Porosity Effects on Mechanical Properties of 3D Random Fibrous Materials at Elevated Temperatures

Li, Datao; Yu, Wenshan; Xia, Wei; Fang, Qin‐Zhi

doi:10.1007/s10338-019-00134-2

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…Based on the standard of the American Society for Testing Material (ASTM E399-09), we designed the CT specimen ( Figure 2) [27] and obtained the fracture toughness J C from the elevated experiments. The CT specimens were prepared, along the TTT direction, in bulk 3D RF material [28]. Two prefabricated cracks with 25 and 20 mm lengths were created by a fresh razor blade.…”

Section: Compact Tension Specimenmentioning

confidence: 99%

Temperature Dependence of the Fracture Toughness JC of Random Fibrous Material

Li²,

2020

Applied Sciences

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The temperature dependence of the fracture toughness JC of a three-dimensional (3D) random fibrous (RF) material, with a porosity of 87% along the through-the-thickness (TTT) direction, was investigated using experiments and the finite element method (FEM) in this study. The temperature considered ranges from 299 to 1273 K. The experimental observations revealed the fracture toughness JC with crack length-to-width ratios of 0.4 and 0.5, which increased from 47.32 to 328.28 J/m2 and from 44.92 to 280.09 J/m2, respectively, as the temperature increased. Then, a 3D FE model, considering the meso-morphology characteristics of the 3D RF material, was developed to simulate a size-scaled compact tension (CT) specimen with a single edge crack. Using the elastic modulus and the fracture strength of the silica fibers at room temperature, we verified the effectiveness of the FE model, then predicted the fracture strength of the silica fibers and the bonding between the fibers at elevated temperatures. In addition, our developed FE model proved to successfully simulate the fracture toughness JC from 299 to 1273 K and reveal the deformation mechanism of the 3D RF material at different temperatures.

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Section: Compact Tension Specimenmentioning

confidence: 99%