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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This fragility information may be used in designing shipping containers for transporting the products. Other items may have more or less variability. A sample of the product was subjected to half-sine shock pulses in accordance with Test Method A. Multidirectional tests are recommended v3332 most products have different fragilities in different orientations.
This may be a device that integrates the area electronically under the shock pulse waveform. For specific precautionary statements, see Section 6. If none occurs, the machine is reset for a higher maximum acceleration and the test is repeated at the same drop height.
ASTM D | Rycobel
This procedure is repeated for each orientation and each part of the damaged boundary V c and Ac that is of interest. The values given in parentheses are for information only. It may also be used to improve product ruggedness.
After the tests of the? If it fails at that shock level, the next specimen is tested at a level that is a?
The peak acceleration of this shock pulse will often exceed Ac. Shock pulse waveform is not limited since the critical velocity portion of the damage boundary is unaffected by shock pulse shape.
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. Longer rise and fall times cause the critical acceleration line of the damage boundary curve d333 deviate from the horizontal, introducing errors into the test results. Originally published as D — E3332 addition, Test Methods D and E also describe this procedure.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? When possible, analyze the data for normality reasonable conformance with Gaussian probability distribution. 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.
Calculation that assumes the shock pulse to be a perfect geometric? Multiple samples of such a product are usually tested. Accept3 able increment size is in?
On the basis of much testing experience, it has been determined f3332 rise and fall times see Fig. In this way, the rounded region of the damage boundary is avoided. Since they are relatively easy to control, shock pulses having a half sine shock waveform are normally used.
ASTM D Standard for Mechanical_百度文库
The damage boundary of a trapezoidal-shock pulse envelops damage boundaries produced by other waveforms. This fragility information may be used in designing shipping containers for transporting the products. 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.
For example, an increment of 5 g may be appropriate for most products but unacceptable for high-value products. For most products, the damage boundary will be different for each direction in which the shock occurs. D Terminology of Packaging and Distribution Environments. When a second sample of such a product is subjected to a single shock pulse at the same level that caused the?
The accelerometer shall be attached rigidly to the base structure of the product or to the?
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
For this reason, shocks transmitted by some cushion materials will be less severe than those produced by the trapezoidal-shock pulse test. The product should be supported by a?
Safety equipment may be required, and its use must be understood before starting the test. Drop height control shall be provided astmm permit reproducibility within