Resistance Behavior of Resistance Behavior of Transforming Material - - PowerPoint PPT Presentation

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Resistance Behavior of Resistance Behavior of Transforming Material - - PowerPoint PPT Presentation

Jun 15, 2023 369 likes •570 views

Resistance Behavior of Resistance Behavior of Transforming Material Transforming Material T Kotil * and H Sehitoglu Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign Y. I. Chumlyakov Siberian

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

T Kotil* and H Sehitoglu

Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign

  • Y. I. Chumlyakov

Siberian Physical and Technical Institute, Tomsk, Russia

* Currently at sabbatical leave from Aerospace Engineering Department

Istanbul Technical University, Istanbul, Turkey

Resistance Behavior of Resistance Behavior of Transforming Material Transforming Material

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

!Martensitic Transformation of Shape Memory

Alloys

!Electrical Resistance Measurement Techniques

and Application in Material Science

!Variation of Electrical Resistance During

Thermal and Mechanical Loading of the Shape Memory Alloys

!Conclusion

Electrical Resistance Behavior Electrical Resistance Behavior Of Transforming Material Of Transforming Material

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

!Martensitic Transformation !Determination of the Transformation

– Strain Measurement – Neutron Diffraction Techniques – Electrical Resistance Measurement

!Application of the Shape Memory Materials

– Non-Medical Application – Medical Application

Martensitic Martensitic Transformation of Transformation of Shape Memory Alloys Shape Memory Alloys

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

!Micro-Ohm Resistance Measurement !Slip Nucleation and Plastic Deformation !Determination of the Fatigue Life !Mechanical Behavior of the Thin Film !Transformation Behavior of Shape Memory

Alloys

Electrical Resistance Measurement Electrical Resistance Measurement and Application in Material Science and Application in Material Science

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Experimental System Experimental System

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Monotonic Tensile Loading Monotonic Tensile Loading

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

800 700 600 500 400 300 200 100 Stress [MPa] 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Strain [%] 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 ∆R/R Stress-Strain Resistance-Strain NiTi10Cu[012] ε = 5% 100°C 20°C

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

(Fe29Ni18Co4Ti Shape Memory Material) (Fe29Ni18Co4Ti Shape Memory Material)

4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Strain [%] 300 250 200 150 100 50

  • 50
  • 100

Temperature

  • C
  • 1.0
  • 0.8
  • 0.6
  • 0.4
  • 0.2

0.0 0.2 0.4 0.6 ∆R/R Fe29Ni18Co4Ti [CR] 1150

  • C 10 Min + 600
  • C 85 Min + WQ

Thermal Cycle, σ = 400 MPa Strain Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

( (NiTi NiTi Shape Memory Material) Shape Memory Material)

10 9 8 7 6 5 4 3 2 1 Strain [%]

  • 100
  • 80
  • 60
  • 40
  • 20

20 40 60 80 100 Temperature

  • C

1.0 0.8 0.6 0.4 0.2 0.0 ∆R/R NiTi [111] σ = 225 MPa Strain Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

( (NiTi NiTi Shape Memory Material) Shape Memory Material)

10 9 8 7 6 5 4 3 2 1 Strain [%]

  • 100
  • 80
  • 60
  • 40
  • 20

20 40 60 80 100 Temperature

  • C

1.0 0.8 0.6 0.4 0.2 0.0 ∆R/R NiTi [123] σ = 175 MPa Stress Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Strain [%]

  • 100
  • 80
  • 60
  • 40
  • 20

20 40 60 80 100 Temperature

  • C

0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 ∆R/R NiTi10Cu [011] σ = 0 MPa Strain Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

6 5 4 3 2 1 Strain %

  • 100
  • 80
  • 60
  • 40
  • 20

20 40 60 80 100 Temperature

  • C

0.6 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Trasformation Only) Strain (σ = 125 MPa) Strain (σ = 175 MPa) Resistance (σ = 125 MPa) Resistance (σ = 175 MPa) NiTi10Cu[012]

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Trasformation Only) 5.0 4.0 3.0 2.0 1.0 0.0 Strain % Heating Cycle Cooling Cycle NiTi10Cu[012] σ = 125 MPa σ = 175 MPa

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

200 180 160 140 120 100 80 60 40 20 Stress [MPa] 6 5 4 3 2 1

  • 1

Strain [%] 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0

  • 0.1

∆R/R (Trasformation Only) NiTi10Cu [111] Temperature = -60

  • C

Stress Resistance Recovery Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Cycle Test Thermal Cycle Test

( (NiTi NiTi Shape Memory Material) Shape Memory Material)

400 350 300 250 200 150 100 50 Stress [MPa] 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Strain [%] 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 ∆R/R (Transformation Only) NiTi [111] Temperature = 20 oC Stress Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Monotonic Tensile Loading Monotonic Tensile Loading

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

250 200 150 100 50 Stress [MPa] 5 4 3 2 1 Strain [%] 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Transformation Only) Thermal Recovery

X X

NiTi10Cu[111] ε = 5% Cycle 1 Stress Resistance 250 200 150 100 50 Stress [MPa] 5 4 3 2 1 Strain [%] 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Transformation Only)

Thermal Recovery

X X

NiTi10Cu[111] ε = 5% Cycle 2

Stress

Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Monotonic Tensile Loading Monotonic Tensile Loading

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

250 200 150 100 50 Stress [MPa] 5.0 4.0 3.0 2.0 1.0 0.0 Strain [%] 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Transformation Only) Thermal Recovery

X X

NiTi10Cu[012] ε = 5% Cycle 2 Stress Resistance 250 200 150 100 50 Stress [MPa] 5.0 4.0 3.0 2.0 1.0 0.0 Strain [%] 0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R (Transformation Only)

X X

Thermal Recovery NiTi10Cu[012] ∆ε = 5% Cycle 1 Stress Resistance

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Thermal Recovery Thermal Recovery

(NiTi10Cu Shape Memory Material) (NiTi10Cu Shape Memory Material)

5 4 3 2 1 Strain [%] 100 80 60 40 20 Temperature

  • C

0.5 0.4 0.3 0.2 0.1 0.0 ∆R/R NiTi10Cu [012] ε = 5% Cycle 1 Strain Thermal Recovery Resistance Thermal Recovery

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Mechanical and Industrial Engineering Department, The University of Illinois at Urbana-Champanig

Conclusions Conclusions

! Variation of the electrical resistance is a good

indication of the transformation.

! Resistance change due to the elasto-plastic

deformation is much smaller then the transformation.

! Electrical resistance is a better representation of

the transformation then the strain.

! A good relation is obtained between the amount of

transformation and resistance change during thermal cycle loading.

! Two-stage transformation is observed during

monotonic tensile loading but single stage during unloading period.