described and
theoretical and fatigue coefficients are indicated. The fatigue
coef- cient of the notch effect is estimated on the basis of
fictitious radius in the notch root. Chapter 3 presents a model of
fatigue life assessment under uniaxial stress state with
statistical handling of data presented. The new energy model of
fatigue life assessment, which rests upon the analysis of stress
and strain in the critical plane, is described in detail in chapter
4. The principle of such a description is presented in the uniaxial
as well as in - axial state of loading. Chapter 5 contains the
analysis of tests of four ma- rials subjected to different
loadings: cyclic, variable-amplitude with Ga- sian distribution,
and variable amplitude with Gaussian distribution and overloading
for symmetric and pulsating loading. The analysis is based on the
determined fatigue characteristics for all the considered
materials. Chapter 6 shows the application of the model in the
fatigue life assessment in the complex state of loading (bending
with torsion of flange-tube and tube-tube joints) based on fatigue
research of steel and aluminum welded joints carried out in
well-known German centres.
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