Talk:Strain gauge

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anyone can give me more information about strain gauges? notify me at jib_zbz@yahoo.com

Contents 1 Murphy's Law 2 Spelling 3 Piezoresistive effect 4 Temperature effects 5 Strain Gauge History 6 The size of a strain gauge 7 Introduction

[edit] Murphy's Law

I understand that the error made by the engineers in the Murphys Law story was that the strain gauges were wired up incorrectly in the Wheatstone bridge NOT that they were installed at 90 degrees. I quote the story at the linked page:

http://www.improbable.com/airchives/paperair/volume9/v9i5/murphy/murphy1.html

So I have altered this note slightly.--Turtle (talk) 21:59, 1 April 2008 (UTC)

If valid then why does it not have anything at the website quoted, it is neither on the page nor found with the search engine.

Also Murphy's law has no mention of it. Aether22 (talk) 23:04, 2 June 2008 (UTC)

[edit] Spelling

I'm not greatly fussed about "gage" and "gauge". But, if the article is "Strain gauge" and "Strain gage" redirects, then the spelling should be "gauge". If the article was "Strain gage" and "Strain gauge" redirected, then we should use "gage". Changed. Mr Stephen 22:20, 10 April 2006 (UTC)

[edit] Piezoresistive effect

The common metallic foil gauges do not use the piezoresistive effect, but rely on the geometric change, ie . Deleted. Mr Stephen 22:20, 10 April 2006 (UTC)

On re-reading, I realise that this may mislead. I don't dispute that ρ changes with strain. Mr Stephen 21:18, 12 April 2006 (UTC)

[edit] Temperature effects

It is quite hard to create strain-free dummy gauges that are at the same temperature as the specimen. The usual technique is to use gauges made of Constantan or another alloy with a small thermal coefficient of resistance and a three-wire connection. Mr Stephen 22:20, 10 April 2006 (UTC)

Done -- added to article. --75.41.34.231 17:41, 21 May 2007 (UTC)

[edit] Strain Gauge History

Although Edward E Simmons developed a woven gauge, it was Arthur Claude Ruge at MIT who, at the same time in 1938, developed the first practical gauge where resistance wire was glued to a backing material. (An introduction to Measurements using Strain Gauges HBM) Patrick1950 15:41, 4 December 2006 (UTC)

All references I could find credit Edward Simmons with the original invention of the strain gauge (though many credit him for inventing it in 1936, rather than 1938). If the Ruge strain gauge is such a notable type of strain gauge, I don't see why it shouldn't also be added to the article. --Karnesky 17:24, 4 December 2006 (UTC)

[edit] The size of a strain gauge

I think the typical dimensions of a strain gauge should be clearly listed in order to improve this article.

Define "typical". When I worked in a testing lab, I dealt with gauges ranging in size from 2mm x 1mm to 25mm x 10mm. --Carnildo 22:57, 10 February 2007 (UTC)

[edit] Introduction

It is not a good idea to have formulas in the introduction.--Kölscher Pitter (talk) 09:43, 10 January 2008 (UTC)