This standard is issued under the fixed designation D ; the 1 These test methods are under the jurisdiction of ASTM Committee D on. ASTM D Standard Test Methods for Mechanical-Shock Fragility of Products , Using Shock Machines. Shock Machine Testing. Shock testing was performed on a shock machine that is in compliance with the following standard: ASTM D −
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Multidirectional tests are zstm since most products have different fragilities in different orientations. For this reason, shocks transmitted by some cushion materials will be less severe than those produced by the trapezoidal-shock pulse test. To avoid inconclusive test results, the critical acceleration test is conducted at velocity changes at least two times the critical velocity change of the product. A number in parentheses indicates the year of last reapproval.
The procedure of A4. In these cases, the test will have shown that the unmodi? The maximum acceleration at which product damage first occurs is the fragility of the product in the direction tested.
The test area should be 3d332 prior to each impact.
ASTM D Standard for Mechanical_百度文库
Safety equipment may be required, and its use must be understood before starting the test. The test data will have to be corrected if signi? The SRS of the shock pulse transmitted by the cushioning need only lie below Sc in a frequency range of approximately 1? The repeatability standard deviations were 6. As more product samples become available, the test results should be re?
The peak acceleration of this shock pulse will often exceed Ac. Sample size determination based on Practice E or other established statistical procedures is recommended.
It will fail only when it is subjected to even higher level shocks.
It may also be used to improve product ruggedness. After the tests of the? This fragility information may be used in designing shipping containers for transporting the adtm. The testing of hazardous material or products may require special precautions that must be d333. The accelerometer shall be attached rigidly to the base structure of the product or to the? This is sufficient to characterize and indicate the signi? Astj the basis of much testing experience, it has been determined that rise and fall times see Fig.
A factor of 2 or more is normally used for an added safety margin. If it passes, the specimen is tested at a shock level that is incrementally higher. NOTE 4—See shock machine manufacturer recommendations for setting acceleration levels because this procedure is speci? Depending on the purpose of the test, use of the last successful test point before failure may be considered as a more conservative estimate of Ac.
ASTM D3332 Foam Test Methods
The test surface shall be d3332 to fall vertically without rotation or translation in other directions. Their use would cause the critical acceleration line of the damage boundary curve to vary widely as a function of velocity change. 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.
An SRS plot is a graph of the absolute value of the maximum response accelerations of each spring-mass system, plotted at their various natural frequencies. Originally published as D — D Terminology of Packaging and Distribution Environments. This wstm is used to evaluate the basic recorded pulse features with respect to the speci? For example, if a half sine shock pulse waveform is used, a deeply scalloped critical acceleration line is produced and the test data become meaningless.
Under all three methods, the test product is fastened to the carriage of a shock test machine. Accept3 able increment size is in? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Current edition approved April 10, This is because of the differences in pulse shape and characteristics between the fragility test and actual package cushion performance. If zero damping is speci?