Date : 5/26/2021 2:56:45 PM
From : "Ziv Ungarish"
To : "최재훈"
Cc : "almogbiton10@gmail.com"
Subject : Re: ABI Device
Attachment : 20210526_174422.jpg;image002.jpg;


Dear JaeHoonChoi,


I will try to clarify question 8. Please see the attached file that shows a sketch of the L-D curve. The first two cycles are flawed because of surface effects in the sample, and that will have a negative effect on the measured properties. How can we overcome these two flawed cycles? Maybe a preload (as marked in the sketch)? Maybe these cycles could be neglected in the analysis.


Please feel free to ask for any additional clarifications.


Thank you,

Ziv Ungarish




From: 최재훈 <jhchoi@frontics.com>
Sent: Thursday, May 20, 2021 10:44 AM
To: 'אלמוג ביטון'
Cc: Ziv Ungarish
Subject: RE: ABI Device
 

Dear Almog Biton,

 

Thanks for your clarification and I will share the question with our engineers.

I would like to ask more detail explanation for the question No.8.

I can’t understand what mean is. If possible, can you provide more information as detail as possible.

 

Best regards,

JaeHoonChoi.

Engineering&Marketing Dept.

Sales Engineer / JaeHoon Choi

E-mail : jhchoi@frontics.com

Website : http://www.frontics.com/

Tel: 82-2-884-8025, 82-2-875-8021

Fax: 82-2-875-8018

 

From: אלמוג ביטון <almogbiton10@gmail.com>
Sent: Thursday, May 20, 2021 3:09 PM
To: 최재훈 <jhchoi@frontics.com>
Cc: ZivU@nrcn.gov.il
Subject: ABI Device

 


 

Dear JeaHoon Choi,

 

How are you?

I hope you are doing well.

 

I would like to introduce two engineers who work with me on the ABI team in my lab., Eng. Ziv and Eng.Ilan.

On this occasion I would like to create for them a direct channel in front of you for future ABI questions.

We start to do our experiments and we have some questions:

  1. What's the diameter of the spherical indenter?
  2. What's the elastic modulus of the spherical indenter?
  3. How do we export the force-displacement curve data to excel?
  4. How do we export the stress-strain curve data points and their fitting equation to excel?
  5. What's the difference between type 1 and type 6 in the tensile properties analysis? We have analyzed some aluminum specimens using both types, and we kept getting exactly the same results (our requirement was that type 6 will be used for Al 1100).
  6. We have tested Al 6061-T6 and obtained tensile properties using different material types. Only the analysis with type 3 gave us relatively accurate yield stress results (compared to standard tensile test results), even though Al 6061 is supposedly a type 1 alloy according to the manual guide. What is the reason? What is your recommendation on how to choose the material type for accurate analysis?
  7. We performed ABI tests and obtained force-displacement curves that look absolutely standard, yet when we analyzed the results, sometimes the program couldn't finish the analysis. It doesn't even show an error message, the analysis progress bar just stops progressing. Restarting the software or the computer doesn't help. When we indent again at another location on the specimen and get a similar force-displacement curve, suddenly the program can analyze it. We would like to know why the software can't analyze the data from the first indentation.
  8. Can a testing preload be set? Sometimes the sample has slight surface effects, making the first one or two cycles defective and unrepresentative of the material bulk. A small preload or an option to ignore selected parts of the force-displacement curve could offer a solution.
  9. In the .txt file, the first row is shifted by one column. Can this be fixed?

Please help.

 

Best regards,

Eng. Almog

Eng. Ziv

Eng. Ilan