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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Under all three methods, the test product is fastened to the carriage of a shock test machine. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The shock input for each test is thus determined d333 the previous test result. Government Printing Office,pp. D Terminology of Packaging and Distribution Environments.
The instrumentation system shall have sufficient response d332 permit measurements in the following ranges. If it fails at that shock level, the next specimen is tested at a level that is a? Then, when the carriage is dropped, the product is examined for product damage. The pulse shape depends on the dynamic force-versus-de? Current edition approved April 10, The accelerometer shall be attached rigidly to the base structure of the product or to the?
Be certain that the velocity change of subsequent shock pulses is maintained at or above the level determined in 9. Each trapezoidal shock pulse had a faired acceleration level incrementally higher than the previous shock pulse.
For a product of c3332 type, it is important to determine the probable number of shocks that it will be subjected to in shipment. This fragility information may asm used in designing shipping containers for transporting the products.
ASTM D Foam Test Methods
Depending on the purpose of the test, use of the last successful test point before failure may atsm considered as a more conservative estimate of Vc. 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. Several specimens are tested sequentially, with the test specimen being discarded or repaired after each individual shock test.
Historical Version s – view previous versions of standard. In other frequency regions the cushion SRS may exceed Sc.
Two test methods are outlined, as follows:. 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.
A research report5 describes an interlaboratory test program of three types of items in packages for a critical velocity change shock test. Drop height control shall be provided to permit reproducibility within After the tests of the? A product usually has a different critical velocity change for each direction in which it is tested.
It may also be used to improve product ruggedness. 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.
Last previous edition D — This is because of the differences in pulse shape and characteristics between the fragility test and actual package cushion performance.
Site design by Softnet. As more product samples become available, the test results should be re? It will fail only when it is subjected to even higher level shocks. That is, it may be possible to design the cushion d3332 transmit a somewhat higher acceleration yet still not cause damage sstm the product. The procedure of A4. Precision and Bias Accept3 able increment size is in?
ASTM D3332 Foam Test Methods
If none occurs, the machine is reset for a higher maximum 3d332 and the test is repeated at the same drop height. The maximum acceleration at which product damage first occurs is the fragility of the product in the direction tested. The damage boundary of a trapezoidal-shock pulse envelops damage boundaries produced by other waveforms.