#PURE BENDING VS ELASTIC FLEXTURE CRACK#

Unlike the fiber-based models, the mesh models contain several points where many fibers converge, and therefore the corresponding distribution plots exhibit several peaks (they illustrate how many fibers cross each particular plane which explains why different values of strengths were obtained for different models).

4.14 roughly describes the locations of cracks obtained for each model and the corresponding numbers of intersecting fibers.

#PURE BENDING VS ELASTIC FLEXTURE CRACK#

These strength order could be explained by the number of fibers intersecting near the crack plane. Moreover, the specimens (FFs and FM) with functional reinforcements showed lower strength than the ones (RFs and RM) with no functional distribution.

The strengths of the RFs and FFs structures were lower than that of the control specimen which did not have any reinforcement inside on the other hand, the RM and FM specimens exhibited higher strengths compared to the control one. 4.13, the experimental responses of each type of specimens are plotted. Three-point bending tests were performed using an Instron 3369 instrument ( Fig. The experimental data were subjected to one-way analysis of variance using Tukey’s multiple comparison method to determine the significance of observed differences between sample means at the 95% confidence level ( α = 0.05). Water absorption and bulk density values were obtained from tested flexural specimens following the procedures specified in ASTM C 948–81 ( ASTM, 2000). The mechanical test procedures employed are described in greater detail by Savastano et al. For the purpose of this study, the toughness was measured as the fracture energy divided by specimen width and depth at the failure location. Fracture energy was calculated by integration of the load–deflection curve to the point corresponding to a reduction in load carrying capacity to 50% of the maximum observed. A span of 100 mm and a deflection rate of 0.5 mm/min were used for all tests in an Instron model 1185 testing machine. Three-point bending tests were performed for the determination of modulus of rupture (MOR), modulus of elasticity (MOE) and toughness.

Agopyan, in Sustainability of Construction Materials, 2009 3.5.3 Test methods Sustainability of vegetable fibres in construction

Pure bending vs elastic flexture