The Language of Packaging
What is Electrolysis and galvanic corrosion?
Galvanic Corrosion is the corrosion that occurs when two dissimilar metals are used together in a structure and exposed to an electrolyte (salt water, chemical, petrol) and the less noble of the 2 metals will corrode. For example; aluminum sheet with steel fasteners on a boat. Some pairings of metals are more at risk of galvanic corrosion. Check a galvanic series or chart.
Electrolysis is the acceleration of the galvanic corrosion when electricity is introduced to the metals in question. Connected by an external electrical source, the less noble metal experiences accelerated galvanic corrosion.
while both processes involve metals and electrolytes, their dependence on an external voltage source distinguishes them.
Acceleration/Deceleration (m/s²)
A vector quantity describing the time rate of change of velocity of a body in relation to a fixed reference point.
Isolator
Relatively stiff materials used in packaging to immobilize part of an article.
Load (N)
The force applied to a body.
Recovery Ability (%)
The ability of a cushioning material to regain its original dimensions following removal of a load-causing deformation.
Compression Set
The loss of thickness of a cushioning specimen after a specified time interval following removal of a compression load.
Resilience (%)
A material characteristic indicating the ability to withstand temporary deformation without permanent deformation or rupture.
Creep
The strain-time response of a material to a constant stress.
Cushioning Material
A material used as a shock and vibration isolator.
Displacement (m)
A vector quantity describing the change of position of a body, point, or surface relative to a fixed reference point.
Shock
A sudden, severe non-periodic excitation of an object or system.
Drop Height
The height from which an article is most likely to be dropped during shipment and handling.
Effective Bearing Area (m²)
The projected area of the item in the direction of impact.
Shock Pulse
A substantial disturbance characterized by a rise and decay of acceleration from a constant value in a short period of time.
Strain (%)
Deformation per unit length.
Elasticity (N/m²)
The force-displacement characteristic of a material.
Stress (N/m²)
Force per unit area.
Stress Static (N/m²)
Stress sustained by a cushion under dynamic conditions.
Encapsulation
A cushioning method involving application of material continuously around the entire exterior surface of an item.
Energy (Nm)
The capacity of a body or system for doing work.
Fragility Rating (G-factor, G-value)
The ratio of the maximum acceleration that an object can safely withstand to the acceleration of gravity.
Frequency (Hz or s⁻¹)
The reciprocal of the period of periodic oscillation.
Frequency, Discrete (Hz)
A single, distinct frequency of sinusoidal oscillation.
Frequency, Forcing (Hz)
A frequency of excitation.
Frequency, Natural (Hz)
The frequency of free oscillation.
Frequency, Resonant (Hz)
A frequency at which resonance exists.
g (m/s²)
Acceleration due to the earth's gravitational pull (approx. 9.8 m/s²).
Vibration
The oscillation of an element or a mechanical system about a suitable reference point.
Vibration, Periodic
A vibration consisting of a waveform that is repeated at equal time intervals.
Vibration, Quasi-Periodic
A vibration that deviates slightly from periodic vibration.
Vibration, Random
An oscillation having an instantaneous amplitude that can be specified only on a probability basis.
Vibration, Steady-State
A periodic vibration.
Transmissibility
The non-dimensional ratio of the response amplitude of a system in steady forced vibration to the excitation amplitude. The ratio may represent accelerations, forces, displacements, or velocities.
