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Outline
In the paper, aiming at the problems existing in the tank floor flaw detection, it is proposed to take nondestructive testing for tank floor by using shear wave probe exciting ultrasonic guided-wave. Ultrasonic guided wave as a new nondestructive testing method, has solved the difficulties in the detection of tank floor defects in China to a great extent. The paper explains the basic concept of guided waves, analyzes the feasibility of nondestructive flaw detection for tank floor by using shear wave probe exciting ultrasonic guided-wave, and determines the parameters and characteristics of using shear wave probe exciting ultrasonic guided-wave. ANSYS is used to make fem simulation of guided wave tank floor defect detection, and the conclusion that SH0 mode guided wave can be excited by using shear wave probe and the defect can be detected are obtained.
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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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