Creep data for Nylon 6

[kevlar49]

Does anyone know where I can get compressive creep data for Nylon 6 (not Nylon 6, 6)? I am looking for data going out to 3 years at least or some way of parametrically (e.g. Larson Miller Parameter) extrapolating/interpolating the creep strain to 3 years.

 

[patprimmer]

I am pretty sure I have some data in an old archive. I know I have plenty for 6.6, but I think also a lesser amount for type 6.

What temperature and load.

I presume Std injection moulding grade with lube and nucleating agents moisture conditioned to equilibrium at 23 deg C at 50% humidity. Degree of crystallinity is an important variable.

Regards
Pat
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[kevlar49]

Hi Pat,

We purchased to ASTM D5989 Type 2 (They call it type 6, but I believe they mean Nylon 6 because they refer to the cast/compression molded version). Room temperature, 7ksi. If you have equivalent for compression molded Nylon 6,6 I could use that too. If properties are better than Nylon 6, I might recommend that instead. Sorry, don't know degree of crystallinity. I'll take what you have at this point.

 

[patprimmer]

The terms nylon type 6 and nylon 6 are used interchangeably.

Degree of crystallinity varies by grade, moulding conditions and colours used. The grade and conditions are noted on test results. I am just saying there is a good chance that your mouldings will perform different to the test specimens.

I only have data for injection mouldings

Regards
Pat
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[kevlar49]

Anyone have isochronous data for nylon 6? I can make use of that.

 

[patprimmer]

I just found some data.

Isochronous stress vs strain for Maranyl Nylon 6 for both controlled crystallinity (nucleated) grade and unmodified grade (basically barefoot resin with minimal mould release lubricant).

Performed over 100 seconds 20 deg C dry specimens.

Horizontal axis is %age strain starting 0.1% strain and finishing 2% strain logarithmic scale.

Vertical axis is stress in psi starting 3 and finishing 10,000

Results are straight lines

First line is unmodified grade starting bottom left at 3.9psi & 0.1% strain & finishing top right 6,000psi & 1.7% strain.

Second line is nucleated grade starting bottom left at 4.2psi & 0.1% strain & finishing top right 6,900psi & 1.7% strain.


Regards
Pat
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[kevlar49]

Thanks Pat, That helps a little.
Anything for at least a thousand hours?

 

[Pud]

If you go here: DSM, click "Material Selector" on right, look down for Akulon K222D (unfilled PA6), click underlined link>properties>Fct on tabs>take your pick of graphs.

Cheers

Harry



www.tynevalleyplastics.co.uk

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[kevlar49]

Pud,

what does the "cond" modifier mean?

 

[patprimmer]

Cond means moisture conditioned according to a specification that should be noted. Probably 50% RH at 23 Deg C as opposed to dry as moulded. It makes a VERY substantial difference. It is also typical of the average real world, but not representative of the extremes in the real world.

Regards
Pat
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