کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
777034 1463813 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of crack nucleation in TA6V under fretting–fatigue loading using the potential drop technique
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Characterization of crack nucleation in TA6V under fretting–fatigue loading using the potential drop technique
چکیده انگلیسی

Crack initiation in a Ti–6Al–4V alloy was investigated experimentally in fretting fatigue conditions. A cylinder–plane geometry was used for the contact, and partial slip conditions were considered. The experiments were conducted on a new bi-actuator fretting fatigue machine and an original interrupted test expertise methodology was proposed. The potential drop technique is used to monitor crack nucleation. The careful calibration procedure used in this study and presented in this paper allowed the detection of cracks as small as 50 μm. Three experimental campaigns were conducted: fretting tests (optical expertise), fretting fatigue tests up to a lifetime of 100,000 cycles (optical expertise) and fretting fatigue interrupted tests (potential drop technique). The experiments have shown that the addition of a fretting–fatigue to conventional fretting conditions can induce a drop off of 45% of the tangential threshold for crack nucleation. Two mechanisms were shown to promote this drop off: increasing the fatigue load leads to a decrease of the tangential force nucleation threshold whereas raising the fretting load leads to a decrease of the nucleation and fracture fatigue lifetime.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 32, Issue 10, October 2010, Pages 1658–1668
نویسندگان
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