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Outline
The micro/macro fracture behavior of a polymer bonded explosive (PBX) material was experimentally studied using a semi-circular bend test and digital speckle correlation method (DSCM). Brittle fracture occurred when a semi-circular disc sample of PBX with a preset crack was compressed. The whole strain field and displacement vector plot were obtained using the DSCM, and the plane strain fracture toughness of PBX material was acquired. In addition, real time microscopic examination was conducted to observe the process of deformation and failure of PBX material under semi-circular bend test using a scanning electron microscope (SEM) equipped with a loading stage. The localized damage and its evolution in PBX were obtained by the DSCM, demonstrating possible fracture route of microcracks. The results indicate that DSCM technique is a valid and effective tool to study the deformation and fracture mechanisms of PBX.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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