Mechanical Fragility Factors

DESIGN INTEGRITY

USEFUL DESIGN DATA

Convection Cooled ATR Spec

Conduction Cooled ATR Spec

Standard ATR Dimensions

Typical ATR Weights

Mechanical Fragility Factors

Pressure/Temp Variations

Thermal Management

PROBLEM SOLVING INNOVATIONS

Many of Elma-Mektron’s system enclosures are destined for operation in a wide variety of hostile and onerous environments.

Listed below as a rough guide are some typical examples of the mechanical fragility factors for some key COTS hardware components.

MECHANICAL FRAGILITY FACTORS

Component	Vibrating Operating	Vibrating Non-Operating	Shock Operating	Shock Non-Operating
VME Backplane	5 g – 20 g rms 10 Hz – 2000 Hz	5 g – 20 g rms 10 Hz – 2000 Hz	100 g 6 ms	100 g 6 ms
Convection Cooled VME Daughter Boards	2 g Sinusoidal 5 Hz – 500 Hz 0.002 g² / Hz (Random) 10 Hz – 2000 Hz	2 g Sinusoidal 5 Hz – 500 Hz 0.002 g² / Hz (Random) 10 Hz – 2000 Hz	12 g – 20 g Peak Sawtooth, 11 ms	12 g – 20 g Peak Sawtooth, 11 ms
Conduction Cooled VME Daughter Boards – Military Grade	0.1 g² / Hz 5 Hz – 2000 Hz	0.1 g² / Hz 5 Hz – 2000 Hz	40 g Sawtooth, 11 ms	40 g Sawtooth, 11 ms
Hard Disk Drive	0.1 g, 5 Hz – 32 Hz 0.5 g, 32 Hz – 400 Hz	0.1 g, 5 Hz – 28 Hz 4 g, 28 Hz – 400 Hz	5 g	75 g
Floppy Disk Drive	0.5 g, 5 Hz – 55 Hz	5 g, 5 Hz – 55 Hz	0.5 g	40 g
CD ROM	0.3 g, 5 Hz – 300 Hz	2 g, 7 Hz – 300 Hz	10 g	50 g
Open Frame Power Supply	0.15 mm Peak 10 Hz – 55 Hz 2 g, 55 Hz – 500 Hz	0.15mm Peak 10 Hz – 55 Hz 2 g, 55 Hz – 500 Hz	> 10 g 10 ms	> 10 g 10 ms

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