RCF HDL 30-A (13000511) 72033594 [9/32] Rcf shape designer software and safety factor

“RCF SHAPE DESIGNER” SOFTWARE AND SAFETY FACTOR

The suspension system is designed to have a proper safety factor (conﬁguration dependent). Using the “RCF Easy

Shape Designer” software it is very easy to understand safety factors and limits for each speciﬁc conﬁguration. To

better comprehend in which safety range the mechanics are working a simple introduction is needed: HDL 30-A arrays’

mechanics are built with certiﬁed UNI EN 10025 Steel. RCF prediction software calculates forces on every single

stressed part of the assembly and shows the minimum safety factor for every link. Structural steel has a stress-strain (or

equivalent Force-Deformation) curve as in the following:

The curve is characterized by two critical points: the Break Point

and the Yield Point. The tensile ultimate stress is simply the

maximum stress attained. Ultimate tensile stress is commonly

used as a criterion of the strength of the material for structural

design, but it should be recognized that other strength properties

may often be more important. One of these is certainly the Yield

Strength. Stress-strain diagram of structural steel exhibit a sharp

break at a stress below the ultimate strength. At this critical stress,

the material elongates considerably with no apparent change in

stress. The stress at which this occurs is referred to as the Yield

Point. Permanent deformation may be detrimental, and the industry

adopted 0.2% plastic strain as an arbitrary limit that is considered

acceptable by all regulatory agencies. For tension and compression,

the corresponding stress at this offset strain is deﬁned as the yield.

In our prediction software the Safety Factors are calculated considering the Maximum Stress Limit equal to the

Yield Strength, according with many international standards and rules.

The resulting Safety Factor is the minimum of all the calculated safety factors, for each link or pin.

This is where you are working with a SF=7

Depending on local safety regulations and on the situation, the

required safety factor can vary. It is responsibility of the owner or

rigger to make sure that the system is properly rigged in accordance

with Country and local laws and regulations.

The “RCF Shape Designer” software gives detailed information of

the safety factor for each speciﬁc conﬁguration.

The results are classiﬁed in four classes:

GREEN SAFETY FACTOR > 7 SUGGESTED

YELLOW 4 > SAFETY FACTOR > 7

ORANGE 1.5 > SAFETY FACTOR > 4

RED SAFETY FACTOR > 1.5 NEVER ADMITTED