Why is my material testing machine throwing out errors at speeds over 250mm/min?

[romascenko]

We have a problem with mentioned machine when making tests at speed like below 250mm/min its ok but if we go over that speed machine throws out error its like that the machine hasnt got enough power and because there is not smooth working programm shut down test. If i do a speed ramp to go up from 50 to 500mm/min its working ok if i start with higher speed than it throws out.

 

[ChemAir]

What kind of material testing machine are we talking about?

 

[romascenko]

mechanical tests like tensile , compression etc

 

[anorlunda]

You may be overloading the motor by not only stirring but accelerating the mass too fast.

But we would need a lot more details about the machine, the error, and the experiment to give a better quality answer.

 

[romascenko]

Its a tension machine and the test is without any load just simple movement of traverse. If there is any load error happens even at lower speeds. And if i start moveing traverse step by step from 50 to 500 there will be no problem. If i do a start with speed 250mm/min it will shut down it will try to start but fail it looks like its abnormal heavy load but its actually without load.

So if we do a step by step speedup it ll be ok. It ll reach its max speed.
If i start with middle speed it ll shut down.

https://en.m.wikipedia.org/wiki/Tensile_testing

 

[jrmichler]

When we ask you to describe the testing machine, we mean:
Does it have a motor, reducer, and lead screw?
Does it have a motor, reducer, and ball screw?
Is it hydraulic? If so, hand valve or servovalve?
New or old? If old, how well has it been maintained?
Manufacturer and model.
And the answers to the next 10 to 20 questions. Maybe a photo or two.

You have a master's degree. Use that background to (1) think of what we need to know to help you, (2) how to communicate that information to us, and (3) communicate it. Then we can help.

 

[Astronuc]

With a gage length of 50 mm, the 250 mm/min (or 4.17 mm/s) produces a strain rate of ~0.08 /s. That is a relatively fast strain rate, and may require a special machine or program. What is the capability and/or range of calibration for the machine? For that matter, what is the brand/model of the machine, what testing standard is being employed, and what material is being tested? I'm assuming room temperature, but one could be testing at elevated temperature.

I recently reviewed data from a program that performed tensile tests on an alloy from room temperature to ~920 C, and strain rates from 1 E-5 to 100 /s. Different machines were required. Typical uniaxial strain rates for materials are around 1 E-5 to 1E-4 /s, which are useful for static loads or slow loadings. Dynamic loads are another matter.

 

[romascenko]

http://instron.us/en-us/products/testing-systems/universal-testing-systems/electromechanical/3300/3380-floor-model

I think all your Qs are here on this link.
Its like 10 years old it has been regulary serviced etc...

 

[jrmichler]

You have a master's degree. Use that background to (1) think of what we need to know to help you, (2) how to communicate that information to us, and (3) communicate it. Then we can help.

A catalog description of a family of testing machines tells us almost nothing. You need to specifically describe your machine, the test specimen, loads and forces, and specifically what is happening and under what conditions. Pretend that you are writing the chapter of a master's thesis titled "Experimental Setup". Then condense it to one page and post it here.

 

[ChemAir]

Have you contacted the manufacturer for support or read the troubleshooting guides on the site you linked?
http://www.instron.us/-/media/liter...0-dual-column-floor-frames-system-support.pdf
http://www.instron.us/-/media/liter...0-dual-column-table-frames-operator-guide.pdf
http://www.instron.us/-/media/liter...0-dual-column-table-frames-system-support.pdf

A link to the manufacturer of a machine falls short of explaining how it is being used, and what it is being used for.

 

[Astronuc]

http://instron.us/en-us/products/testing-systems/universal-testing-systems/electromechanical/3300/3380-floor-model

I think all your Qs are here on this link.
Its like 10 years old it has been regulary serviced etc...

So, the machine one is using is an Instron 3380? As jrmichler indicated, describing one's 'Experimental Setup' would help us understand more about the situation. Simply providing a link to a manufacturers description does not tell us how the machine is being used in one's situation. For example, the manufacturer's information does not specify procedures, e.g., https://www.astm.org/Standards/E8.htm or https://www.astm.org/Standards/A370.htm. There are other standards for other materials, and for testing metals at elevated temperature. There are also ISO standards. For example, https://www.iso.org/standard/51081.html, and https://www.iso.org/standard/43441.html

 

[romascenko]

Thx for help but i have solved it problem is leeking capacitor. :) If any more Q i will try to answer them.