塑料相干测试简介(国外英文资料).docVIP

塑料相关测试简介(国外英文资料) General introduction of plastic test method Tensile strength and tensile modulus ASTM D 638, ISO R527, DIN 53455, DIN53457 Understanding how the material responds to the load is the basis for understanding the performance of the material. By testing the deformation degree of the material under certain stress, the designer can predict the application of the material in its working environment (figure 1). FIG. 1 tensile stress-strain curve A: the limit of elastic deformation B: the yield point C: the biggest strength O-a: the yield area, where elastic deformation occurs More than A: plastic deformation Figure 2: ASTM D 6, stretching the sample size Modulus, stress/strain Mpa Yield stress: stress Mpa, which begins to have plastic deformation The stress Mpa is when the rupture stress occurs The strain % of the rupture of the elongation material of the fracture The elastic limit begins where the elastic deformation ends The modulus of elasticity occurs in the modulus of Mpa when plastic deformation occurs Test the speed: A speed: 1mm/mm tensile modulus B speed: the tensile stress/strain of 5mm/mm filling material C speed: 50mm/mm for the tensile stress/strain of filling material Bending strength and bending modulus ASTM D 790, ISO 178, DIN 53452 Bending strength is the ability to measure material resistance to flexure deformation or to test material rigidity. Unlike the stretching load, all stress loads in one direction when the test is bent. The pressure head is pressed in the center of the sample to form a 3 point load, and the constant compression speed is 2mm/mm on the standard tester. The compressive load - deformation curve, which is collected by computer, is calculated to calculate the modulus of compression. At least five points of load and deformation in the linear region of the curve. Bending modulus (ratio of stress and strain) is an important indicator of the bending performance of the material. Compression modulus is the ratio of compressiv