COVID-19: In these troubled times, NANOVEA devotes necessary resources to maintain all of the essential services you count on. Stay safe!
CONTACT SUPPORT CONTACT US

Category: Indentation | Yield Strength and Fatigue

 

Yield and Tensile Strength of Steel and Aluminum

Yield and Tensile Strength of Steel and Aluminum

Learn more
 

Importance of YS and UTS Measurement using Indentation

Traditionally YS and UTS have been tested using a large tensile testing machine requiring enormous strength to pull apart test specimens. It is costly and time-consuming to properly machine many test coupons for a material where each sample can only be tested once. Small defects in the sample create a noticeable variance in test results. Different configurations and alignments of the tensile testers in the market often result in substantial variations in testing mechanics and outcomes.

Nanovea’s innovative indentation method directly provides YS and UTS values comparable to values measured by conventional tensile tests. This measurement opens a new realm of testing possibilities for all industries. The simple experimental setup significantly cuts sample preparation time and cost compared to the complex coupon shape required for tensile tests. Multiple measurements on a single sample are possible with a small indentation size. It prevents the influence of defects seen in tensile test coupons created during sample machining. YS and UTS measurements on small samples in localized area allow for mapping and local defect detection in pipelines or auto structures.
 
 

Measurement Objective

In this application, the Nanovea Mechanical Tester measures the YS and UTS of stainless steel SS304 and aluminum Al6061 metal alloy samples. The samples were chosen for their commonly recognized YS and UTS values showing the reliability of Nanovea’s indentation methods.

 

 

Test Procedure and Procedures

The YS/UTS tests were performed on the Nanovea Mechanical Tester in the Microindentation mode. A cylindrical flat diamond tip of 200 μm diameter was used for this application. SS304 and Al6061 alloys were selected for their extensive industrial application and commonly recognized YS and UTS values, in order to show the great potential and reliability of the indentation method. Samples were mechanically polished to a mirror-like finish before testing to avoid surface roughness or defect influence on test results. Test conditions are listed in Table 1. More than ten tests were performed on each sample to ensure the repeatability of the test values.

 

 

Results and Discussion

Load-displacement curves of the SS304 and Al6061 alloy samples are shown in Figure 3 with the flat indenter imprints on the test samples inset. Analysis of the “S” shaped loading curve using special algorithms developed by Nanovea calculates YS and UTS. Values are automatically calculated by the software as summarized in Table 1. YS and UTS values obtained by conventional tensile tests are listed for comparison.

 

Conclusion

 

In  this  study,  we  showcased  the  capacity  of  Nanovea  Mechanical  Tester  in  evaluating  YS & UTS of stainless  steel and aluminum alloy sheet samples. The simple experimental setup significantly cuts the time and cost for  sample  preparation  required  for  tensile  tests.  The  small  indentation  size  makes  it  possible  to  perform  multiple measurements  on  one  single  sample.  This  method  allows  YS/UTS  measurements  on  small  samples  and localized areas, providing a solution for YS/UTS mapping and local defect detection of pipelines or auto structure.

The  Nano,  Micro  or  Macro  modules  of  the  Nanovea  Mechanical  Tester  all  include  ISO  and  ASTM  compliant              indentation,  scratch  and  wear  tester  modes,  providing  the  widest  and  most  user  friendly  range  of  testing  available in a single system. Nanovea’s unmatched range is an ideal solution for determining the full range of mechanical properties of thin or thick, soft or hard coatings, films and substrates, including hardness, Young’s modulus, fracture toughness, adhesion, wear resistance and many others.  In addition, optional 3D non-contact profiler and AFM Module are available for high resolution 3D imaging of indentation, scratch and wear track in addition to other surface measurements such as roughness.

 

Cyclical Nanoindentation Stress-Strain Measurement

Cyclical Nanoindentation Stress-Strain Measurement

Learn more

 

Importance of Nanoindentation

Continuous stiffness measurements (CSM) obtained by nanoindentation reveals the stress-strain relationship of materials with minimally invasive methods. Unlike traditional tensile testing methods, nanoindentation provides stress-strain data at the nanoscale without the need of a large instrument. The stress-strain curve provides crucial information on the threshold between elastic and plastic behavior as the sample is subject to increasing loads. CSM gives the capability to determine the yield stress of a material without dangerous equipment.

