Gardner Impact ASTM D, D Falling Dart Impact (Gardner Impact) ASTM D, ASTM D Scope: Falling dart impact, also known as Gardner. This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics. ASTM D Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen by Means of a Striker Impacted by a Falling Weight (Gardner Impact).

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The values given in parentheses are for information only.

Gardner Impact ASTM D, D

For example, in some cases incipient cracking in glass-reinforced polymers is difficult to differentiate from the reinforcing? In such cases, it is permissible to expose the stressed surface to a penetrating dye, such as gentian violet, to help determine the onset of cracking. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

If you feel that your 5d420 have not received a fair hearing you should d55420 your views known to the ASTM Committee on Standards, at the address shown v5420. Use one symbol, such as X, to indicate a failure and a different symbol, such as O, to indicate a nonfailure at each height level.

Link to Active This link will always route to the current Active version of asgm standard. Test each specimen only once. D — 04 NOTE 1—Depth of penetration when fully seated shall be Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.


However, the velocity of a free-falling object is a function of the square root of the drop height.

Raise the weight in the tube to the desired impact value, as shown on the appropriate scale, and release it so that the weight drops on the striker. Then test the second specimen. Through our d55420 of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world. A suggested design is given in Fig. Assurance Testing Inspection Certification.

Data in these tables are speci? A sample computation of sw is found in Appendix X1. D — 98a: The specimens shall be free of obvious imperfections, unless the imperfections constitute a variable under study.

NOTE 3—Such block dimensions conform to commercially d542 butcher block tables. Hagan, et al 2 found that the mean-failure energy of sheeting was constant at drop heights between 0.

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 to use.

Thus, use impact tests only to obtain relative rankings of materials.

The apparatus shall consist of the following: Be sure the specimen is? Machining specimens to reduce thickness variation is not permissible. Use of rubber mats either directly under the tester or supporting apparatus is prohibited.

Current edition approved February 1, D — Alternatively, affix testers directly to the? Refer to the example in Appendix X1.

Historical Version s – view previous versions of standard. Need help or have a question? Use a bracket to hold the tube in a vertical position by attaching it to the base and also to hold the hand knob, which is a pivot arm alignment for the striker, about 50 mm [2 in.


Certification Formally confirming that your products and services meet all trusted external and internal standards. Consider the end use environment and requirements when choosing from the available striker geometries.

Gardner Impact ASTM D4226, D5420

NOTE 5—Normally the specimen is not clamped because the test apparatus does not have provision for clamping. There is no known means for correlating the results of tests made by different methods or procedures.

Global Reach Intertek is the industry leader with over 42, people in d520, locations in over countries. The principles of The most common method to analyze this data is called the “Bruceton Staircase” method. The values given in brackets are for information only. If a test sample passes, the drop height is increased by one unit.

Therefore, factors including surface features? This geometry can be achieved by removing the removable support ast, on the standard Gardner instrument. Originally approved in However, the apparatus can be asym A superscript epsilon e indicates an editorial change since the last revision or reapproval.

ASTM D5420

Practice E to generate data speci? For each material, all samples ast, prepared at one source, but the individual specimens were prepared at the laboratories that tested them.

An “impactor” sits on top of the test sample with a nose of specified radius in contact with the center of the test sample.