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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Pulse durations as short as 0. For a given product, the interrelation of these three parameters is shown by damage boundary, as plotted in Fig. The peak acceleration of this shock pulse will often exceed Ac. Acceptable increment size is in?
Current edition approved April 10, A factor of 2 or more is normally used for an added safety margin. The procedure of A4. Operating personnel must therefore remain alert to aztm hazards and take necessary safety precautions. The damage boundary of a trapezoidal-shock pulse envelops damage boundaries produced asrm other waveforms. For most products, the damage boundary will be different for each direction in which the shock occurs.
In other frequency regions the cushion SRS may exceed Sc. The accelerometer is fastened to the carriage in this case, and a rigid mass weighing the same as the product is subjected to a series of shock pulses. D Terminology of Packaging and Distribution Environments.
ASTM D3332 Foam Test Methods
Method B is used when drop heights are known with great certainty. For this reason, shocks transmitted by some cushion materials will be less severe than those produced by the trapezoidal-shock pulse test. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Two test ast, are outlined, as follows: This fragility information may be used in designing shipping containers for transporting the products.
The pulse shape depends on the astk force-versus-de? Shock pulses having values outside the shaded area will not damage the product. Damage can render the product unacceptable because it becomes inoperable or fails to meet performance speci? Government Printing Office,pp.
A number in parentheses indicates the year of last reapproval. None will be more severe than those produced by the trapezoidal shock pulse. Safety equipment may be required, and its use must be understood before starting the test.
This is sufficient to characterize and indicate the signi? The repeatability standard deviations were 6.
For specific precautionary statements, see Section 6. Originally published as D — As you learned earlier, the determination of fragility is ast, first step in cushion design; without this information, you can’t adtm the cushion thickness that will adequately protect your product.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. For a product of this type, it is important to determine the probable number of shocks that it will be subjected to in shipment.
ASTM D Foam Test Methods
This amplitude is used to evaluate the basic recorded pulse features with respect to the speci? If it passes, the specimen is tested at a shock level that is incrementally higher. ASTM D outlines three test methods F3332 for determining the fragility of products to be packaged for shipment in the distribution environment. If the component natural satm is higher, the pulse duration must be shorter. This is required to avoid the rounded intersection of the critical velocity change and critical acceleration lines.
Common practice is to de?
ASTM D Standard for Mechanical_百度文库
Such a factor will vary widely for different types of products. The asmt level is then de? A sample of the product was subjected to half-sine shock pulses in accordance with Test Method A.
The test data will have to be corrected if signi? Longer rise and fall times cause the critical acceleration line of the damage boundary curve to deviate from the horizontal, introducing errors into the test results.
Multidirectional tests are recommended since most products have different fragilities in different orientations.
When a second sample of such a product is subjected to a single shock pulse at the same level that caused the? Calculation that assumes the shock pulse to be a perfect s3332 Accept3 able increment size is in? Alternatively, it can be measured by photodiode-type devices that measure shock table impact and rebound velocity.