 

Nanoindentation provides a reliable and user-friendly method to quickly investigate stress-strain data. Furthermore, measuring stress-strain behavior on the nanoscale makes it possible to study important properties on small coatings and particles in materials as they get more advanced. Nanoindentation provides information on elastic limit and yield strength in addition to hardness, elastic modulus, creep, fracture toughness, etc. making it a versatile metrology instrument.

The stress-strain data provided by nanoindentation in this study identifies the elastic limit of the material while only going 1.2 microns into the surface. We use CSM to determine how mechanical properties of materials develop as an indenter travels deeper into the surface. This is especially useful in thin film applications where properties can be depth dependent. Nanoindentation is a minimally invasive method of confirming material properties in test samples.

The CSM test is useful in measuring material properties versus depth. Cyclical tests can be performed at constant loads to determine more complex material properties. This can be useful to study fatigue or eliminate the effect of porosity to obtain true elastic modulus.



Measurement Objective

In this application, the Nanovea mechanical tester uses CSM to study hardness and elastic modulus versus depth and stress-strain data on a standard steel sample. Steel was chosen for its commonly recognized characteristics to display the control and accuracy of the nanoscale stress-strain data. A spherical tip with a 5-micron radius was used to reach high enough stresses beyond the elastic limit for steel.

 



Test Conditions & Procedures

The following indentation parameters were used:

 



Results:

 

Increase in load during oscillations provide the following depth versus load curve. Over 100 oscillations were conducted during loading to find the stress-strain data as the indenter penetrates the material.

 


We determined stress and strain from the information obtained at each cycle. The maximum load and depth at each cycle allows us to calculate the maximum stress applied in each cycle to the material. Strain is calculated from the residual depth at each cycle from the partial unloading. This allows us to calculate the radius of the residual imprint by dividing the radius of the tip to give the strain factor. Plotting stress versus strain for the material shows the elastic and plastic zones with the corresponding elastic limit stress. Our tests determined the transition between the elastic and plastic zones of the material to be around 0.076 strain with an elastic limit of 1.45 GPa.






Each cycle acts as a single indent so as we increase load, we run tests at various controlled depths in the steel. So, hardness and elastic modulus versus depth can be plotted directly from the data obtained for each cycle.






As the indenter travels into the material we see hardness increase and elastic modulus decrease.



Conclusion





We have shown the Nanovea mechanical tester provides reliable stress-strain data. Using a spherical tip with CSM indentation allows for material property measurement under increased stress. Load and indenter radius can be changed to test various materials at controlled depths. Nanovea mechanical testers provide these indentation tests from the sub mN range to 400N.


Learn more about all the features our Nanovea Mechanical Tester offers.

3 Point Bend Test Using Microindentation

In this application, the Nanovea Mechanical Tester, in Microindentation mode, is used to measure the flexural strength (using 3 Point Bend) of various sized rod samples (pasta) to show a range of data. 2 different diameters were chosen to demonstrate both elastic and brittle characteristics. Using a flat tip indenter to apply a point load, we determine stiffness (Young’s Modulus) and identify the critical loads at which the sample will fracture.

3 Point Bend Test Using Microindentation

Please fill out the form below and
we will send the brochure to your email

Мелитэк | Melytec LLC

RUSSIA | BELARUS

34/63 Obrucheva st. bld.26
Moscow, 117342, Russia
+7 (495) 781-07-85

СВЯЖИТЕСЬ С НАМИ / CONTACT US

Nanovea Inc

HEADQUARTERS

6 Morgan Ste 156
Irvine, CA 92618
Phone: (949) 461-9292

CONTACT US

Please fill out our form and we will reach out to you as soon as possible!

