ma le rotture ???

[cassero88]

hello to all I designed a crane with telescopic arm. Now the crane is designed to hold loads up to six quintals (and mounted on a platform and serves to put on top of the tools) and when I carry out the analysis of the efforts even with eight on the arm remains green we say I have a little oversized to be sure since and my first work as a designer. Now we get to my problem. applying huge loads also of the order of 10 to 5 kg the arm does not break becomes completely red and true but you do not understand where and if c and break c and only an immense deformation. Is it possible that inventor not simultaneous the breaks? and if you like I do? as always thanks
umberto

 

[re_solidworks]

Your request amazes me. that I know no fem simulates "ruptures" but are reported areas of high tensions that could break.
Besides the mere reporting of the fem it is necessary to know how to interpret the data and it is necessary to refer to a norm, to the evaluation of effects of carving, to the evaluation of welds (which must be modeled to make a reliable project), to the cycles of fatigue etc...
if you know these factors with certainty and you know how to implement them properly proceed as well, but if you insert 2 constraints a load without knowing the extremely thorough way the matter... I recommend you to let it go.

 

[pompeo79]

quoto re_solidworks

 

[cassero88]

Your request amazes me. that I know no fem simulates "ruptures" but are reported areas of high tensions that could break.
Besides the mere reporting of the fem it is necessary to know how to interpret the data and it is necessary to refer to a norm, to the evaluation of effects of carving, to the evaluation of welds (which must be modeled to make a reliable project), to the cycles of fatigue etc...
if you know these factors with certainty and you know how to implement them properly proceed as well, but if you insert 2 constraints a load without knowing the extremely thorough way the matter... I recommend you to let it go.

thanks re I have no problem interpreting the data at least regarding all the theory that I studied was just simple curiosity I have no problem to see and calculate the effects of carving and other parameters and only that I have to do so much experience having only in hand my graduation and the culture that the exams gave me...
umberto

 

[paulpaul]

because on paper we are mechanical engineers (for whom it is) and so we are all the same we have done the same studies and we should know all the same as always and the experience it serves and if instead of denigrating and giving you some helpers would be better. . .

to answer: the fem mainly calculates efforts and deformations of a stressed and bound body in various ways, solving numerically the differential equations that bind the efforts to deformations applicable to the continuous (in the hypothesis of small shifts) that can be found in any text of construction science. once the body breaks, these are no longer valid and the resulting rigid motion should be described with the laws of rational mechanics. the fem calculates the first part, but knowing the characteristics of the material and other factors (fatigue, carvings, finishes, etc.) you should be able to understand when and where it breaks even if you do not see it physically on the fem.
I have seen that there are valid strutturists here on the forum that can definitely help you.
Hi.

 

[MBT]

and then I think it would also be time to end it with this superiority................... If instead of denigrating and giving you air help you would be better. . .

the good king did not want to denigrate you, but only to "advent you"
the world of calculation fem is vast and demands basic knowledge. You can't improvise, you can't make mistakes with catastrophic consequences.
You asked a "innocent" question, of course. but the question shows that the basics are lacking.
it is true that no one "is born learned", but it is also true that before approaching an instrument should be doverso "knowledge" especially regarding limits and potential

 

[PierArg]

And then I think it would be time to end it with this superiority... If instead of denigrating and giving you air help you would be better. . .

quoto mbt!
Look that King Solidworks responded politely and politely. He didn't want to offend anyone.

I answer with the phrase that appears in the queue to mbt messages

"do not ask questions if you are not sure how to accept the answer....:smile:"


As for what came to mind by reading (pardon...deciphering) the message in which you get angry with the world is this:
"try to improve punctuation":tongue:
It's not a criticism!:biggrin:

 

[SAUZER]

I quote all colleagues.
They simply warned you that to deal with such a problem you must have full awareness of the tool you are using and how to "interpret" the problem you are telling him to solve.
This results in knowing the physics of the problem and, knowing the software resolution procedures, knowing how to model it so that the mandatory simplifications that are being made are eligible for the problem under review.
However I understand why I found myself in your condition, and thanks to the advices of this forum I realized that I could not embark on a business without knowing all that is below. punishment for clamorous mistakes.
No one discouraged you. Hi.

 

[Fulvio Romano]

However, to say mine, no, that I know there is no program that shows the fractures. simply shows the tension, then you know the material and you know with what reference voltage to design and with what safety factor.
Besides, you talk red. "red" does not mean material in crisis, but refers only to the color scale, however hand-set. the colors serve only for two reasons:
1. facilitate reading
2. more importantly, having jpg to print color lasers and hand them to commercials.

just to clarify, a sizing is one thing, a study of fracture propagation is quite another topic. If the fem "drawn" a fracture should make a whole series of extra accounts that do not interest.

 

[MBT]

Besides, you talk red. "red" does not mean material in crisis, but refers only to the color scale, however hand-set. the colors serve only for two reasons:
1. facilitate reading
2. more importantly, having jpg to print color lasers and hand them to commercials.

holy words...
above all the second reason is to say little fundamental!

 

[re_solidworks]

And then I think it would also be time to end it with this superiority... ..if instead of denigrating and giving you some helpers would be better. . .

Look, you didn't understand anything I told you. First of all, I want to point out that I never have a haughty attitude, nor on the forum, nor in normal life, it is evidence that all those who have read some of my intervention in the past have intervened in my defense.
I'm not an engineer, and I'm not a fem. I am a mechanical expert left ignorant because when it was time I had no sufficient resources to face the university and I had to break. . Although studying I liked it, even if I could well in my studies....
I don't want to give you absolutely theory lessons but given the gaps and inexperience (which everyone has when they start) that you have demonstrated with your question I urge you to understand that the degree you have obtained is the initial and indispensable basis to cope well with the work that you will wish to do well in the future.
I urge you to take the right steps, without rush and without presumption. It is a proven fact that the school and university give an increasingly poor preparation and testifies to the fact that an engineer never used a fem during the graduation.
If I can afford to give you advice, without presumption and for your sake it is to go to work alongside your prepared senior colleague, who will teach you the secrets of the trade.
I urge you to reflect on the fact that your mistakes could cause serious damage not only to things, but also to people.
I work in the amusemet industry and you know how many times unprepared engineers with the presumption of knowledge have caused serious accidents with wounded and dead? what weight would it have on your conscience to know that your arm collapsed over a worker who dying left wife and two young children?
all must learn, but certain professions are delicate and must not be wrong. I'm sorry but you're wrong I'm getting started, your job is not learning on the internet or on a forum, you learn working alongside those who already know it thoroughly and who prevents your mistakes with experience.
I have already stretched too much, I wish you to become a great professional:finger:

 

[Mike1967]

cut skin


regarding advice (yes, are not orders advice) to go to do a course I find nothing wrong with: self-learning can go well to some point, but to enter some areas you need a course that, considering your level of preparation, will be advanced.
If you are an engineer you need to learn how to evaluate the various options you cannot get to a theory by discarding all other alternatives a priori: You took the conclusion that you were told... " but lasa perd, dag from food to the monkey and toca nagot" (think they are Sicilian)... observe, currency and reflect.
Hi.

 

[pompeo79]

:finger: già...