Hello everyone,
I am studying fracture of polymer composites.
I had a question I want to relate fracture toughness of composite to the composite stress-strain curve found from simple tensin test(on samples with no notch or pre-existing crack), can anyone give me a hint , how to do it?
I noticed in some of my samples (neat epoxy and UD glass epoxy),if the value of strain energy density(KJ/m3) is multiplied by the crack length found from the following relation, the result is close to the value of strain energy release rate (KJ/m^2) found from fracture tes (using CTS sample).
if a=KIc^2/((sut/2)*pi))  & SED=area under stress-strain curve
where sut is failure stress of the material
then SED*a=GIc (approximately equal)

Dear all,

I would like to run a tensile test under ls-dyna of a mild steel  and
apply a 7000 N load to the dog bone specimen on a explicite scheme.

Unfortunately, I
have wild deformations ( and an error) on the nodes on edges where the
load is applied, so can you please tell me what are the importants
constants (like time termination, mass scale,...) and how to perform a
perfect run?

Have a good day,

Thank you

M.

‚Source truncation and exhaustion: Insights from quantitative in-situ
TEM tensile testing' by D. Kiener and A.M. Minor (http://dx.doi.org/10.1021/nl201890s).

The scientific community was challenged by explaining the uncommon
mechanical properties of microscopic samples, leading to the emergence
of two major schools of thought. One group argued that in miniaturized
samples accordingly small dislocations (the carrier of plastic
deformation) will lead to the extraordinarily strength, while the other
envisioned that only pristine volumes could exhibit such high strength.

‚Source truncation and
exhaustion: Insights from quantitative in-situ TEM tensile testing’ by D.
Kiener and A.M. Minor (http://dx.doi.org/10.1021/nl201890s)

I am simulating the tensile test of steel specimen to confirm that
resulting force displacement data matches with experiment. Since the
true stress true strain formulas are not valid beyond necking i have to
rely on actual neck measurements of flat sheet geometry. I have
identified swifts parameter also to use in the material model but some
how i am unable to match my results beyond necking. Any suggestions??

Hello

I am working on a thesis project dealing with flow stress in cold rolling, a plane strain operation. To determine the flow stress, tensile tests were carried out. I am aware, that the engineering strain/stress hast to be transfered to the true strain/stress and then the true strain/stress from the tensile test has to be mulitplied with the Von Mises yield criterion to yield the correspondent compressive flow stress in the rolling situation.

But i dont know which strain from the rolling reduction I have to input into the flow curve which is determined by the tensile test.

Hi all,

I want to FEA of normal tensile creep test using Abaqus. Can anyone suggest me some notes/books/literature.

Thanks

Anil