It happened to all of us at one time or another: we became a victim of stress. I myself, for example, survived the failure, my legs broke and broke at a very important intersection, which required surgical intervention ... But most of us observed less painful failures:
Failures such as
- Greyk breaks in our hands.
- Or board, bouncing under your feet
- Or even a crack in our picture frame.
Failure can be traced to any event with a high load or, obviously, with a slip of the application of the design:
For example:
- Jumping from the screen
- Or try to move the stones with a rake
- Or jump on a board that was too thin
Each of these examples are descriptions of failure. The funny thing is that we can predict failure by assimilating the right information (which is easily accessible) and using mathematical relationships.
It sounds unusual and difficult, but in fact it means:
Things have their own break point, we can reliably predict this break point.
So let's get to it ...
First of all, you need a basic understanding of how to evaluate failure.
Science of failure
Science is a system of thinking that deals with cause-and-effect relationships.
Transfer : The reason (the kart trip with indecent speeds) flies over the jump and lands on all wheels, but suddenly falls to the ground, making ugly scraping sounds (effect).
What other variables exist for this problem? Well, what's the problem? Broken frame!
For an unprepared eye, the refusal would be perceived as because the go-kart went on the jump, when in reality the failure was that the frame could not cope with the load on the jump.
What happened?
So what is the frame that caused it?
It asks the question what was the failure?
Rama cracked the tubes under the seat and basically broke the tubes in half, and the picture was bent and scraped off the ground.
Thus, the pipes are cracked, torn and curved.
To further evaluate the problem, we see that the pipe (individually) has a wall thickness or section of material. This section of the material is broken or torn.
Key to failure
The breaking capacity of a material is the key to understanding the basis of what is called stress. In fact, most materials have the ability to stretch or shrink. Stress is estimated as the magnitude of the force divided by the area that acts on what the material can accept.
Stress = Strength / Area
For example, a solid cable (0.0625 inches in diameter) hangs from the ceiling. I put a 100 kilogram load on the cable. The voltage in this cable is 100 pounds divided by the cross-sectional area of the cable, or 100 pounds / PiR ^ 2 or 100 pounds / .003 to ^ 2 = 32594 pounds per square inch
To predict whether the cable will loop or not, the voltage should be around 36,000 pounds per square inch. Well, as you can see, we are really close to 36,000 pounds per square inch, and any light weight strike will lead to a SNAP!
What we did was a little prediction. A .0625 cable can handle so much stress, and 100 pounds is that!
Okay, how did I know that? Because scientists have noticed that steel (mild steel) collapses consistently at a voltage of about 36,000 pounds per square inch. In fact, special parts of the equipment are intended to simply pass from day to day because of problems with materials. What they are doing is checking samples of materials from foundries and steel mills so that guys like you and me can predict and do things with relative certainty that the gokra we produce will not break in half.
So to stress stress is defined as Strength per unit area or
Stress = Strength / Area
It is extremely important to understand that the area of the part is related to the overall strength of the part, because the forces pass through this area.
We understand this very well when we select a large rubber band and compare it with a small rubber band. The main difference between them is the cross-sectional area of the rubber tape. The larger rubber band has more area to work with and, therefore, it applies more force in tension.
If we had assembled three small rubber bands, we could be equal to the same strength as a large rubber band, because a large rubber band has 3 times more area than small rubber bands.
Thus, stress is the power that a part of a region can accept. After the force reiterates that it has the capacity to hold the load, it snaps into place, breaks or stretches, and then clicks!
Next time ... Sectional area and connection with failure
