4.13.1.3. Steel4ΒΆ
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uniaxialMaterial
('Steel4', matTag, Fy, E0, '-asym', '-kin', b_k, *params, b_kc, R_0c, r_1c, r_2c, '-iso', b_i, rho_i, b_l, R_i, l_yp, b_ic, rho_ic, b_lc, R_ic, '-ult', f_u, R_u, f_uc, R_uc, '-init', sig_init, '-mem', cycNum) This command is used to construct a general uniaxial material with combined kinematic and isotropic hardening and optional non-symmetric behavior.
matTag
(int)integer tag identifying material Fy
(float)yield strength E0
(float)initial elastic tangent '-kin'
(str)apply kinematic hardening b_k
(float)hardening ratio (E_k/E_0) params
(list (float))control the exponential transition from linear elastic to hardening asymptote params=[R_0,r_1,r_2]
. Recommended values:R_0 = 20, r_1 = 0.90, r_2 = 0.15
'-iso'
(str)apply isotropic hardening b_i
(float)initial hardening ratio (E_i/E_0) b_l
(float)saturated hardening ratio (E_is/E_0) rho_i
(float)specifies the position of the intersection point between initial and saturated hardening asymptotes R_i
(float)control the exponential transition from initial to saturated asymptote l_yp
(float)length of the yield plateau in eps_y0 = f_y / E_0 units '-ult'
(str)apply an ultimate strength limit f_u
(float)ultimate strength R_u
(float)control the exponential transition from kinematic hardening to perfectly plastic asymptote '-asym'
(str)assume non-symmetric behavior '-init'
(str)apply initial stress sig_init
(float)initial stress value '-mem'
(str)configure the load history memory cycNum
(float)expected number of half-cycles during the loading process Efficiency of the material can be slightly increased by correctly setting this value. The default value is cycNum = 50
Load history memory can be turned off by settingcycNum = 0
.
See also