کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7172312 | 1463770 | 2014 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A three-dimensional analysis of fatigue crack paths in thin metallic sheets
ترجمه فارسی عنوان
یک تجزیه و تحلیل سه بعدی از راه های ترک خستگی در ورق های فلزی نازک
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
Fatigue crack growth in thin sheets of 7075 T651 aluminium alloy and S355 steel were characterised in 3D, using crack front markings and topographic reconstructions of fracture surfaces. Tests performed in air or in salt water produced different crack paths for similar mechanical conditions, shear lips being reduced by corrosive environment, in the aluminium alloy as well as in the steel. Before the onset of shear lips development, tunnelling crack fronts were observed, due to the difference in closure effects at mid-thickness and near free surfaces. Tunnelling was progressively reduced and cancelled as slanted crack growth developed, even though ÎKI was reduced locally by crack twisting. This indicates a significant contribution of shear modes to the crack driving force, even though mode I striations are present in slanted zones. Elastic three-dimensional X-FEM computations were performed to analyse the observed crack growth kinetics, based on ÎKI, ÎKII and ÎKIII. The crack growth rates correlated much better to ÎKeq=ÎKI2+ÎKII2+ÎKIII2(1-ν) than to ÎKI. Elastic-plastic finite element simulations and the local application of a fatigue criterion with an amplitude-dependent critical plane were found to capture qualitatively the transition in fracture mode and its inhibition by side grooves.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 62, May 2014, Pages 119-132
Journal: International Journal of Fatigue - Volume 62, May 2014, Pages 119-132
نویسندگان
J.B. Esnault, V. Doquet, P. Massin,