Copper material modelling using Johnson Cook model in LS DYNA
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Hello,
Johnson Cook Plasticity Model
Vuhard
hello
i am using modified JC model for the simulation of segmented chip formation in machining of Ti64 alloy and i wrote a VUHARD subroutine for that,but two problem arises,
1.the simulation stops at higher value of frictional co-efficient and
2.the feed force is under predicted
since i didn't use dyieldDeqps,is it necessary?
plz help!
thanx a ton in advance!!
Plotting the Johnson-Cook strength model
I'm trying to plot the stress-strain curve described by the Johnson-Cook strength (and eventually damage) models. The strength model is defined as:
σ=[A+Bεn][1+C ln(ε_dot*)][1-T*m]
where A, B, C, n, and m are material constants, ε_dot* is the non-dimensionalized strain rate, and T* is the homologous temperature where T*=(T-T0)/(Tmelt-T0)
Naming of an "Epsilon Dot Zero" And a "Reference Strain Rate" of J-C Parameters in Abaqus/Explicit
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Hello,
I'm a little bit confused with a naming convention of strain rates of Johnson-Cook plasticity and damage model in Abaqus. In J-C equations there are two parameters:
Johnson-Cook Material Model, Abaqus Explicit
I am currently running a Quasi-Static compression simulation in Abaqus Explicit using the Johnson-Cook Plasticity option. As the strain gets beyond the elastic range, the stress-strain response begins to oscillate +- 5 MPa around the expected curve. Does anyone know why this is happening and/or how to repair the problem?
Thanks,
D. Barrett Hardin
Johnson Cook Mathematical model
Dear friends,
Can anybody give me information/Website/papers/... on below mentioned topic ??
on Johnson Cook plasticity model with analytical forms of the hardening law and rate dependence. I am trying to use this in my high-strain-rate transient dynamic simulations (metals). I am using ABAQUS as analysis tool.
Thanks a ton in advance !
-Balappa Bhairnatti.
Tooltech Deutschland
Munich.