Fracture energy for three point bend tests on single edge notched beams: Proposed evaluation

Malvar, L. J.; Warren, G. E.

doi:10.1007/bf02472495

Cited by 16 publications

(1 citation statement)

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“…• Fracture of concrete tends to be brittle • The strength of concrete depends on the loading rate [10] • The tensile strength of concrete is about 1/10 of its compressive strength [7] • Concrete and mortar are notch-sensitive The compliance approach: One of the useful LEFM models developed for concrete is the compliance approach. This approach relates the displacement of the concrete element to the load applied through a linear relation using the cracked body stiffness or Compliance as shown in Eq.…”

Section: Linear Elastic Fracture Mechanics (Lefm)mentioning

confidence: 99%

Characterization of the Tenacity of the Concrete Mortars Exposed to Elevated Temperatures

Djaknoun¹

2009

American Journal of Applied Sciences

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Abstract:The main objective of this research was the characterisation of the fracture toughness of concrete mortars exposed to high temperatures by using notched specimens in three point bending tests. The specimens have different lengths and were heated at different temperatures ranging from room temperature up to 900°C. The experimental test results obtained are closed with those reported by the literature, it shows that beyond approximately 300°C, the fracture loads decrease strongly with the rise in heating temperature. However, between the room temperature (25°C) and 300°C, we recorded an increase of the fracture load. Two methods using the experimental critical load were applied to calculate the fracture toughness of concrete mortars: an analytical method based on the mechanics of continuous medium theory and a numerical approach using finite elements method. The numerical modelling has then been validated, discussed and compared with analytical solution. Comparison between the experimental results and the theory predictions was quite good.

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Section: Linear Elastic Fracture Mechanics (Lefm)mentioning

confidence: 99%