The purpose of mechanical impact is to verify the structural strength of the product when the product is not packaged with cushioning materials, and it can also be used as one of the tools for exploring the best packaging method when the product is packaged.

In general, the shock test can be divided into the following three types of waveforms according to different requirements and usage environments:
 
  • Half-Sine Wave: It is widely used to look for the material limit of the product's mechanism. In addition to verifying the strength of the product itself, it can also verify whether the interconnected strength both composite material and assembly process (such as solder joint) can meet the requirements of quality.

 
 
  • Trapezoidal Wave (Square Wave ): It is often used to look for the optimized package design of product protection, and simulate the impact strength of the product under the protection of packaging materials.


 
  • Saw-tooth Wave: There are two kinds of saw-tooth wave, Saw-tooth leading edge and Saw-tooth trailing edge, and both are generally used for product validation in military, aeronautical applications or other special environments.

The International Electrotechnical Commission (IEC) provides basic shock test reference conditions as shown in Table 1 for system/module products that have a low probability of being subjected to impact stress during the product life cycle. When it is recommended to perform an shock test, the main verification specification is to perform three impacts in each directions (total of six directions) for the unpackaged product. For the number of test samples, it is recommended that at least three DUTs pass the specified shock conditions.
<Table1 General Shock Conditions>

 

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