The test is divided into many kinds, we are involved in all aspects of life, all have to go through a variety of tests, to achieve a variety of standards. Before a product is put into use, it is necessary to test whether it is safe, reliable and stable, so as to verify the real operation condition in the future use environment. In particular, in some important fields, a slight error will cause heavy losses and threaten the safety of people's lives and property, such as smart power grid, urban underground comprehensive pipe corridor, military industry and other industrial fields.
The effect of low temperature on products
1, rubber and other flexible materials reduce the elasticity, and produce rupture.
2, metal and plastic brittleness increases, resulting in rupture or crack.
3, due to the different shrinkage coefficient of the material, when the temperature variation is larger, it will cause the moving parts to be stuck or not rotating smoothly.
4, lubricant viscosity increases or solidification, friction between moving parts increases, causing slow action, or even stop working.
5. The electrical parameters of components change, affecting the electrical properties of products.
6, icing or frost caused product structure damage or damp, etc.
Low temperature environmental effect
1, make the material hardening and embrittlement.
2. Different shrinkage characteristics of different materials make parts stuck.
3, due to the increase of lubricant viscosity and loss of lubrication.
4, electrical changes (such as resistance, capacitance, etc.).
5. Function changes of transformers and electromechanical components.
6. Impact base becomes hard.
7, explosive rupture, such as ammonium nitrate.
8, make the specimen crack, embrittlement and change the impact strength and reduce the strength.
9. Glass produces static fatigue.
10. Condense and freeze water.
11, reduce human dexterity and make hearing and vision degradation.
12. Change the combustion rate.
Influence of high temperature on products
1, due to the different expansion coefficient of various materials, resulting in the bonding and migration between materials.
2, lubricant loss or lubrication performance is reduced, increasing wear between moving parts.
3, sealing packing, gasket, sealing, bearing and rotating shaft deformation.
4. Mechanical failure or complete failure caused by bonding.
5. The electrical parameters of components change, affecting the electrical properties of products.
6, transformer, mechanical and electrical components overheating.
7, flammable or explosive materials cause combustion or explosion.
8. Increased pressure inside the seal causes rupture.
9, organic materials aging, discoloration, bubbling, cracking or cracking.
10. The insulation performance of insulating materials is reduced.
High temperature environmental effect
1. The different expansion characteristics of different materials make the parts stuck.
2, lubricant loss of viscosity, so that the loss of lubricant leads to the loss of lubrication of the contact.
3. Change the size of all or part of the specimen.
4, as a result of packaging, gaskets, seals, bearings and spindle become skewed, stuck and failure caused by mechanical or total failure.
5, gasket permanent deformation (glue).
6, air tightness function degradation.
7, resistance value change.
8. The stability of the circuit varies with the temperature gradient and the different expansion characteristics of the material.
9. Overheating of transformers and electromechanical components.
10. Change the action/non-action margin of relay and magnetic and thermal starting components.
11, shorten the operation life time.
12, solid material internal crystal structure produces separation.
13. High pressure is generated inside the closed specimen.
14. Accelerate explosives and thruster combustion.
15. The explosive casting shell expands.
16. Dissolution and exudation of explosives.
Deterioration and rupture of organic materials.
The effect of temperature change on the product
1. The coating layer of the components falls off, the sealing material and sealing compound crack or even break the sealing shell, and the filling material leaks, which reduces the electrical performance of the components.
2, made up of different materials of products, temperature changes when the product is not uniform heating, resulting in product deformation, sealing products cracking, glass or glassware and optical devices and other broken.
3. The larger temperature difference makes the surface of the product produce condensation or frost at low temperature, and evaporate or melt at high temperature. The result of such repeated action leads to and accelerates the corrosion of the product.
Environmental effects of temperature change
1, glass products and optical equipment rupture.
2. Movable parts are stuck or loose.
3. Structure produces separation.
4. Electrical changes.
5. Electronic or mechanical failure due to rapid condensation or freezing.
6, with granular or striate rupture.
7. Different shrinkage or expansion properties of different materials.
8. Component deformation or rupture.
9, surface coating cracking.
10. Leakage of airtight cabin.
