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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A superscript epsilon e indicates an editorial change since the last revision or reapproval. In this way, the rounded region of the damage boundary is avoided. For specific precautionary statements, see Section 6. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
When possible, analyze the data for normality reasonable conformance with Gaussian probability distribution. Accept3 able increment size is in? In other frequency regions the cushion SRS may exceed Sc. Multiple samples of such a product are usually tested. The accelerometer shall be attached rigidly to the base structure of the product or to the?
Damage can render the product unacceptable because it becomes inoperable or fails to meet performance speci? Several specimens are tested sequentially, with the test specimen being discarded or repaired after each individual shock test.
The betweenlaboratory or reproducibility standard deviation was 5. 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. This standard awtm subject to revision at any time by the responsible technical committee and must be reviewed every? NOTE 1—The points at which the? On the basis of much testing experience, it has been determined that rise and fall times see Fig.
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. Operating personnel must therefore remain alert to potential hazards and take necessary safety precautions. It satm fail only when it is subjected to even higher level shocks. The testing of hazardous material or products may require special precautions that must be observed.
Originally published as D — Users of this standard are expressly advised that r3332 of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
A 2 ms duration pulse can be used on a component with a natural frequency up to 83 Hz. If the product is complex, usually some sub-element of the product will fail?
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.
ASTM D | Rycobel
Individual reprints single or multiple c3332 of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Drop height control shall be provided to permit reproducibility within It may also be used to improve product ruggedness.
This may be a device that integrates the area electronically under the shock pulse waveform.
The SRS of the shock pulse transmitted by the cushioning need only lie below Sc in a frequency d33332 of approximately 1? Failure occurred in the fourteenth test, establishing the horizontal critical acceleration line Ac midway between the thirteenth and fourteenth test levels see 9. Maximum-faired acceleration level of the?
For a given product, the interrelation of these three parameters is shown by damage boundary, as plotted in Fig. The instrumentation system shall have sufficient response to permit measurements in the following ranges.
In some cases, when a product contains heavy resiliently supported masses that will distort the shock pulses severely, it may be necessary to precalibrate the shock machine. 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.
Quality Foam can fabricate our foams to your exact specifications, whether working from our own in-house design or customer-supplied drawings. Government Printing Office,pp. Alternatively, it can be measured by photodiode-type devices that measure shock table impact and rebound velocity. A number in parentheses indicates the year of last reapproval. For most products, the damage boundary will be different for each direction in which the shock occurs.
A product usually has a different critical velocity change for each direction in which it is tested. Sample size determination based on Practice E or other established statistical procedures is recommended. The pulse shape depends on the dynamic force-versus-de?
ASTM D3332 Foam Test Methods
As you learned earlier, the determination of fragility is the d333 step in cushion design; without this information, you can’t determine the cushion thickness that will adequately protect your product.
The test area should be cleared prior to each impact. Even though the product may be a prototype, additional sub-elements are frequently available to replace the one that was damaged. Tp 5 maximum shock test machine pulse duration in ms, and f c d33332 component natural frequency in Hz. The shock input for each test is thus determined by the previous test result.