Download presentation

Presentation is loading. Please wait.

Published byDustin Shipley Modified over 3 years ago

1
Team Members: Zack Reinman Cristhyan Alfaro Travis Robinson Daniel Gilardoni Engineering 45 Dec, 2009 SRJC

2
Our primary goal was to study the relationship between the deformation of metals and there resistances Our secondary goal was study how annealing the metals would affect the resistance

3
Cold working started earlier than 5000 BC Current applications involve shaping and hardening Cold working is still done Byora USA Corporation Bellevue, WA 425-454-0708 Byora USA Corporation Stalcop Thorntown, IN 765-436-7926 Stalcop o Coldform, Inc. Terryville, CT 860-582-5031 Coldform, Inc.

4
Cold rolling, drawing, deep drawing, & pressing Takes place at room temperatures Grain shapes deform allowing for increase in resistivity http://www.the-warren.org/ALevelRevision/engineering/grainstructure.htm

5
Apply Heat to metal New Grains Grow Resistance decreases http://www.the-warren.org/ALevelRevision/engineering/grainstructure.htm

6
We wanted to cold work large sample and measure its resistance with a Wheatstone bridge Did not have high enough quality materials to build the circuit. http://en.wikipedia.org/wiki/Wheatstone_bridge

7
In order to use multimeter, we had to get a resistance that was in the range the multimeter can detect. To increase the resistance of the object we reduced its cross-sectional area, and increase its length.

8
Small cross section to increase resistivity No wheatstone bridge--- use multimeter

9
Calculate desired length for R >1 Cut and measure diameter and resistance

10
Cold work sample Measure dimensions and resistance

11
Things were a little tricky because we were going from round wire to a flat ribbon

12
Copper Conductivity (1/omh*m)Length (m)Area (m 2 ) Theoretical R (ohms) Expermental R (ohms)% Error Sample 16.00E+073.05.16892E-080.9673194991.058.55% Sample 26.00E+073.05.16892E-080.9673194991.058.55% Sample 36.00E+073.05.16892E-080.9673194991.113.72% Copper CW% CWLength (m) Conductivity (1/omh*m)Area (m 2 ) Theoretical R (ohms) Experimental R (ohms) R Change Due to CW (ohms) Sample 112.594.316.00E+074.5161E-081.59053.62.01 Sample 220.586.526.00E+074.1032E-082.64835.42.75 Sample 320.086.146.00E+074.1290E-082.47834.652.17

13
Average R Change =106% Average CW =17%

14
Brass Conductivity (1/omh*m)Length (m)Area (m 2 ) Theoretical R (ohms) Expermental R (ohms)% Error Sample 11.60E+0716.13116E-081.0191.437.34% Sample 21.60E+0716.13116E-081.0191.437.34% Sample 31.60E+0716.13116E-081.0191.437.34% Brass CW% CW Conductivity (1/omh*m) Length (m)Area (m 2 ) Theoretical R (ohms) Expermental R (ohms) R Change Due to CW (ohms) Sample 118.121.60E+071.235.01773E-081.532.250.72 Sample 219.461.60E+071.2354.93547E-081.562.250.69 Sample 323.721.60E+071.244.67418E-081.662.350.69 Average % R Change Due to about 20% CW=44%

15
Average R Change = 44% Average CW=20%

16
UnknownLength (m)Area (m 2 )Recorded R (ohms) Experimental Conductivity Sample 114.57303E-086.753.24E+06 Sample 214.57303E-086.853.19E+06 Sample 314.57303E-086.953.15E+06 Avg 3.19E+06 Guessed metal---Chromel Conductivity=1.3X10 6 (1/ohm*m) Unknown% CWLength (m)Area (m 2 ) Determined Conductivity Theoretical R (ohms) Expermental R (ohms) R Change Due to CW (ohms) Sample 117.721.445.38E-083.19E+068.3813.154.77 Sample 215.741.395.29E-083.19E+068.2312.254.02 Sample 317.081.414.92E-083.19E+068.9712.753.78

17
Average R Change=50% Average CW=17%

18
Find Annealing temperature for our three samples Determine the temperature we want to use We decided on 450 degrees F

19
We didn’t see any results so… Changed temperature to 650 degrees F Changed from metal to glass due surface area and heat capacity

21
Color Dimensions We later found our annealing temperatures were too low… Melting temp for: copper = 1983F Brass= 1710F

22
http://en.wikipedia.org/wiki/Work_hardening http://en.wikipedia.org/wiki/Work_hardening http://www.iqsdirectory.com http://www.iqsdirectory.com http://www.keytometals.com http://www.keytometals.com http://www.m-hikari.com/atam/forth/alquranATAM1-4-2010.pdf http://www.m-hikari.com/atam/forth/alquranATAM1-4-2010.pdf http://www.6mmbr.com/annealing.html http://www.6mmbr.com/annealing.html http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWS- 4N08MH6- 1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_s earchStrId=1124432364&_rerunOrigin=google&_acct=C000050221&_version=1 &_urlVersion=0&_userid=10&md5=1e79518e220bfa7b771916e670b0ea5b http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWS- 4N08MH6- 1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_s earchStrId=1124432364&_rerunOrigin=google&_acct=C000050221&_version=1 &_urlVersion=0&_userid=10&md5=1e79518e220bfa7b771916e670b0ea5b http://www.springerlink.com http://www.springerlink.com http://www.the-warren.org/ALevelRevision/engineering/grainstructure.htm http://www.the-warren.org/ALevelRevision/engineering/grainstructure.htm Malki, B., L. Peguet, and B. Baroux. "Influence of Cold Working on the Pitting Corrosion Resistance of Stainless Steels."Corrosion Science. Isbergues:Elsevier, April 2007. 1933-1948. "Materials Engineering; Study data from M. Gonzalez and colleagues update understanding of materials engineering. " Journal Engineering 12 Aug. 2009: Sciences Module, ProQuest. Web. 3 Dec. 2009.

Similar presentations

OK

Manufacturing Engineering Technology in SI Units, 6th Edition Chapter 15: Metal Extrusion and Drawing Processes and Equipment Presentation slide for.

Manufacturing Engineering Technology in SI Units, 6th Edition Chapter 15: Metal Extrusion and Drawing Processes and Equipment Presentation slide for.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on yoga and meditation Ppt on metro rail in india Ppt on home security systems Dr appt on the beach Ppt on attendance management system using rfid Ppt on learning styles Ppt on acid-base titration animation Ppt on applied operations research Marketing ppt on product Ppt on electric meter testing michigan