We fixed the problem according to Lance's instruction by cleaning the tip totally.
Han's acknowledgement:
1. Do not keep sending our information to Benli.
2. Make a in-group discussion before passing the problem to Lance.
The software of TriboScan is now upgraded from 7.1.0.16 11/24/2004 to 7.1.1.05.
A new unknown window is found in the area indent section.
We met a big problem that the tip seems wrong and makes some unexpected contact to the sample.
Jerome Rudy and Sheng spent a whole day trying to fix the problem, but faild.
Problem discription:
When doing H-Pattern, it came out with an error about the contact depth exceeded its max 5um.
The curve is very much like an area indent: goes up for a bit than turn down below 0 fast.
Letter to Lance:
Hi Lance,
We got some trouble with the Triboscan today. When doing H-Pattern, it came out with an error about the contact depth exceeded its max 5um. (related curve included in the mail, "H-pattern Cal 0001.hys"). Then we did some tries (logs kept in "log.doc") and narrowed the problem within the Berkovich tip. There was one time(detailed information in log.doc)
when we could finish the indents however the results were uncommon(related curves included in the mail, "problem 12092007.hys" and "problem 12092007 2.hys").
Our analysis: Firstly the problem was narrowed within the tip. Secondly, the reason of this might be the tip detected a certain contact before it really touched the sample. This could be from the mount between the tip and the transducer, like some dirt or crash in the screw in the back of the tip.
Lance's Reply:
Dear Sheng Liu,
From the curves that you sent, it really appears that there is some dirt
or debris on the tip or on the sample. If the tip has been used on a
soft material (like a polymer or biomaterial), it is easy to have
material stick to the indenter tip. This would need to be cleaned off.
I have attached the procedure for cleaning the tip to this email.
Because some of your problems are actually happening on the Aluminum
sample, you could skip the part of the procedure that would have you
make indents in the Aluminum.
If this does not fix the problem, then it may be related to something
loose on the system. I would make sure that the tip is fully tightened
into the transducer. Using the tip mounting tool, you can tighten the
tip until the tool will turn approximately 1/4 turn after the tip has
stopped moving. This will not damage the transducer, and will guarantee
that it is mounted well.
Best Regards,
Lance
This is the website for nanoindentation founded by Cornell Univ. in US. You can find useful information as well as a good forum in it.
The new booking form is introduced to the lab. There is nothing more in the form but please mark the transducer desired when booking your time. And also try to make your booking more effect if you are booking a transducer other than current one. (Meaning make some delay and ensure that the current transducer available to someone still needs it.)
Dr. Han Huang<han.huang@uq.edu.au>;
Wu Yueqin<s4131405@student.uq.edu.au>;
Rudy<r.irwan@uq.edu.au>;
Dr xiaoli YUAN<yuan.xiaoli@uq.edu.au>;
Sheng Liu<s4131615@student.uq.edu.au>;
Jenny<jennylinpt@hotmail.com>;
crichton michael<michael.crichton@uq.edu.au>;
Rathmell Adrian<s4076767@student.uq.edu.au>;
Han talked about nanoindentation experiment process and theory:
We discussed on how to distribute the time and the transducers for the machine in order to make the max efficiency. We also had a decision on making a more formal log book and instruction for using the machine.
Jerome will make a new box for the 1D transducer and Berkovich tip binded together.
Jenny will make a new instruction for safely using the machine.
Sheng will make new booking forms and log book.
