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关于IzOd 冲击强度的不同测试方法和单位换算


关于 IzOd 冲击强度的不同测试方法和单位换算

Izod Impact Testing (Notched Izod) ASTM D256 and ISO 180 1.Scope: Notched Izod Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Izod impact is defined as the kinetic energy nee ded to initiate fracture and continue the fracture until the specimen is broken. Izod specimens are notched to prevent deformation of the specimen upon impact. This t est can be used as a quick and easy quality control check to determine if a mater ial meets specific impact properties or to compare materials for general toughness. 2.Test procedure: The specimen is clamped into the pendulum impact test fixture with the notched si de facing the striking edge of the pendulum. The pendulum is released and allowe d to strike through the specimen. If breakage does not occur, a heavier hammer is used until failure occurs. Since many materials (especially thermoplastics) exhibit l ower impact strength at reduced temperatures, it is sometimes appropriate to test materials at temperatures that simulate the intended end use environment 3.Reduced Temperature Test procedure: The specimens are conditioned at the specified temperature in a freezer until they reach equilibrium. The specimens are quickly removed, one at a time, from the fre ezer and impacted. Neither ASTM nor ISO specify a conditioning time or elapsed ti me from freezer to impact - typical values from other specifications are 6 hours of conditioning and 5 seconds from freezer to impact. 4.Specimen size: The standard specimen for ASTM is 64 x 12.7 x 3.2 mm (2? x ? x 1/8 inch). Th e most common specimen thickness is 3.2 mm (0.125 inch), but the preferred thick ness is 6.4 mm (0.25 inch) because it is not as likely to bend or crush. The depth under the notch of the specimen is 10.2 mm (0.4 inches). The standard specimen for ISO is a Type 1A multipurpose specimen with the end tabs cut off. The resulting test sample measures 80 x 10 x 4 mm. The depth unde r the notch of the specimen is 8mm 5.Data: ASTM impact energy is expressed in J/m or ft-lb/in. Impact strength is calculated b y dividing impact energy in J (or ft-lb) by the thickness of the specimen. The test r esult is typically the average of 5 specimens. ISO impact strength is expressed in kJ/m2. Impact strength is calculated by dividin g impact energy in J by the area under the notch. The test result is typically the a verage of 10 specimens. The higher the resulting number, the tougher the material. 看完之后,以前的 J/M 和 KJ/M2 的单位换算总算清楚了,如果不考虑别的因素,单从厚度 上考虑,ISO 是除以截面积,而 ASTM 是除以厚度,ASTM 除掉缺口后的宽度是 10.2MM, 那两者单位的换算就是 J/M 除以 10.2 后就是 KJ/M2 ,当然这个不考虑样条不同的影响。


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