Tensile strength explanation

[Maka]

I need to know if someone could tell me a bit about tensile strengths. How do I intreperate this tensile strength?

41 Kgf/sq.mm

Thanks,
Maka

 

[Bill_in_MI]

That would be 41 kilograms (force) per square millimeter. This converts to 58,325 (approx) lbs per square inch. I am presuming you are looking at this in the context of strength of materials. This tensile strength is usually stated in terms of some level of yield, deformation (strain) or fracture. But basically a one inch square of the material in question would support a load approaching 58,000 pounds....if I did my math correctly in the conversions.

 

[rdln]

multiply the smallest sectional area of your part in square millimeters and multiply by 41 to see the strength during load in tension. Tension is opposite of shear. For example fishing line is rated in tension strength. This measurement is when material starts to deform or start its "plastic" state, total failure is not too far away.

 

[BB_TX]

My calculation came out the same as Bill's. It falls in the range of a <font color="blue"> grade 2 </font> bolt.

 

[turbo36]

Tensile strength is usually referred as "Ultimate Tensile Strength" this is the point that you have a complete failure or separation under load. Do not confuse this with "yield strength" this is the point were you experience permanent deformation but not a separation failure.
Typically you design around the yield strength and not the tensile strength.

 

[rockyridgefarm]

There are many forces which act on a item.

The material's capacities are measured using differant criteria.

Tensile strength refers to elongation (the force required to break fishing line is a good example)

Other factors are shear strength (shear as in a cutting or twisting action)

Compressive strength (like the resistance to a load by a foundation)


I often see someone describing an item using the wrong property, like this concrete has high tensile strength, so it can handle a heavy load...

 

[RonR]

My favorite quote from a sailing site: "Anything that is worth engineering is worth over-engineering."

Go to the next size bigger and be done with it. Too hard to calculate.

I have been blessed (so far) to be able to look at a design I'm planning and GENERALLY see the weak spots...........

Have fun.
ron

 

[slaveToHorses]

a couple of semantic corrections:

tensile strength does not indicate how much of a load can be supported, but how much of a load can be suspended.

tensile strength is not opposite shear, it is orthogonal to shear and opposite compression.
Not to be confused with the load on a beam, in tension...

 

[BlueRidge]

Orthogonal? Don't hear that term much. /forums/images/graemlins/grin.gif

I suspect you are going to have to explain that to a few people, but thanks for posting the correct information.

 

[BB_TX]

I knew you were an engineer before I looked at your profile. /forums/images/graemlins/grin.gif I had wanted to make the same correction but had managed to control myself.