Interpretation of Material Stress-Strain curves from MMPDS
Interpretation of Material Stress-Strain curves from MMPDS
(OP)
I've been having trouble interpreting material stress-strain curves provided in MMPDS.
I'm posting a curve of 2024-T3 sheet from MMPDS

If the tabular properties from Table 3.2.3.0 (b1) Pg 3-71, ref MMPDS-01 is to be believed, for a bare Al 2024-T3 sheet thickness <0.25", the Ftu is around 65ksi. But in the above figure, the curve for L-Tension plateau's around 52-54 ksi.
Figure 3.2.3.1.6(u) seems like represents a stress-strain curve which matches the tabular Ftu values, but the curve is for clad sheet and I could not find a similar curve for bare in MMPDS.

Would appreciate help in getting a better understanding.
I'm posting a curve of 2024-T3 sheet from MMPDS

If the tabular properties from Table 3.2.3.0 (b1) Pg 3-71, ref MMPDS-01 is to be believed, for a bare Al 2024-T3 sheet thickness <0.25", the Ftu is around 65ksi. But in the above figure, the curve for L-Tension plateau's around 52-54 ksi.
Figure 3.2.3.1.6(u) seems like represents a stress-strain curve which matches the tabular Ftu values, but the curve is for clad sheet and I could not find a similar curve for bare in MMPDS.

Would appreciate help in getting a better understanding.
RE: Interpretation of Material Stress-Strain curves from MMPDS
RE: Interpretation of Material Stress-Strain curves from MMPDS
Brian
www.espcomposites.com
RE: Interpretation of Material Stress-Strain curves from MMPDS
and I don't think thickness explains it ... table properties are very consistent ...
T351 clad gets to 55ksi at about 3" thick,
personally I'd use the clad curve for unclad material (conservative)
another day in paradise, or is paradise one day closer ?
RE: Interpretation of Material Stress-Strain curves from MMPDS
RE: Interpretation of Material Stress-Strain curves from MMPDS
RE: Interpretation of Material Stress-Strain curves from MMPDS
another day in paradise, or is paradise one day closer ?
RE: Interpretation of Material Stress-Strain curves from MMPDS
Somehow I did miss the bottom scale 'Strain' resolution between the two curves.
Is there any reliable & acceptable open source (or proprietary as well) for material mechanical properties information other than MMPDS?
RE: Interpretation of Material Stress-Strain curves from MMPDS
RE: Interpretation of Material Stress-Strain curves from MMPDS
RE: Interpretation of Material Stress-Strain curves from MMPDS
E. Bruhn covered ANC-5 in his text books. Now, I was in Aeronautics at Purdue years ago and Bruhn was head of the Aeronautics school.
Now the guys across the street in Civil and Mechanical engineering schools might have used other sources for material properties.
But, even in ANC-5, etc. the properties are referenced to specific specification (QQ-As, MIL- etc...) at least back in the olden days.
I always found it interesting to trace the origin and history of all this "stuff".
G-pa