Mar 23, 2017 20:35
7 yrs ago
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principle strain
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Mechanics / Mech Engineering
Hi,
Does anyone know what "principle strain" means here?
PhotoStress Separator Gages
If the sum of the ***principle strains*** can be determined at the same point where the difference in ***principle strains*** is measured, then the separate ***principle strain*** values are obtainable by simply solving equations simultaneously. The PhotoStress Separator Gage is based on this fundamental principle of mechanics.
http://www.vishaypg.com/micro-measurements/photo-stress-plus...
Does anyone know what "principle strain" means here?
PhotoStress Separator Gages
If the sum of the ***principle strains*** can be determined at the same point where the difference in ***principle strains*** is measured, then the separate ***principle strain*** values are obtainable by simply solving equations simultaneously. The PhotoStress Separator Gage is based on this fundamental principle of mechanics.
http://www.vishaypg.com/micro-measurements/photo-stress-plus...
Responses
| 5 | principle strain |
Hoang Bao Lan
|
Responses
15 hrs
Hoang Bao Lan
Vietnam
Vietnam
Works in field
Vietnam
Legal, Finance, Game, Marketing, Medical
Native in: Vietnamese (Variant: Standard-Vietnam) 
Works in: English to Vietnamese, Vietnamese to English
principle strain
The mechanics of computing principal strains is identical to that for computing principal stresses. The only potential pitfall to keep in mind is that the equations always operate on one-half of the shear values, γ/2.
The principal stresses are the corresponding normal stresses at an angle, θP, at which the shear stress, τ′xy, is zero.
Hope it helps!
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Note added at 15 hrs (2017-03-24 12:27:37 GMT)
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Maximum and minimum normal strain possible for a specific point on a structural element. Shear strain is 0 at the orientation where principal strain occurs.
The principal stresses are the corresponding normal stresses at an angle, θP, at which the shear stress, τ′xy, is zero.
Hope it helps!
--------------------------------------------------
Note added at 15 hrs (2017-03-24 12:27:37 GMT)
--------------------------------------------------
Maximum and minimum normal strain possible for a specific point on a structural element. Shear strain is 0 at the orientation where principal strain occurs.
Discussion
principal stresses are the maximum and minimum (extremum) extensional (norma) stresses
in a stress state at a point. The principal directions are the corresponding directions. The
principal directions have no shear stresses associated with them
https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-...
Some dishonest politicians might indeed be suffering from 'principle strain' — but clearly that's a LONG way from your context here ;-)
Will point it out to my customer together with other issues... Thanks! Delivery is in the morning and I could not find out now...
'principal strain' is certainly a well-known, valid term... and scores around 115,000 Ghits; with your spelling, the number of Ghits plummets to 10% of that — and all the examples I looked at on the first page (including your own text!) definitely also seemed like errors, from the contexts they appeared in.