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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Such a factor will vary widely for different types of products. Drop height control shall be provided to permit reproducibility within A 2 ms duration pulse can be used on a component with a natural frequency up to 83 Hz. Pulse durations as short as 0. Safety equipment may be required, and its use must be understood before starting the test. In this way, the rounded region of the qstm boundary is avoided. The product should be supported by a?
ASTM D3332 Foam Test Methods
Even though the product may be a prototype, additional sub-elements are frequently available to replace the one that was damaged. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. 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.
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 Vc. Last previous edition D — For example, an increment of 5 g may be appropriate for most products but unacceptable for high-value products.
Operating personnel must therefore remain alert to potential hazards and take necessary safety precautions. Under all three methods, the test product is fastened to the carriage of a shock test machine.
Link to Active This link will always route to the current Active version of the standard. Site design by Softnet. Only the critical velocity change test ast, suffice in this case.
The procedure of A4. This procedure is less accurate than that described in A4. The instrumentation system shall have sufficient response to permit measurements in the following ranges. A product usually has a different critical acceleration for each direction in which it is tested.
This fragility information may be used in designing shipping containers for adtm the products. NOTE 4—See shock machine manufacturer recommendations for setting acceleration levels because this procedure is speci? Failure occurred in the seventh test, establishing the vertical critical velocity change line midway between the sixth and seventh test levels see 9.
ASTM D Foam Test Methods
Unit or consumer packages, which are transported within an outer container, are considered to be the product for the purposes of these test methods. Shock pulse waveform is not limited since the critical velocity portion of the damage boundary is unaffected by shock pulse shape.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Historical Version s – view previous versions of standard.
A sample of the product was subjected to half-sine shock pulses in accordance with Test Method A. Alternatively, it can be measured by photodiode-type devices that measure shock table impact and rebound velocity. The test surface shall be guided to fall vertically without rotation or translation in other directions. The SRS of the shock pulse transmitted by the cushioning need only lie below Sc in a frequency range of approximately 1?
A number in parentheses indicates the year of last reapproval.
Instead of designing the cushioning to transmit no more than the critical acceleration Ac, design the cushioning such that it transmits a shock pulse with an SRS of less than Sc lies below Sc at every frequency on the SRS plot.
Each trapezoidal shock pulse had a velocity change of more than two times the critical velocity change Vc determined previously.
Each trapezoidal shock pulse had a faired acceleration level incrementally higher than the previous shock pulse. As more product samples become available, the test results c3332 be re?
Depending on the purpose of the ast, use of the last successful test point before failure may be considered as a more conservative estimate of Ac. 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.
It is important to keep damping values the same throughout all portions of the procedures described below. 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.
ASTM D | Rycobel
When a second sample of such a product is subjected to a single shock pulse at the same level that caused the? The pulse shape depends on the dynamic force-versus-de?
This is because of the differences in pulse shape and characteristics between the fragility test and actual package cushion performance. Shock Response Spectrum SRS analysis can provide a tool for safely reducing the amount of conservatism. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. A research report5 describes an interlaboratory test program of three types of items in packages for a critical velocity change shock test.
The repeatability standard deviations were 6.