کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
822182 1469569 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite – Part I: Manual infiltration
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite – Part I: Manual infiltration
چکیده انگلیسی

As a first step towards a new crack healing methodology for cyclic loading, this paper examines two promising crack-tip shielding mechanisms during fatigue of a microcapsule toughened epoxy. Artificial crack closure is achieved by injecting precatalyzed monomer into the crack plane to form a polymer wedge at the crack tip. The effect of wedge geometry is also considered, as dictated by crack loading conditions during infiltration. Crack-tip shielding by a polymer wedge formed with the crack held open under the maximum cyclic loading condition (Kmax) yields temporary crack arrest and extends the fatigue life by more than 20 times. Hydrodynamic pressure and viscous damping as a mechanism of crack-tip shielding are also investigated by injecting mineral oil into the crack plane. Viscous fluid flow leads to retardation of crack growth independent of initial loading conditions. The success of these mechanisms for retarding fatigue crack growth demonstrates the potential for in situ self-healing of fatigue damage.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Science and Technology - Volume 65, Issues 15–16, December 2005, Pages 2466–2473
نویسندگان
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