کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7169333 1463043 2017 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt joints
ترجمه فارسی عنوان
معیار شکست مکانیک از شروع کرک وابسته به زمان از ناحیه لبه رابط در اتصالات چسباننده لب به لب
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 90°/90°) was investigated in detail. With the change of applied stress level, σn, the butt joints exhibited crack initiation life, tC, that varied about four orders of seconds (102-106 s). Such a clear time-dependent life property was then studied in terms of the fracture mechanics. The near-edge stress/strain field at the crack initiation was numerically evaluated with the finite element method (FEM) by applying the time-hardening creep law to the epoxy resin. It was found that the critical asymptotic stress field along the interface represented by the combination of two parameters, λσcr (creep stress singularity index) and Kσcr (creep stress intensity factor), satisfies a unique relation irrespective of (σn, tC) sets. The same tendency was also confirmed when the near-edge total strain field parameters were employed. These results indicate that the K-λ criterion, originally developed for static fracture problems, still holds its validity in the time domain.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 186, December 2017, Pages 368-377
نویسندگان
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