کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1473950 991070 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling damage and creep crack growth in structural ceramics at ultra-high temperatures
ترجمه فارسی عنوان
آسیب های مدل سازی و رشد ترک خزش در سرامیک های ساختمانی در دماهای بسیار بالا
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

A continuum damage model based on multiaxial ductility exhaustion of accumulated creep strains is proposed to predict creep crack growth (CCG) in structural ceramics at ultra-high temperatures where it is known that power law creep operates. The paper focuses on monolithic ZrB2 ultra-high temperature ceramic (UHTC), for which a reasonable set of material creep data is available. The predominant deformation mechanism shown by ZrB2 at temperatures greater than 1800 K and at stresses above 200 MPa is power law creep. Using the creep constitutive properties that have been found for this material, the proposed methodology is applied to a representative three-point bend geometry, which is planned to be tested. Relevant Fracture Mechanics parameters such as stress intensity factor, K, and steady state creep parameter, C*, are evaluated and compared with available models. In this way the essential properties required to develop predictive damage simulations are investigated, underlining the importance of having accurate material test data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 11, September 2014, Pages 2799–2805
نویسندگان
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