Nanovea SRL

EUROPEAN OFFICE

Via Balegno 1
Rivalta di Torino
10040 TO (IT)
Phone: +39 011 3052 794

CONTACT US / CONTATTACI

Nanovea SRL

EUROPEAN OFFICE

Via Balegno 1
Rivalta di Torino
10040 TO (IT)
Phone: +39 011 3052 794

CONTACT US / CONTATTACI

Nanovea S.A. de C.V.

LATIN AMERICA

1952 Hidalgo
Colonia Ladron de Guevara
Guadalajara, Jalisco
Mexico 44600
Phone: +52 1 33 10 31 52 27

CONTACT US / CONTÁCTENOS

MICRO-NANO Technology Co. Ltd

CHINA | TAIWAN | HONG KONG

• BEIJING
Room 081-082,2/F,Dongqu, Yiqing Building
No 38 Guangqulu
Chaoyang District
Beijing China/100022
+86 10 51649103
Mobile: 15321352298

• SHANGHAI
Room 703, No. 578 Tianbao Road,
Shanghai China
Mobile: 15801657153

CONTACT US / 联系我们

Tribotron AG

SWITZERLAND | AUSTRIA

Lerchenfeldstrasse 3
CH-9014 St.Gallen
+41 71 511 24 65

CONTACT US / KONTAKTIERE UNS

Mi-Net Technology Ltd. UNITED KINGDOM | IRELAND 30 Summerleaze Road Maidenhead Berks SL6 8EN United Kingdom +44(0) 1628 783576

CONTACT US

Please fill out our form and we will reach out to you as soon as possible!

160-0023

株式会社日本サーマル・コンサルティング

東京都新宿区西新宿1-5-11新宿三葉ビル5F

 

+81(0) 3 5339-1470

問い合わせ / CONTACT US

Nanovea Inc

HEADQUARTERS

6 Morgan Ste 156
Irvine, CA 92618

Phone: (949) 461-9292

CONTACT SUPPORT

Please fill out the form below. We will reach out to you as soon as possible. If it is urgent, feel free to call (949) 461-9292

Nanovea Inc

HEADQUARTERS

6 Morgan Ste 156
Irvine, CA 92618
Phone: (949) 461-9292

CONTACT US

Please fill out our form and we will reach out to you as soon as possible!

Please fill out the form below and
we will send the brochure to your email

Nanovea S.A. de C.V.

LATIN AMERICA

1952 Hidalgo
Colonia Ladron de Guevara
Guadalajara, Jalisco
Mexico 44600
Phone: +52 1 33 10 31 52 27

CONTACT US / CONTÁCTENOS

Nanovea SRL

EUROPEAN OFFICE

Via Balegno 1
Rivalta di Torino
10040 TO (IT)
Phone: +39 011 3052 794

CONTACT US / CONTATTACI

Nanovea S.A. de C.V.

LATIN AMERICA

1952 Hidalgo
Colonia Ladron de Guevara
Guadalajara, Jalisco
Mexico 44600
Phone: +52 1 33 10 31 52 27

CONTACT US / CONTÁCTENOS

Altmann S.A. Importação e Comércio

BRAZIL

Av. Dr. Chucri Zaidan, 1550 Edifício Capital Corporate 17º andar- conjunto 1701
04711-130 – São Paulo – SP – Brazil
+55(11) 2198-7198
P: +55(11) 5507-3302

CONTATE-NOS / CONTACT US

Nanovea Inc

HEADQUARTERS

6 Morgan Ste 156
Irvine, CA 92618
Phone: (949) 461-9292

Send us a request!

Please fill out our form and we will reach out to you as soon as possible!

Nanovea India Private Limited

INDIA

#1112, 2nd Stage,
17th Cross, Banashankari
Bangalore, Pin: 560 060

CONTACT US

Nanovea India Private Limited

INDIA

#1112, 2nd Stage,
17th Cross, Banashankari
Bangalore, Pin: 560 060

CONTACT US

Nanovea India Private Limited

INDIA

#1112, 2nd Stage,
17th Cross, Banashankari
Bangalore, Pin: 560 060

CONTACT US

Please fill out the form below and
we will send the brochure to your email

Please fill out the form below and
we will send the brochure to your email

Want us to test your samples?

Please fill up our form and we will reach out to you soon!