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绝缘材料知识(7)  棉绸绝缘材料

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棉绸是人们日常生活的必需品,用棉布和丝绸制作的衣服、被褥等具有很好的透气性、吸湿性和保暖性,深受人们的喜爱。然而棉绸也是应用最早且目前仍在广泛应用的电工绝缘材料。以棉布和丝绸为基材的绝缘漆布和漆绸,可作一般电机、电器的绝缘,其特点是力学强度

ASTMD790增强与未增强塑料及电绝缘材料弯曲性能的试验方

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are especially useful for quality control and speci?cation purposes. 5.2 Materials that do not fail by the maximum strain allowed under these test methods (3-point bend) may be more suited to a 4-point bend test. The basic difference between the two test methods is in the location of the maximum bending moment and maximum axial ?ber stresses.The maximum axial ?ber stressesoccur on a line under th

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