Full
Outline
During testing low impedance materials (so-called soft materials) by a conventional split Hopkinson pressure bar (SHPB), the transmission strain pulse is too weak to be collected correctly. In addition, the soft material specimen will not deform homogeneously during the testing, which makes it impossible to get valid data. In this paper, a polyurethane foam material was tested by SHPB using a quartz transducer technique. The stress equilibrium in the specimen was monitored by quartz transducer mounted at two end faces of the specimen. Experimental results showed that the amplitude of transmitted signals were increased greatly. Meanwhile, we used a pulse-shaper technique to increase the rise time of the incident pulse, which could ensure stress equilibrium and homogeneous deformation in the specimen. Compressive stress-strain behaviors of the foam showed that there was little effects of strain rates on the material properties at strain-rate of 1 000~4 000 s-1.
27
7
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
