Heat shock:


Target
Temperature shock test to determine whether the material can withstand sudden changes in ambient temperature without physical damage or attenuation
Resist function, use. For the purposes of this document, sudden changes such as changes in air temperature over 01 degrees
Celsius is defined within one minute.
Application
This method is used when industrial materials are likely to be located where sudden temperature changes may occur.
Experience the air. This method is used to evaluate the effects of sudden temperature changes on the outer surfaces of materials, items mounted on surfaces
External or internal items located near external surfaces are considered.
Uses are as follows:
 Material transfer between environmental controlled areas and severe external environmental conditions or vice versa, e.g.
Between an air conditioning chamber and high desert temperatures, or from a warm chamber in cold areas to cold temperatures
مواد Climbing material from a high temperature ground to a high altitude through a vehicle (only from hot to cold).
Delivery of materials in conditions of high altitude and low temperature from the aircraft compartment
Limitations
This method does not specifically address the following, but may include some in some cases:
Materials that experience extreme temperature changes in internal components due to mass, configuration, packaging, installation location, etc.
They will not.
 Substances that are at high temperatures for a long time.
Temperature shock by material transferred between air and liquid or two liquids, thermal shock caused by rapid transient heating by
Engine compressor discharge air or aerodynamic loading.
When there is no significant thermal shock to the material
. Materials that have been exposed to the heat of the fire and subsequently cooled with water.
 Thermal shock testing, which may be considered to assess the safety of military equipment or ammunition hazards, should be considered
Comply with 2105C-STD-MIL.
Operational methods
First procedure: One-way shocks due to constant constant temperature.
0. While the test item in the chamber is in its proper logistic configuration, keep the chamber air temperature at a high temperature or
Is marked below. Then in the test design (T1) at a speed not exceeding 3 ° C per minute (5 °),
Adjust it. The temperature should stabilize for a while.
The temperature should stabilize for a while.
, Transfer and stabilize the temperature for a specified period of time.
, Transfer and stabilize the temperature for a specified period of time.
4. If other unilateral shocks are required, repeat steps 0-3. Otherwise, test the item with
Return to standard ambient conditions at a speed not exceeding 3 ° C (5 ° F).
5. Check the test case and, if necessary, perform an operational test. Results to compare with previous data
Record the test.
Second procedure: Shock or capture from a controlled ambient temperature.
Step 0. Using the test case in the appropriate logistics configuration, stabilize the test case under controlled environmental conditions.
do.
Step 2. Transfer the test item to an atmosphere with temperature T1 or T2 for a maximum of one minute with a specified heat shock.
Create in the test plan and stabilize the temperature for a while.
Step 3. Transfer the test item to a controlled environment for a maximum of one minute and stabilize the temperature for a period of time.
Step 4. If necessary in the test design, evaluate the effects of heat shock on the test object to a practical extent.
Step 5. Either adjust the extra shocks by repeating steps 0-4, or go to step 6.
Step 6. After completing all the required shocks, check the test case and, if necessary, perform an operational check.
Give

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