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H. Bai et alii, Frattura ed Integrità Strutturale, 56 (2021) 16-45; DOI: 10.3221/IGF-ESIS.56.02

content of rosin and add an appropriate amount of auxiliary regulator epoxide resin and polyamide. It has also been found that the addition of epoxide resin and polyamide to improve the fracture toughness of rock-like materials is better. To reduce the fracture toughness of brittle rock-like materials, the content of sand and barite in the raw materials should be increased, and an appropriate amount of auxiliary regulator silicone rubber can be added.

220

220

200

200

180

180

160

160

Elastic modulus (MPa)

Elastic modulus (MPa)

140

140

45

45

50

55

60

50

55

60

Sand content (%)

Barite content (%)

220

400

210

350

200

300

190

180

250

170

Elastic modulus (MPa)

Elastic modulus (MPa)

200

160

1.0

1.5

2.0

2.5

0.0

0.5

1.0

1.5

Rosin content (%)

Content of epoxide resin and polyamide (%)

210

200

190

180

170

160

150

140 Elastic modulus (MPa)

130

0.0

0.5

1.0

1.5

Silicone rubber content (%)

Figure 12: Relationships between raw materials contents and elastic modulus of brittle rock-like materials.

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