AIRCRAFT STRUCTURE I M3 Flashcards
The _________ or ___________ is the maximum stress (tensile, compressive or bending) that is allowed to be applied on a structural material.
allowable stress or allowable strength
The _______________ are generally defined by building codes, and for steel, and
aluminum is a fraction of their yield stress (strength)
allowable stresses
___________ is the maximum stress that can be applied before it begins to change shape permanently.
Yield stress (strength)
This is an approximation of the elastic limit of the steel.
Yield stress (strength)
If _______ is added to the metal but does not reach the yield point, it will return to
its original shape after the stress is removed
stress
_______________ are structures that can be analyzed using statics equations only, (i.e., equilibrium in all directions).
Statically determinate structures
______________ can’t be analyzed using statics equations only
statically indeterminate structures
they require other material properties, such as deformations, in order to analyze them.
statically indeterminate structures
When all forces in a structure is determined from equilibrium equations, the structure is known as statically determined.
Determinate structure
Support will not develop moment and horizontal force to prevent collapse.
Determinate structure
No load redistribution.
Determinate structure
Bending moment and shear force at any section of beam is independent of material
property and cross section of the structure.
Determinate structure
No stresses due to lack of fit and temperature variations.
Determinate structure
When unknown forces in a structure are more than available equilibrium equations,
that structure is known as statically indeterminate structure.
Indeterminate structure
Support will develop moment and horizontal force to prevent collapse.
Indeterminate structure
Tendency to redistribute load.
Indeterminate structure
Bending moment and shear force at any section of beam is depends on material
property and cross section of the structure.
Indeterminate structure
Stresses caused due to lack of fit and temperature variations.
Three laws of mechanics describing the _____ of a body.
motion
The ____ law states that a body remains at rest or in uniform motion in a straight line unless acted upon by a force.
first
The ____ law states that a body’s rate of change of momentum is proportional to the force causing it.
second
The _____ law states that when a force acts on a body due to another body, then an equal and opposite force acts simultaneously on that body.
third
