Charpy for ASTM D and ASTM D Testing and Izod Impact Testers for ASTM D, ASTM D and ASTM E23 Testing. ASTM D defines the method used to determine the resistance of plastic to breakage when impacted in a three point bend configuration, using a pendulum. ASTM D is used to determine the resistance of plastics to breakage by flexural shock as indicated by the energy extracted from standardized pendulum type.
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ASTM D Charpy Impact of Notched Specimens of Plastics – ASTM – United Test
Active view current version of standard. This test method requires specimens to be made with a milled notch see Note 2.
The notch produces a stress concentration which promotes a brittle, rather than a ductile, fracture. The results of this test method are reported in terms of energy absorbed per unit of specimen width see Note 3. Note 1—The machines with pendulum-type hammers have been standardized in that they must comply with certain requirements including a fixed height of hammer fall, which results in a substantially fixed velocity of the hammer at the moment of impact.
Hammers of different initial energies produced by varying their effective weightshowever, are recommended for use with specimens of d61110 impact resistance. Moreover, manufacturers of the equipment are permitted to use different lengths and constructions of pendulums with possible differences in pendulum rigidities resulting see Section 5. Be aware that sstm differences in machine design do exist. Note 2—The specimens are standardized in that they have a fixed length and fixed depth, however, the width of the specimens is permitted to vary between limits.
ASTM D Charpy Impact Resistance of Notched Specimens of Plastics
One design of milled notch is allowed. The notch in the specimen serves to concentrate the stress, minimize plastic deformation, and direct the fracture to the part of asfm specimen behind the notch.
Scatter in energy-to-break is thus reduced. Because of differences in the elastic and viscoelastic properties of plastics, however, response to a given notch varies among materials.
Note 3—Caution must be exercised in interpreting d1610 results of this test method. The following testing parameters have been shown to affect test results significantly: It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior s6110 use.
Note 4—This standard resembles ISO in title only. The content is significantly different. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.