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

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Discussion Overview

The discussion revolves around issues encountered with a material testing machine that throws errors at speeds exceeding 250mm/min. Participants explore potential causes related to machine specifications, operational conditions, and the nature of the tests being conducted, including tensile and compression tests.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that the machine operates correctly below 250mm/min but fails at higher speeds, suggesting a potential power issue or programming error.
  • Another participant questions the type of material testing machine being used, seeking clarification on its specifications.
  • It is mentioned that the machine is a tension machine and that errors occur even at lower speeds when a load is applied, indicating a possible issue with the machine's response to load conditions.
  • Some participants propose that the motor may be overloaded due to rapid acceleration, emphasizing the need for more details about the machine and the specific errors encountered.
  • A participant discusses the strain rate associated with the testing speed, suggesting that the machine may require specific capabilities for higher strain rates.
  • Several participants emphasize the importance of providing detailed information about the machine, including its model, maintenance history, and the specifics of the experimental setup, to facilitate better assistance.
  • A participant shares a link to the manufacturer's product page, indicating that the machine is around 10 years old and has been regularly serviced.
  • One participant suggests contacting the manufacturer for support and reviewing troubleshooting guides, highlighting that a link to the manufacturer's description does not provide sufficient context for the machine's use.
  • The original poster later mentions that the problem was resolved due to a leaking capacitor.

Areas of Agreement / Disagreement

Participants express a range of views regarding the potential causes of the machine's errors, with no consensus reached on the specific issue until the original poster identifies a leaking capacitor as the cause.

Contextual Notes

The discussion reflects varying levels of detail provided by participants regarding the machine's specifications and operational context, which may influence the understanding of the problem.

romascenko
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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.
 
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What kind of material testing machine are we talking about?
 
mechanical tests like tensile , compression etc
 
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.
 
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
 
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.
 
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.
 
Last edited:
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 said:
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.
 
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romascenko said:
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
 
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Thx for help but i have solved it problem is leeking capacitor. :) If any more Q i will try to answer them.
 
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