# What is Failure: Definition and 248 Discussions

Failure is the state or condition of not meeting a desirable or intended objective, and may be viewed as the opposite of success. The criteria for failure depends on context, and may be relative to a particular observer or belief system. One person might consider a failure what another person considers a success, particularly in cases of direct competition or a zero-sum game. Similarly, the degree of success or failure in a situation may be differently viewed by distinct observers or participants, such that a situation that one considers to be a failure, another might consider to be a success, a qualified success or a neutral situation.
It may also be difficult or impossible to ascertain whether a situation meets criteria for failure or success due to ambiguous or ill-defined definition of those criteria. Finding useful and effective criteria, or heuristics, to judge the success or failure of a situation may itself be a significant task.

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1. ### Minimum screw thread engagement to support weight?

Hello All, I know there are rules of thumb and thread engagement calculators online but I am trying to find mathematically what the minimum number of threads acceptable would be. I currently have an eyebolt that will be torqued to a specific value. This eyebolt setup will then need to lift a...
2. ### I Application of failure criteria to viscoelastic materials

I was wondering if someone can explain how failure criteria work when dealing with viscoelastic materials. I'm quite new to this, so I only know how they work with brittle and ductile materials. (not in too much detail either). And now that I'm at it anyway, if possible an explanation on...
3. ### The 41 second clock failure syndrome

I'm curious about this failure mode. I had a cheap (\$3.82) wall clock from 2017. On Tuesday, it stopped working, getting stuck at the 41 seconds position. The second hand twitches every 1 second, but it does not advance. Since it was so cheap, I threw it away and bought a new one (also...
4. ### Engineering Can Fatigue Failure of Material be Demonstrated at Home Using Everyday Items?

What are some creative ways to display fatigue failure of material due to axial, bending, torsional loading using common household items? This is an experiment I have to do at home, I need help with some ideas
5. ### B Vacuum Audio Failure: Solutions & Tips

Got a vacuum to create bubbles in water, they advertised it as "boiling water" but it didn't seem like boiling in my book. If there were bubbles in water I am guessing there was a vacuum of 20% (20% atmosphere.) I am just estimating the 20% number. In any case, there didn't seem to be any...
6. ### Engineering Give examples of mechanical power transmission failure and solutions for a car

just want check if i got this right. is there anything i can improve or add on this example i have? Cause and why. A cause could be bending or twisting of the prop shaft due to high torque. High torque causes high angle of twist and torsion. The high torque cause high shear stress...
7. ### Satellite Failure: Environmental Causes & Triggers

I was thinking this past morning of the challenger explosion due to the stiff and cold failed O-rings in the fuel segments. I was trying to think of satellite failures, I couldn't find too much... Do you all know of satellite (components, instruments, etc) failures that occurred while in...
8. ### Bolt Thread Pullout (failure) in alu 6063-T6

I need advice how to calculate thread pull out in aluminium 6063-T6. 12 bolts screwed into an aluminium plate (thread depth 25 mm) must withstand a load of 350 kg. Thanks in advance
9. ### Catastrophic engine failure on Flight UA328

https://www.flightglobal.com/safety/united-777-suffers-engine-failure-over-denver/142519.article https://www.flightglobal.com/safety/united-777s-failed-pw4000-appears-uncontained-forward-cowling-missing/142520.article...
10. ### What can we learn from Texas' power grid failure?

https://www.nbcnews.com/science/environment/one-texas-storm-exposed-energy-grid-unprepared-climate-change-rcna289 The link above is an opinion piece that discusses the possible lessons from the experience in Texas. FYI: This was a textbook system wide grid failure, caused by off the charts...
11. ### Relay Failure Possibilities

Trying to troubleshoot a field failure on a purely resistive load on a 30A rated relay utilizing only a 24A load (cycled off/on for 45 min, 1x/day). Our wiring/load has been verified but this failure has been occurring sporadically but impact has been large. My question is, could a tin-plated...

42. ### I Help with failure statistics

(Sorry for the terrible title. If anybody have a better idea, post and I will edit. Also I have no idea of the level so now I just put undergraduate since the problem is fairly easy to state.) Suppose I buy ## N## sensors which the manufacturer tells me will fail at some point and the failure...
43. ### Testing Struggling with Statics: Any Tips for Improvement?

Hello all, I am a 19 year old female currently in my first semester of engineering school. I have taken other classes such as Physics I and Calculus I & II and done pretty well in them. Today I got my statics exam score back and received a 60%...the average was a 72%. A 60% puts me at the very...
44. ### Can Resistive Heaters Fail in Vacuum Due to Reasons Other Than Temperature?

I am working on a project for a cube-sat to go up on a balloon to 40 km. My team has been talking to some other groups who have worked on other cube-sats who say that our resistive heaters need to be Kapton heaters rather than 1D heaters like what we have designed for. They claim that our...
45. ### Is Rust the Cause of My Ball Bearing's Failure?

I am doing surface failure analysis for a ball bearing SKF 6025, , as an exercise, It has been used in the washing machine tub, after some time a noise has been reported and it is no longer rotating. When i got it I opened the seal and captured the attached photo. I had a feeling that it suffers...
46. ### Programs How to continue after a major academic failure

[Big forewarning that this is a bit of a rant written by a sleep-deprived person at the edge of their wits, but I am genuinely asking for advice as well, if a bit desperately.] [tl;dr: I flunked out of one of the best undergrad physics programs in the US in my junior year due to health issues...
47. ### Cross section change and failure of tube

Hey, working on something for a personal project and was wondering if you could point me in the right direction. I have a 47 inch hollow steel tube that I'm going to cut the end 6 inches into a half circle tube . I have a load of 200 lb at the top and am wondering how about I would quickly...
48. ### Calculate failure load on a locking pin

I currently need to show that the attached locking pin assembly will not shear or deform under load (total load is 53.5kn, shared over four of these pins) Could anyone advise on how to model this as a beam? Cantilever? What calculations can I use to prove the pins will not shear or deform to a...
49. ### Pivot Failure on Rotary Actuator

I have simplified the problem down to something like a physics textbook question, although this is a practical problem where the pivot on my rotary actuator has been damaged by a faulty driver which caused the armature to ram into the endstop. Obviously this needs better protection. My problem...
50. ### Linear algebra or intro to programming courses have higher failure rate?

which has higher failure rate: linear algebra or intro to programming. I understand failure rate might be skewed: math majors, who are gifted and interested in math, are required to take linear algebra but not intro to programming, while CS majors are required to take both. Which class do CS...