Material Testing Fixture April 26, 2013 Matt Garcia, Randy - - PowerPoint PPT Presentation

▶
material testing fixture april 26 2013 matt garcia randy
SMART_READER_LITE
LIVE PREVIEW

Material Testing Fixture April 26, 2013 Matt Garcia, Randy - - PowerPoint PPT Presentation

Sep 18, 2022 240 likes •525 views

Material Testing Fixture April 26, 2013 Matt Garcia, Randy Jackson, Jeremy Mountain, Qian Tong, Hui Yao Sponsor: Dr. Cornel Ciocanel College of Engineering, Forestry and Natural Sciences 1 Northern Arizona University Overview 1.

slide-1
SLIDE 1

Material Testing Fixture

College of Engineering, Forestry and Natural Sciences Northern Arizona University

April 26, 2013 1

Matt Garcia, Randy Jackson, Jeremy Mountain, Qian Tong, Hui Yao

Sponsor: Dr. Cornel Ciocanel

slide-2
SLIDE 2

Overview

1. Project Introduction 2. Current Fixture 3. Our Solution Design 4. Prototyping 5. Material Selection 6. Analysis 7. Manufacturing 8. Final Product 9. Budget

2 Matt Garcia

slide-3
SLIDE 3

Project Introduction

3

Magnetic Shape Memory Alloys (MSMA’s)

  • Nickel-Manganese-Gallium
  • Magnetic Elongation of 6%
  • $1,000/specimen

Unknown Material Properties

  • Mathematically Model
  • Actuators
  • Switches

Matt Garcia

slide-4
SLIDE 4

Problem Statement

Need: The eccentric loading of the test specimens causes fatigue failure. Goal: Design an improved material testing fixture that can perform tension and compression tests.

4 Matt Garcia

slide-5
SLIDE 5

Constraints

1. Fixture must accommodate specimen – 3 x 3 x 20 [mm] 2. Fixture must perform tension and compression tests 3. Exposed length of specimen – 10 [mm] 4. Fixture must not damage specimen 5. Fixture must be non-magnetic 5. Distance between magnets – 10 [mm] 6. Fixture must be axially aligned – 50 [µm]

5 Matt Garcia

slide-6
SLIDE 6

Current Fixture– Tip

  • Eccentric loading
  • Only compression test capable
  • Poor tolerances

6 Qian Tong

slide-7
SLIDE 7

Current Fixture – Base

  • Screw for alignment
  • Instability due to length of rod
  • Small diameter
  • Requires spacers for alignment

7 Qian Tong

slide-8
SLIDE 8

Our Solution

8

  • Collet Tip / Sleeve
  • Upper Push Rod
  • Lower Push Rod
  • Washer

Jeremy Mountain

slide-9
SLIDE 9

Solution Design – Tip / Sleeve

  • Tension – Tines
  • Axially aligns specimen
  • Variable specimen size
  • Compression - Post

9 Jeremy Mountain

slide-10
SLIDE 10
  • Extruded cylinder for alignment
  • Reduced overall height
  • Tightening slot

10

Solution Design – Upper

Jeremy Mountain

slide-11
SLIDE 11

11

Solution Design – Lower

  • Cylinder cutout for alignment
  • Reduced overall height
  • Tightening slot
  • Micrometer slot

Jeremy Mountain

slide-12
SLIDE 12

Solution Design – Assembly

12 Jeremy Mountain

slide-13
SLIDE 13

Prototyping

  • Tip
  • Sleeve
  • Taper for tightening

13 Qian Tong

slide-14
SLIDE 14

Prototyping – Cont.

  • Lower push rod
  • Assembled

14 Qian Tong

slide-15
SLIDE 15

Prototyping – Cont.

15 Qian Tong

  • Proof of concept
  • Tension & compression
slide-16
SLIDE 16

Material Selection

Available Materials

1. Stainless Steel 316 2. Aluminum 7075 – T6 3. Aluminum 6061 – T6 4. Brass

Final Design

  • Aluminum 7075 – T6
  • Hardness
  • Non-magnetic properties
  • Machinability

16 Randy Jackson

slide-17
SLIDE 17

Analysis – Hand Calculations

17 𝜏 = 𝑁𝑑 𝐽

  • Cantilever beam analysis
  • Alum. 7075 –T6 material

properties Factor of Safety: 3.98

𝜀𝑛𝑏𝑦 = − 𝐺𝑚3 3𝐹𝐽 𝑁 = 𝐺𝑚 Randy Jackson

slide-18
SLIDE 18

Analysis – SolidWorks

18

  • Confirmed with

SolidWorks

Factor of Safety: 3.51

Randy Jackson

slide-19
SLIDE 19

Analysis – COSMOS/M

19

  • Confirmed with

COSMOS/M

Factor of Safety: 3.53

Randy Jackson

slide-20
SLIDE 20

Manufacturing

20

  • Tolerances are critical

Machining Options

  • NAU Machine Shop
  • Elrod Machine &

Manufacturing Inc.

  • David Barnes Company

Hui Yao

slide-21
SLIDE 21

21

Manufacturing – Cont.

  • Small scale causes difficulty in manufacturing
  • Tolerances are critical
  • EDM – Electro Discharge Machining

Hui Yao

slide-22
SLIDE 22

Final Product

  • Silicon sleeve built into design

22 Hui Yao

slide-23
SLIDE 23

Final Product – Cont.

Problem

  • Incorrect outer diameter

Solution

  • Pressure fit brass washer

23 Hui Yao

slide-24
SLIDE 24
  • Achieved axial alignment
  • No damage to specimen
  • Tension & compression capable
  • Simplified design

24

Final Assembly

Hui Yao

slide-25
SLIDE 25

Budget

  • Loose budget limits due to research
  • Theoretical

Prototyping: $700 USD Machining: $3,000 - $5,000 USD Total Cost: $6,000 USD

25 Randy Jackson

slide-26
SLIDE 26

Conclusion

1. Identify Problems & Needs – Eccentric loading 2. Define Constraints : Axial alignment / magnet distance 3. Concept Generation – Design stage iterations 4. Final Design Selection – Collet tip style design 5. Analysis – Safety factor against yielding 6. Prototyping – 3D printing: push rod / sleeve / tip 7. Manufacturers Drawings – GD & T 8. Manufacturing – Mark Plourde @ David Barnes Company 9. Final Modifications – Press fit washer

  • 10. Presented Final Product

26 Randy Jackson

slide-27
SLIDE 27

References

http://www.davidbarnescompany.com http://www.goodfellow.com http://www.engineershandbook.com/Tables/frictioncoefficients.htm http://www.engineersedge.com http://www.alibaba.com http://www.tcdcinc.com http://www.engineeringtoolbox.com/friction-coefficients-d_778.html http://www.youtube.com/watch?v=sPwURRG9_Gs http://nau.edu/Research/Feature-Stories/NAU-on-Leading-Edge-of- Smart-Materials-Research/ Shigley’s Mechanical Engineering Design, 9th Edition. Mark Plourde – David Barnes Company

  • Dr. Cornel Ciocanel

27