Design
| Enviro |
Astro | Propulsion
| Power | Thermal
| Structures | AD&C
| CDHS |
Test
Here
are some different types of stress
that affect a spacecraft structure.
Stress
Stress
(s)
is applied load (force) per unit area.
Strain
(e)
is
the change in length from an applied load.
Modulus
of Elasticity (E)
describes how much a material deforms with a given
amount of stress.
Hooke's
Law (s = Ee)
expresses a linear stress-strain relationship for
most materials.
Shear
stress results from applied transverse loads.
Thermal
stress results from heating expansion and cooling
contraction of a spacecraft structure in orbit as
it is exposed to the Sun or shade respectively.
These are called thermal cycles and may cause material
degradation or undesired vibrations.
