How to perform a puncture test using the Mach-1

How to perform a puncture test using the Mach-1

Equipment: 

  1. https://www.biomomentum.com/accessories/sample-holder-puncture-fixtures/
  2. https://www.biomomentum.com/accessories/kit-of-spherical-indenters/
  3. https://www.biomomentum.com/mechanical-testers/mach-1-v500c/
There is no general standard for the puncture test, you will need to base yourself off published articles for this.


Here is a good starting point where we performed the puncture of heart valve leaflets:
https://www.biomomentum.com/case-studies/validation-of-a-conditioning-and-rupture-test-method-for-pulmonary-valve-cusps/

Based on this article: https://www.sciencedirect.com/science/article/abs/pii/S1751616112001221?via%3Dihub

The programming looked something like this:

1.     Approach indenter approximately 2mm above the aperture and execute the following sequence to find the surface of the sample:

Functions

Parameters

Zero Load

N/A

Find Contact

Stage Axis: Position (z)

Load Cell Axis: Fz

Direction: Positive

Stage Velocity, mm/s: 0.100

Contact Criteria, gf: 10.00

Stage Limit, mm: 10

Stage Repositioning: None

Zero Position

N/A

                        

2.     Execute the following sequence to perform the pre-conditioning cycles:

Functions

Parameters

Find Contact

Stage Axis: Position (z)

Load Cell Axis: Fz

Direction: Positive

Stage Velocity, mm/s: 0.417 (25 mm/min)

Contact Criteria, gf: 500

Stage Limit, mm: 10

Stage Repositioning: None

Save data as “___.txt”

Move Absolute

Amplitude, mm: 0.000

Velocity, mm/s: 0.417

Save data as “___.txt”

Repetitions

3

3.     Wait 5 minutes for the tissue to return to its normal state (ensuring the tissue stays hydrated over this time).

4.     Execute this final sequence to perforate the sample:

Functions

Parameters

Zero Load

N/A

Find Contact

Stage Axis: Position (z)

Load Cell Axis: Fz

Direction: Positive

Stage Velocity, mm/s: 0.100

Contact Criteria, gf: 10.00

Stage Limit, mm: 10

Stage Repositioning: None

Move Relative

Amplitude, mm: 8.000

Velocity, mm/s: 0.417

Save data as “___.txt”



    • Related Articles

    • How to prevent water damage/infiltration into Mach-1 motors

      When using water or other solution with the Biomomentum Mach-1, it is possible to misuse the accessories and leak water into the Mach-1's motors underneath. To prevent water damage in the Mach-1 X, Y and Torsion axes, it is recommended to use bench ...
    • DAQmx Self-Test (Error: -88705)

      This error is usually caused by having an incorrect DAQ# in the Mach-1 Motion configuration file. Windows can sometimes change this number during a Windows Update. To fix this, the DAQ number can be changed in the Mach-1 Motion Configuration/Hardware ...
    • No data stream when opening Mach-1 Motion, then Error -88705 after a few minutes

      The general Error -88705 can be solved using the following method: https://support.biomomentum.com/portal/en/kb/articles/daqmx-self-test-error-88705 In this specific case of the error, there is a blank screen (no load cell data is shown) for a few ...
    • General Creep function advice for the Mach-1 Motion software

      Here are some recommended starting parameters: Start at P = 0.001, I = 0. If load (e.g. 3000gf) was not reached, increase to P = 0.01, I = 0. Repeat with by increasing again to P = 0.1 if load was again not reached. If the motor starts to overcorrect ...
    • Questions and Answers regarding the Hayes model (1972)

      What is the Hayes model (1972)? The Hayes model is a mathematical model developed for indentation tests of articular cartilage. The articular cartilage is modeled as an infinite elastic layer of a certain thickness bonded to a rigid half space. This ...