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huangguaha木虫之王 (文坛精英)
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3. Ring tensile test 3.1 The sections of pipe measuring about 15 mm in length shall have plane and smoothed ends and shall be at right angle to the pipe axis. To perform this test, the pipe sections are stretched in a tensile testing machine until fracture occurs using two pins with a diameter equal to at least three times the wall thickness of the pipe, see Figure 2.10. In the case of welded pipes, the specimen shall be placed in the tensile testing device in such a way that the welded seam lies at 90° to the direction of the tensile load. The rate of the pins may not exceed 5 mm/s. 4. Drift expanding test 4.1 To perform this test, a tapered drift is forced into the specimen until the outside diameter has increased to the prescribed value C for the product in question, see Figure 2.11. The length of the specimen and the taper angle β of the drift shall be as shown in the following Table. The intrusion rate of the taper may not exceed 50 mm/s. 5. Flanging test 5.1 To perform this test, a sample of pipe with a length L = 1,5 D is worked into a flange in the device shown in Figure 2.12 until the outer diameter C of the flange attains the value prescribed for the product. The radius r shall match that prescribed for the product. |
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3. 环拉伸试验 3.1 长度约15mm处的管截面应具有平而光滑的末端，应与管轴具有正确的角度。进行该试验，在拉伸测试机上用2个直径等于至少3倍管壁厚的销拉伸管截面直到发生断裂，见图2.10。对于焊接管，试件放置在拉伸测试机时应使焊缝与拉伸载荷方向保持90°。 销的速率不应超过5mm/s。 4. 扩口试验 4.1 进行该试验，将锥形扩孔器强行伸进试件，直到外径增加到产品规定的C值，见图2.11。试件的长度和扩孔器的锥角β如下表所示。锥体的进入速率不应超过50mm/s。 5. 翻边试验 5.1 进行该试验，在图2.12所示的装置将一个长度=1.5D的管样件加工成法兰，直到法兰的外径C达到产品的规定值。 半径r应符合产品规定。 |
2楼2014-07-10 10:12:14
