Dear lammps users.
Why the value of the stress has negative value?
And why it hasn’t reached a value after the dislocation is gliding?
Here is my shear input
#–setting the output stress (Mpa)
compute Fx A reduce sum fx
variable xlength equal “lx”
variable ylength equal “ly”
variable area equal “v_xlength*v_ylength”
variable Fshear equal “(c_Fx/v_area)*160217.66208”
variable strain equal “c_Adsp/lx”
variable sigma equal “-v_Fshear”
#–bottom (A) rigid ; upper (B) displace
velocity A set 0 0 0
velocity B set 0 0 0
fix 1 B setforce 0 0 0
fix 2 mobile nvt temp 300 300 0.01
fix 3 A move linear 0.012 0 0 units box
velocity mobile ramp vx 0 0.012 z -60 60 sum yes units box
The attachment is the curve.
Best Regards,
Zheng
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