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ACT CH04
| Term | Definition |
|---|---|
| grains | are formed by the crystalline pattern of the metal and alloy molecules |
| elasticity | is the ability of a metal to bend without permanent deformation |
| elastic deformation | metal with ______________ will return to its original position if the force holding the metal out of position is removed |
| plasticity | is the ability of a metal to be shaped |
| plastic deformation | If the applied force moves the metal beyond its yield point |
| bend | the difference between a bend and a buckle is that a _______ is purposely put into the part when the part is manufactured |
| buckle | this is caused by impact force |
| work hardening | When a change in grain structure increases the strength of metal in the bend area |
| body line | is a styling line in a hood |
| crown | the curvature of a panel. There are four basic types |
| combination crown | means that a panel has at least two types of crown (high and low) |
| force | can be defined as any action between two objects that changes their relative condition as to motion or rest |
| yield point | the minimum amount of force required to case a permanent change in grain arrangement |
| longitudinal force | force applied from one end |
| simple rolled buckles | simple folds on sheet metal |
| collapsed-hinge buckle | distortion that takes place on the fold |
| lateral force | force applied from the side |
| arrowhead | a buckle that becomes work hardened and resistant to force |
| inertia | the tendency of an object to remain at rest or to remain in motion |
| inertia damage | an upward deflection of the rear section may cause a buckle in the roof at a pivot point |
| target | the object a vehicle collides with is called a ___________ |
| impact angle | another collision factor to be considered when an accident occurs |
| surface area of impact | another collision factor to be considered when an accident occurs |
| vehicle height | the last collision factor to be considered |
| direct damage | damage that occurs at the point of contact during a collision |
| indirect damage | occurs away from the point of impact and is a result of the direct damage |
| upset | the compression of the grains |
| bend-versus-kink rule | states that damaged high-strength steel parts can be repaired if they are bent but must be replaced if they are kinked |
| kink | has a buckle that is 90 degrees in a short area |
| kickup | when a frame moves up due to a collision |
| sag | when a frame moves down due to a collision |
| mash | the change in frame length due to a collision |
| sidesway | the lateral movement of rails |
| diamond | when the frame rails and cross members in the center section of the vehicle no longer form a rectangle |
| twist | if the frame rails under the cab are not level with each other |
| dent | a buckle forms and the surface area of the metal permanently increases |
Created by:
cvis
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