Testing Disciplines
Solar Radiation
This test is used to evaluating the effects of direct exposure to sunlight (solar spectrum and energy levels at sea level). It is used to:
 Determine the heating
effects of direct sunshine on products. |
|
| Identify the
photodegradation (actinic) effects of sunlight. |
|
| Heating Effects | |
| Solar radiation generates directional heating and thermal gradients. The amount of heat absorbed or reflected depends primarily on the roughness and color of the surface on which the light is incident. Changes in the intensity may cause components to expand or contract at different rates which can lead to severe stresses and loss of structural integrity. Typical results of these stresses are: | |
| Jamming or loosening
of moving parts. |
|
| Weakening of solder
joints and glued parts. |
|
| Changes in strength
and elasticity. |
|
| Loss of calibration or
malfunction of linkage devices. |
|
| Loss of seal
integrity. |
|
| Changes in electrical
or electronic components. |
|
| Premature actuation
of electrical contacts. |
|
| Changes in
characteristics of elastomers and polymers. |
|
| Blistering, peeling,
and delamination of paints, composites, and surface
laminates applied with adhesives. |
|
| Softening of potting
compounds. |
|
| Pressure variations. |
|
| Sweating of composite
materials and explosives. |
|
| Difficulty in
handling. |
|
| Photodegradation Effects | |
| Fading of fabric and
plastic color. |
|
| Checking, chalking,
and fading of paints. |
|
| Deterioration of
natural and synthetic elastomers and polymers. |
|
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