Stress intensity factor against fracture toughness in functionally graded geopolymers

• Autorzy: Nazari, A. , Sanjayan, J. G.
• Języki publikacji: EN

Abstrakty

EN

The benefits of producing functionally graded geopolymer in terms of their modified stress intensity factor and fracture toughness are discussed in the present paper. Pre-notched functionally graded geopolymer beams were fabricated by two different fly ash-based geopolymer mixtures. The load was applied parallel to the functionally graded region; two different structures were evaluated by changing the position of the notch. The obtained results indicated that the crack nucleation and growth depend on the interaction between stress intensity factor and fracture toughness. According to the notch position, a crack experience upward or downward variations of properties. When the crack is located in the mixture with the lowest toughness, the variation of properties is called upward and vice versa. A crack facing an upward fracture toughness region is arrested, when the applied stress is equal to the weakest strength of the constituent materials. On the other hand, the fracture toughness of a crack facing a downward fracture toughness gradient is more than that facing an upward one, without any subsequent arresting. It was shown that the position of the notch, and experiencing of downward or upward gradient in mechanical properties mainly determine the final flexural strength of the specimens.

Słowa kluczowe

PL

geopolimery; odporność na pękanie; modelowanie analityczne; naprężenia

EN

geopolymers; fracture toughness; analytical modelling; stress intensity factor

• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2015
• Tom: Vol. 15, no. 4
• Strony: 1007--1016
• Opis fizyczny: Bibliogr. 35 poz., wykr.

Twórcy

autor

Nazari, A.

• Centre for Sustainable Infrastructure, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria 3122, Australia,

autor

Sanjayan, J. G.

• Centre for Sustainable Infrastructure, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria 3122, Australia

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Identyfikatory

DOI

10.1016/j.acme.2015.06.005