ASTM D3332 PDF

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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For this reason, shocks transmitted by some cushion materials will d33332 less severe than those produced by the trapezoidal-shock pulse test. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

For example, an increment of 5 in. The test data will have to be corrected if signi? For example, a component of a product with a natural frequency below 56 Hz can be effectively zstm on a shock machine with a 3 ms duration pulse.

It may also be used to improve product ruggedness. Site design by Softnet. The procedure of A4. The values given in parentheses are for information only.

Method C is used for relatively rugged low fragility products that may not need cushioning. If none occurs, the machine is reset for a higher maximum acceleration and the test is repeated at the same drop height.

Sample size determination based on Practice E or other established statistical procedures is recommended. If the product is complex, usually some sub-element of the product will fail?

Failure occurred in the seventh test, establishing the vertical critical velocity change line midway between the sixth and seventh test levels see 9. Originally published as D — An SRS plot is a graph of the absolute r3332 of the maximum response accelerations of each spring-mass system, plotted at their various natural frequencies.

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. Shock pulses having values outside the shaded area will not damage the product. Depending on the purpose of the test, use of the last successful test point before failure may be considered ast a d33332 conservative estimate of Vc.

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ASTM D | Rycobel

ASTM D outlines three test methods A-C for determining the fragility of products to be packaged for shipment in the distribution environment. If zero damping is speci? Alternatively, it can be measured by photodiode-type devices that measure shock table impact and rebound velocity.

This procedure is repeated for each orientation and each part of the damaged boundary V c and Ac that is of interest. This may be a device that integrates the area electronically under the shock pulse waveform. It will fail only when it is subjected to even higher level shocks. astn

ASTM D Standard for Mechanical_百度文库

xstm For the same reason, waveforms having faired shapes that are not trapezoidal should not be used for this test. A product usually has a different critical velocity change for each direction in which it is tested. A product usually has a different xstm acceleration for each direction in which it is tested. This is required to avoid the rounded intersection of the critical velocity change and critical acceleration lines. Although a true square wave shock pulse is most desirable in theory, it is not possible to obtain in?

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 Sstm at every frequency on the SRS plot. 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.

Method A is used when information on drop heights is limited. 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.

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This point is shown as Test No. Only the critical velocity change test may suffice in this case. Complete details and descriptions of SRS may be found in the literature Two test methods are outlined, as follows:. This is because of the differences in pulse shape and characteristics between the fragility test and actual package cushion performance. This amplitude is used to evaluate the basic recorded pulse features with respect to the speci?

After the tests of the?

ASTM D3332

On the basis of atsm 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.

For most products, the damage boundary will be different for each direction in which the shock occurs. Government Printing Office,pp. A sample astn the product was subjected to half-sine shock pulses in accordance with Test Method A.

Most products are not affected by this multiplicity of tests. Link to Active This link will always route to satm current Active version of astmm standard. NOTE 4—See shock machine manufacturer recommendations for setting acceleration levels because this procedure is speci?

Then, when the carriage is dropped, the product is examined for product damage. Users of this standard d3332 expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Multidirectional tests are recommended since most products have different fragilities in different orientations. Shock pulse waveform is not limited since the critical velocity portion of the damage boundary is unaffected by shock pulse shape. It is important to keep damping values the same throughout all portions of the procedures described below. Acceptable increment size is in?

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