Tensile machine performance
Tensile machine performance
(OP)
Dear All,
I am going to purchase a tensile tester for a testing lab. I am quite puzzling in choosing a tester with good performance and high reliability, repeatability and accracy. Would anybody can help me by giving suggestions and comments?
Thanks a lot!
I am going to purchase a tensile tester for a testing lab. I am quite puzzling in choosing a tester with good performance and high reliability, repeatability and accracy. Would anybody can help me by giving suggestions and comments?
Thanks a lot!





RE: Tensile machine performance
http://www.instron.com/universal_testing/index.asp
http://www.instron.com/universal-hydraulic/index.asp
RE: Tensile machine performance
RE: Tensile machine performance
The size of the machine depends on what you are going to test - the load cell for testing thin sheet and film will be much smaller than for something as big and strong as gas pipe. Have a look at Lloyd Instruments as well, at http://www.lloyd-instruments.co.uk/
Regards,
Peter P
RE: Tensile machine performance
RE: Tensile machine performance
MTS corporation also makes tensile testing machines.
check both Instron and MTS.
www.mts.com
RE: Tensile machine performance
Thanks for your information.
By the way, I heard from my friend that he has encountered problems using Lloyd tenisle machine. When testing the same plastic samples in a resonable specimen size, the modulus is always smaller than others.
I would like to know whether there is any comment since the price of Lloyd fits our budget!
Many thanks.
RE: Tensile machine performance
I have found the Lloyd instument to be reliable. Tell your friend that the only only way that the machine can give a wrong modulus is if the load cell has not been calibrated properly. Tell him to have the cell recalibrated. The only other way is to use the wrong dimensions for the test specimen.
Regards,
Peter P
RE: Tensile machine performance
Also check out the Tinius Olsen site: www.tiniusolsen.com they have a wide selection of machines from 225 lbs to 20,000 lbs. Tri-Lingual of course.
They also have a horizontal machine which is extremely accurate, made for high production testing, from low elongation <2% to high elongation >1000% elongation through break and it is an automation ready system.
The BT series machines offer the same accuarcy as the Instron and MTS systems at 2/3 the cost, the ability to use laser extensoemter, high elongation (POGO Stick type Extensometers) and chambers to 600 Deg. F.
Give them a call. 215-675-7100.
GFTHELEN
RE: Tensile machine performance
The modulus calculation (Delta Stress / Delta Strain) is dependent upon BOTH load and Elongation. If you are using a clip-on extensometer you have to make sure BOTH the LOAD and Strain are calibrated.
If you are using the crosshead position as the elongation device you have to account for the materials slipping out of the grips. If it is a low elongation material, the slip can be a big portion of the total strain and will screw the Modulus.
For high elongation materials, you have to account for the distance between the grips, the problem is with the Dog-Bone cut specimens assume the only place it stretches is in the reduced section, this is wrong and should only be used as a reference. The tab section elongates quite a bit.
To accurately determine the Modulus you have to use a calibrated extensometer for strain measuring and a load cell.
The measurement of the sample is also important the thickness having the most effect on the results.
GFThelen