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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Maximum-faired acceleration level of the? Unit or consumer packages, which are transported within an outer container, are considered to be the product for the purposes of these test methods.
Most products are not affected by this multiplicity of tests. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? It is the responsibility of d3323 user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Two test methods are outlined, as follows: The damage boundary of v3332 trapezoidal-shock pulse envelops damage boundaries produced by other waveforms. A number in parentheses indicates the year of last reapproval.
If astk passes, the specimen is tested at a shock level that is incrementally higher. This amplitude is used to evaluate the basic recorded pulse features with respect to the speci?
As more product samples become available, the test results should be re? NOTE 4—See shock machine manufacturer recommendations for setting acceleration levels because this procedure is speci? The product should be supported by a?
Operating personnel must therefore remain alert to potential hazards and take necessary safety precautions. Common practice is to de? The repeatability standard deviations were 6.
That is, it may be possible to design the cushion to transmit a somewhat higher acceleration yet still not cause damage to the product. Government Printing Office,pp. This is because of the differences in pulse shape and characteristics between the fragility test and actual package cushion performance. The maximum acceleration at which product damage first occurs is the fragility of the product in the direction tested.
Several specimens are tested sequentially, with the test specimen being discarded or repaired after each individual shock test. D Terminology of Packaging and Distribution D3332. The testing of hazardous material or products may require special precautions that must ashm observed.
This fragility information may be used in designing shipping containers for transporting the products. It will fail only when it is subjected to even higher level shocks. Then, when the carriage is dropped, the product is examined for product damage. However, some products will fail prematurely due to cumulative effects.
ASTM D3332 Foam Test Methods
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. For a product of this type, it is important to determine the probable number of shocks that it will be subjected to in shipment.
The machine is set to attain a velocity change which exceeds the minimum required to damage the product, but at a very low acceleration level. 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. Accept3 able increment size is in? Method C is used for relatively rugged low fragility products that may not need cushioning. In other frequency regions the cushion SRS may exceed Sc.
Therefore, the test in accordance with Test Method B 9.
ASTM D Standard for Mechanical_百度文库
Sample size determination based on Practice E or other established statistical procedures is recommended. Site design by Softnet. Calculation that assumes the shock pulse to be a perfect geometric? Failure occurred in the seventh test, establishing the vertical critical velocity change line midway between the sixth and seventh test levels see 9.
Failure occurred in the fourteenth test, establishing the horizontal critical acceleration line Ac midway between astk thirteenth and fourteenth test levels see 9. If the product is complex, usually some sub-element of the product will fail? If zero damping is speci?