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Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
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Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity
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Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity


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  Post Number #1  
Old 9th June 2011, 04:59 AM
Msteiger

 
 
Total Posts: 1
Question Error in ASTM D3039 - 13.3.1 - Tensile Chord Modulus of Elasticity

Just checking that I am not going crazy.

ASTM D3039 states in 13.3.1. Tensile Chord Modulus of Elasticity:

Echord = Ds/De (9)

where:
Echord = tensile chord modulus of elasticity, GPa [psi];
Ds = difference in applied tensile stress between the two strain points of Table 3, MPa [psi]; and
De = difference between the two strain points of Table 3 (nominally 0.002).

The way I figure, if you put in Ds as MPa, then the result for Echord will be in MPa also, and not GPa as stated. Just like when Ds is put in as psi, the result will be in psi.

Right?

Maybe calling this an error is going a bit far, but it's confusing at best.

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  Post Number #2  
Old 14th June 2011, 07:03 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,244
Re: Error in ASTM D3039? 13.3.1. Tensile Chord Modulus of Elasticity

Quote:
In Reply to Parent Post by Msteiger View Post

Just checking that I am not going crazy.

ASTM D3039 states in 13.3.1. Tensile Chord Modulus of Elasticity:

Echord = Ds/De (9)

where:
Echord = tensile chord modulus of elasticity, GPa [psi];
Ds = difference in applied tensile stress between the two strain points of Table 3, MPa [psi]; and
De = difference between the two strain points of Table 3 (nominally 0.002).

The way I figure, if you put in Ds as MPa, then the result for Echord will be in MPa also, and not GPa as stated. Just like when Ds is put in as psi, the result will be in psi.

Right?

Maybe calling this an error is going a bit far, but it's confusing at best.
Can someone help with this?

Thanks!!

Stijloor.
  Post Number #3  
Old 14th June 2011, 11:25 AM
BadgerMan's Avatar
BadgerMan

 
 
Total Posts: 698
Re: Error in ASTM D3039? 13.3.1. Tensile Chord Modulus of Elasticity

Wow, this is so far outside my scope of experience.

Help. Bump.
  Post Number #4  
Old 30th January 2017, 05:24 PM
krayworth

 
 
Total Posts: 14
Question Re: Error in ASTM D3039? 13.3.1. Tensile Chord Modulus of Elasticity

Stijloor,

Were you able to find an answer? I completely agree with your school of thought and am surprised that ASTM has not still updated the standard...
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