ISSN:
1741-2765
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The in-plane deformation fields near a stationary crack tip for thin, single edge-notched (SEN) specimens, made from Plexiglas, 3003 aluminum alloy and 304 stainless steel, have been successfully obtained by using computer vision. Results from the study indicate that (a) in-plane deformations ranging from elastic to fully plastic can be obtained accurately by the method, (b) for U, $$\varepsilon _{xx} $$ and $$\varepsilon _{xy} $$ , the size of the HRR dominant zone is much smaller than forV and $$\varepsilon _{yy} $$ , respectively. Since these results are in agreement with recent analytical work, suggesting that higher order terms will be needed to accurately predict trends in the data, it is clear that the region where the first term in the asymptotic solution is dominant is dependent on the component of the deformation field being studied, (c) the HRR solution can be used to quantity $$\varepsilon _{yy} $$ only in regions where theplastic strains strongly dominate the elastic strain components (i.e., when $$\left| {\varepsilon _{yy}^{el} /\left. {\varepsilon _{yy}^{pl} } \right|} \right.〈 .03 - .05$$ ); forV, the HRR zone appears to extend somewhat beyond this region, (d) the displacement componentU does not have the HRR singularity anywhere within the measurement region for either 3003 aluminum or 304 SS. However, the displacement componentV agrees with the HRR slope up to the plastic-zone boundary in 3003 aluminum ( $$5{\text{ }}J/\sigma _0〈 r〈 2{\text{5 }}J/\sigma _0 $$ ) and over most of the region where measurements were obtained ( $$J/\sigma _0〈 r〈 8{\text{ }}J/\sigma _0 $$ ) in 304 SS and (e) the effects of end conditions must be included in any finite-element model of typical SEN specimen geometries to accurately calculate theJ integral and the crack-tip fields.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02325709
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