Relation between Youngs Modulas & Tensile strength

get thermal power enginering and get details.

Reg.

xyz

Youngs Modulus and Tensile Strength are intrinsic properties of the material from which the tube is made. Ussually, high strength materials have high youngs modulus

Broadly speaking, no. If you're referring to various grades of steel, strength changes a lot but Young's modulus is almost constant at 200 GPa. This is why, if a design is limited by deflection rather than stress, as is often the case, there is no advantage in using higher-grade steel. It may be possible to increase the strength of a metal by eg heat treatment, but Young's modulus doesn't alter.

For a lot of engineering materials, the ratio of density to Young's modulus (often the important criterion) is quite close, making selection between say steel, aluminium, GRP, timber a difficult choice.

There's a good little book on this (not a textbook, paperback size) by a late Scottish professor, but I can't remember his name or the book title. If I can find it I'll post it.

Codemaster is right, young modulus normally don't changes or change very little across the same type of material.

I'm not sure how you changes the young modulus of the tube. assume you do it by using other material, the tensile strength ofcourse will change according to the material replaced.

Following earlier posting, the book is called The New Science of Strong Materials: Or Why You Don't Fall Through the Floor (Penguin Science) (Paperback)
by J.E. Gordon

He also wrote one called Structures: Or Why Things Don't Fall Down (Penguin Science)

both are very well-written and interesting, and quite different from the usual strength of materials type books. Available from Amazon.

Thanks for the recommendation.

I concur with what others have said, in general. An exception to the rules of thumb (that modulus tends to remain constant for a material, and that modulus tends to increase as strength increases) occurs in the case of carbon fiber materials. There, you can select high modulus or low modulus materials, and generally you trade one for the other. But all of what we've said, is in the category "rules of thumb." There are many exceptions, and you really need to look at all the properties of a material before making a selection.