A box can be used for this event instead of a chair. If a chair is used, it is well to have a very sturdy one. This race starts with the players in the same position as in the preceding race, the player on the right hand end of the line sitting... Read more of Chair Sitting Race at Games Kids Play.caInformational Site Network Informational
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Steel Making

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Annealing
There is no mystery or secret about the proper annealing of d...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...



Fatigue Tests






Category: COMPOSITION AND PROPERTIES OF STEEL

It has been known for fifty years that a beam or rod would fail
at a relatively low stress if only repeated often enough. It has
been found, however, that each material possesses a limiting stress,
or endurance limit, within which it is safe, no matter how often
the loading occurs. That limiting stress for all steels so far
investigated causes fracture below 10 million reversals. In other
words, a steel which will not break before 10,000,000 reversals
can confidently be expected to endure 100,000,000, and doubtless
into the billions.

About the only way to test one piece such a large number of times
is to fashion it into a beam, load it, and then turn the beam in
its supports. Thus the stress in the outer fibers of the bar varies
from a maximum stretch through zero to a maximum compression, and
back again. A simple machine of this sort is shown in Fig. 10,
where B and E are bearings, A the test piece, turned slightly
down in the center, C and D ball bearings supporting a load
W. K is a pulley for driving the machine and N is a counter.





Next: Hardness Testing

Previous: Impact Tests



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