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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D Terminology of Packaging and Distribution Environments.

ASTM D3332 Foam Test Methods

The pulse shape depends on the dynamic force-versus-de? A 2 ms duration pulse can be used on a component with a natural frequency up to 83 Hz.

When possible, analyze the data for normality reasonable conformance with Gaussian probability distribution. In this way, the rounded region of the damage aztm is avoided. Government Printing Office,pp. A factor of 2 or more is normally used for an added safety margin. 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.

Most products are not affected by this multiplicity of tests. Several specimens are tested sequentially, with the test specimen being discarded or repaired after each individual shock test.

The peak acceleration of this shock pulse will often exceed Ac. It may also be used to improve product ruggedness. Multiple samples of such a product are usually tested. For this reason, shocks transmitted by some cushion materials will be less severe than those produced by the trapezoidal-shock pulse test. As more d33322 samples become available, the test results should be re?


ASTM D3332

If it fails at that shock level, the next specimen is tested at a level that is a? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

To avoid inconclusive test results, the critical acceleration test is conducted at velocity changes at d332 two times the critical velocity change of the product. This point is shown as Test No.

Method B is used when drop heights are known with great certainty. Shock Response Spectrum SRS analysis can provide a tool ast safely reducing the amount of conservatism.

When a second sample of such a product is subjected to a single shock pulse at the same level that caused the? NOTE 4—See shock machine manufacturer recommendations for setting acceleration levels because this procedure is speci?

Multidirectional tests are recommended since most products have different fragilities in different orientations.

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.


In addition, Test Methods D and E also describe this procedure.

ASTM D | Rycobel

wstm Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Method C is used for relatively rugged low fragility products that may not need cushioning. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

This procedure is repeated for each orientation and each part of the damaged boundary V c and Ac that is of interest. The shock input for each test is thus determined by the previous test result.

Each trapezoidal shock pulse had a velocity change of more than two times the critical velocity change Vc determined previously. Such a factor will vary widely for different types of products. Shock pulses having values outside the shaded area will not damage the product. It may also d333 used to improve product ruggedness.

After the tests of the? Operating personnel must therefore remain alert to potential hazards and take necessary safety precautions.