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Outline
Dynamic calibration experiments of sandwich PVDF (Polyvinylide Fluoride) stress gauges have been investigated by split Hopkinson pressure bar (SHPB). Dynamic piezoelectricity of PVDF gauges has been discussed, including testing circuit, stress concentration effect of PVDF gauge surface, inherent characteristic and package of PVDF stress gauges and multi-impact effects on the testing signals. The stress uniformity state of rubber materials has been investigated by PVDF gauges. The results show that adjusting the testing resistance can improve the accuracy; increasing the PVDF gauge sensitive area can avoid the signal distortion caused by stress concentration; thermal-plastic characteristic and gauge package can cause the PVDF stress plate to vibrate less than real signal; multi-impact has influence on both the signal loading and unloading part, but when the gauge is un-damaged, the signal flat potion is similar to the real signal.
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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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