Elastic constant setting of hexagonal

solid-solid phase transformations, influence of stresses and strains
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wzb198910
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Joined: Mon Mar 20, 2017 1:29 pm
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Elastic constant setting of hexagonal

Post by wzb198910 » Mon Dec 03, 2018 3:35 pm

Hello everyone,
I want to simulate the alpha-Ti (hexagonal) participating from beta-Ti (cubic) considered the stress.
I get the elastic constant c11, c12, c13, c33 and c55 of alpha-Ti, but only c11, c12 and c44 can be set for alpha-Ti (hexagonal).

The detail settings were shown as follows:
......

# Data for phase 2:
# -----------------
# [identical phase number]
# Simulation of recrystallisation in phase 2?
# Options: recrystall no_recrystall [verbose|no_verbose]
no_recrystall
# Is phase 2 anisotrop?
# Options: isotropic anisotropic faceted antifaceted
anisotropic
# Crystal symmetry of the phase?
# Options: none cubic hexagonal tetragonal orthorhombic
hexagonal
# Should grains of phase 2 be reduced to categories?
# Options: categorize no_categorize
categorize
......
# The database contains 3 phases:
# 1: BCC_A2
# 2: HCP_A3
# 3: LIQUID
# Specify relation between phase indices Micress -> TC!
# The matrix phase has in MICRESS the index 0
# Thermo-Calc index of the (MICRESS) phase 0?
3
# Thermo-Calc index of the (MICRESS) phase 1?
1
# Thermo-Calc index of the (MICRESS) phase 2?
2
# 0 -> LIQUID
# 1 -> BCC_A2
# 2 -> HCP_A3
......
# phase HCP_A3
# --------------------------------------
# Input of molar volumes:
# Options: constant database from_file
constant
# molar volume [cm**3], phase HCP_A3
10.5000000000000
# Thermal expansion coefficients
# along the principal axes xx [1/K], yy [1/K], zz [1/K]? (real) (real) (real)
0 0 0
# Input of elastic constants (c_ij notation):
# Notation for elastic coefficients?
# Options: c_ij Voigt materialParameter
c_ij
# Elastic components (c_ij-notation)
# C11 [MPa] ( >0 ) , phase HCP_A3
# Options: constant from_file
constant
162400.000000000
# C12 [MPa] ( >0, <C11 ), phase HCP_A3
# Options: constant from_file
constant
92000.0000000000
# C44 [MPa] ( >0 ) , phase HCP_A3
# Options: constant from_file
constant
46700.0000000000

Is there anything wrong in my setting?

wzb198910

Bernd
Posts: 1221
Joined: Mon Jun 23, 2008 9:29 pm

Re: Elastic constant setting of hexagonal

Post by Bernd » Mon Dec 03, 2018 5:12 pm

Hi wzb198910,

The current MICRESS version does not allow usage of non-cubic elastic data. We are sorry for that...

Best wishes

Bernd

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