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 −
|Published (Last):||23 August 2006|
|PDF File Size:||9.47 Mb|
|ePub File Size:||8.27 Mb|
|Price:||Free* [*Free Regsitration Required]|
As you learned earlier, the determination of fragility is the first step in cushion design; without this information, you can’t determine the cushion thickness that will adequately protect your product.
Satm this way, the rounded region of the damage boundary is avoided. Method A is used when information on drop heights is limited. The accelerometer shall be attached rigidly to the base structure of the product or to the?
If zero damping is speci? For example, an increment of 5 g may be appropriate for most products but unacceptable for high-value products. As more product samples become available, the test results should be re? Drop height control shall be provided to permit reproducibility within Two test methods are outlined, as follows: If it passes, the specimen is tested at a shock level that is incrementally higher.
This procedure is repeated for each orientation and each part of the damaged boundary V c and Ac that is of interest.
In other frequency regions the cushion SRS may exceed Sc. Each trapezoidal shock pulse had a velocity change of more than two times the critical velocity change Vc determined previously. Pulse durations as short as 0. The SRS of the shock pulse transmitted by the cushioning need only lie below Sc in a frequency range of approximately 1? S3332, some products will fail prematurely due to cumulative effects.
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.
Current edition approved April r3332, This is required to avoid the rounded intersection of the critical velocity change and critical acceleration lines. 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. If the product is complex, usually some sub-element of the product will fail?
Calculation that assumes the shock pulse to be a perfect geometric? Complete details and descriptions of SRS may be found in the literature None will be more severe than those produced by the trapezoidal shock pulse. For the same reason, waveforms having faired shapes that are not trapezoidal should not be used for this test.
Depending on the purpose of the test, use of the last e3332 test point before failure may be considered as a more conservative estimate of Vc. This is sufficient to characterize and indicate the signi? This point is shown as Test No. Historical Version s – view previous versions of standard. Unit or consumer packages, which are transported within an outer container, are considered to be the product for the purposes asm these test methods.
For a given product, the interrelation of these three parameters is shown by damage boundary, as plotted in Fig.
This procedure is less accurate than that described in A4. The pulse shape depends on the dynamic force-versus-de? It is important to keep damping values the same throughout 3d332 portions of the procedures described below.
The maximum acceleration at which product damage first occurs is the fragility of the product in the direction tested.
ASTM D Foam Test Methods
Precision and Bias On the basis of much testing experience, it has been determined that rise and fall times see Fig. ASTM D outlines three test methods A-C for determining the fragility of products to be packaged for shipment in the distribution environment.
Maximum-faired acceleration level of the? The values given in parentheses are for information only. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
A 2 ms duration pulse can be used on a component with a natural frequency up to 83 Hz.
Sample size determination based on Practice E or other established statistical procedures is recommended. Site design by Softnet. Examples of unpackaged product handling are movement of the?