Why does increased loading rates increase the strength of the materials?

Answer 1

Perhaps you are thinking of pre-stressed configurations. The idea there is that you stress something in one direction and then apply the load in the opposite direction.

A simple example would be to take a wooden ruler and hold it horizontally, pressing in on the ends so that it bends upwards a little. Then put some weight on the top. You can put quite a bit of weight on the top of the ruler before it gets to the completely flat state. Just before that point you will see that a far greater weight can be supported than if you just held the ruler flat in the first place.

Is that what you were thinking of?

Answer 2

The opposite is true. When the loading rate is increased the material fails at a lower stress. This is because there is insuffient time for molecules to realign themselves. Often sudden loads lead to fracture. Even a non-brittle material may fracture if the loading rate is immense

Answer 3

Well basically its damn simple .... you c in a glass tumbler you can very easily pour water , say ..... ounces . Nw if you poured castor oil of the same qty into it wat wud happen ??? Furthermore dump in a few ounces of liquid tar ..... It goes so on and on...

Greater the density of the stress Lesser its loading index . In other words increase your loadin rate and the subject xperiences more mech stress. Tats y principally objects or materials are constructed to hold TEN times the actual load they are supposed to handle ...

So the next time you load UP YOUR BICYCLE remember if you are one person or EQUAL TO FIVE OTHERS !!!!!!!!!