Be with us all going at one time or another: We have been a victim of failure stress. I also have a permanent loss of this kind, broke my shin, and broke a very important crossroads that require surgery ... But the most careful of us have a less painful failures:
Error
- A break rake in our hands
- Or take a board under our feet
- Or even a crack in our go-kart chassis.
The error can be traced back to an eventhigh stress or obvious miss-application of design intent:
For example:
- Jumping Go-Kart
- Or try to move the rocks with the rake
- Or jumping on a board that was too thin
Each of these instances are descriptions of the failure. The funny thing is that we are able to predict the failure of assimilation correct information (which are always available) and with the help of mathematical relationships.
Sounds fancy and complicated, but it really means:
Things have theirBreaking point, we can predict this breaking point with relative ease.
So, for them ...
First, a basic understanding of how to evaluate the failure is required.
The science of non-
Science is a system of thinking based on cause and effect.
Translation: A Cause (a Go-Kart flight obscene speeds) flies over a jump and lands on all wheels, but suddenly falls to the ground making ugly scraping sounds (the effect).
What otherVariables exist for this problem? Well, what exactly is the problem? A Broken Frame!
To the untrained eye, the failure would be perceived as the go-kart went over the jump, when in reality it is a failure, because the frame is not able to handle the jump to load.
What went wrong?
So, what is it that caused the frame?
This raises the question of what exactly was the failure?
The frame cracked pipes under the seat and basically ripped the tubesHalf and the Go-Kart bent down and scraped on the floor.
Thus, the pipes, cracked, and ripped and bent.
To further evaluate the problem, we see that the tube (single) or section has a thickness of material. This section of the material torn or ripped.
Key To Failure
The tearing of the material is the key to understanding the basis for the so-called stress. In fact, most of the materials have the possibility to extend, or be upset. Stress is evaluated as theAmount of force for the area that the force can act on the material divided.
Stress = Force / Area
So, for example, cable is a solid (0.0625 inch wire diameter) hang from the ceiling. I have a load on the cable 100 pounds. The tension in the cable is 100 pounds for the cross section of the cable, or 100 pounds / 100 pounds, or RIP 2 ^ / ^ 2 = 0003 to 32,594 psi divided
To predict whether the cable would snap or not, the stress would be approximately 36000 psi WellAs you can see, we're really up to 36000 psi and not hit the light near the weight would lead to SNAP!
What we did was just a prediction. 0.0625 A cable can only load so much, and that is 100 pounds!
Ok, what do I know? Because scientists have observed that steel (steel that is) breaks consistently at around 36,000 psi stress. In fact, special equipment has been designed to fail just because of material samples, day after day. What they do isValidation samples of the materials for foundries and steel mills made sure that people like you and I can predict with relative certainty, and the things that we do not pause in mid-kart.
To recap is so stress as force per unit area or defined
Stress = Force / Area
It 'important to understand that the area covers part of the overall strength of the part, because the forces pass through this area.
We understand this very well when you get a large rubber bandand compares with a small elastic. The main difference between the two is the cross section of the rubber band. The largest rubber band has more room to work with, and therefore exerts more force when stretched.
3 rubber bands when we were together equal the same power as the elastic large, that due to the larger rubber band has three times as much area as the tire is smaller.
So stress is the force that can take a part of the area. Once the powerexceeds the load capacity in areas of the company, it snaps, breaks, or stretches then snaps!
Next time ... Cross section and the relationship to fail
