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Boundary effect model for size effect on fracture of quasi-brittle materials

หน่วยงาน Central Queensland University, Australia

รายละเอียด

ชื่อเรื่อง : Boundary effect model for size effect on fracture of quasi-brittle materials
นักวิจัย : Hu, Xiaozhi. , Duan, Kai.
คำค้น : Concrete. , Strength of materials. , Fracture mechanics. , Building materials. , Engineering. , Strategic basic research. , 861001 Cement and Concrete Materials. , 090503 Construction Materials. , 091308 Solid Mechanics. , 091599 Interdisciplinary Engineering not elsewhere classified. , Size effect -- Boundary effect -- Specific fracture energy -- Toughness -- Nominal strength
หน่วยงาน : Central Queensland University, Australia
ผู้ร่วมงาน : -
ปีพิมพ์ : 2548
อ้างอิง : http://hdl.cqu.edu.au/10018/40315 , cqu:5151
ที่มา : Hu, X & Duan, K 2005, 'Boundary effect model for size effect on fracture of quasi-brittle materials', Bridging Materials and Structures: Proceedings of ConMat '05, Third International Conference Construction Materials: Performance, Innovations and Structural Implications , Vancouver, Canada, 22-24 August , 2005, pp.1-10.
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Bridging Materials and Structures : Proceedings of ConMat '05, Third International Conference : Construction Materials: Performance, Innovations and Structural Implications, Vancouver, Canada, 22-24 August , 2005. Vancouver, Canada. : The University of British Columbia, 2005. p. 1-10 10 pages Refereed 9780888658104 , ACQUIRE [electronic resource] : Central Queensland University Institutional Repository.
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Size effects on the specific fracture energy GF and the nominal strength σN of notched concrete specimens are studied together in this paper. The size independent GF for very large specimens is compared with the asymptotic limit of the fracture energy predicted by size effect models using σN. This comparison provides a useful assessment on the validity of different size effect models as it is known that the asymptotic limit of GF for very large specimens is a size-independent material constant and is higher than the size dependent GF measured from small specimens. The size effect model presented in this study considers the influence of specimen boundaries and shows that specimen boundary conditions can significantly influence the quasi-brittle fracture behaviour of concrete, which is responsible for the apparent size effect. It is shown that the controlling factor for the size effect is the ratio of crack versus crack-tip fracture process zone, or un-cracked ligament versus the fracture process zone, whichever is smaller, rather than the specimen size. Experimental results available in the literature are used to substantiate this size effect mechanism.

บรรณานุกรม :
Hu, Xiaozhi. , Duan, Kai. . (2548). Boundary effect model for size effect on fracture of quasi-brittle materials.
    กรุงเทพมหานคร : Central Queensland University, Australia.
Hu, Xiaozhi. , Duan, Kai. . 2548. "Boundary effect model for size effect on fracture of quasi-brittle materials".
    กรุงเทพมหานคร : Central Queensland University, Australia.
Hu, Xiaozhi. , Duan, Kai. . "Boundary effect model for size effect on fracture of quasi-brittle materials."
    กรุงเทพมหานคร : Central Queensland University, Australia, 2548. Print.
Hu, Xiaozhi. , Duan, Kai. . Boundary effect model for size effect on fracture of quasi-brittle materials. กรุงเทพมหานคร : Central Queensland University, Australia; 2548.