以DCB复合材料双悬臂梁实验为研究对象,基于LS-DYNA隐式算法+内聚力单元(MAT138),给出了完整的k文件!
裂纹尖端的应力云图
内聚界面的损伤演化
求解设置:
内聚力单元采用了mat138
复合材料体系和几何特征为:
AS4/PEEK carbon fiber reinforced composite was simulated and compared with available beam
theory solutions. The specimen length, L, is given in Fig. 6 and 20.0 mm wide with two, 2h, 1.55
mm-thick arms, the latter providing a mode mixity of G II /G T = 43% for the FRMM models. The
initial delamination length is a 0 = 35 mm. The material properties of the AS4/PEEK specimen are
as follows: E 11 = 120 GPa, E 22 = E 33 = 11 GPa, ν 12 = ν 13 = 0.32, ν 23 = 0.45, G 12 = G 13 = 5.5 GPa,and G 23 = 3.7 GPa. The properties of the interface are given in Table 3. The average size of thecontinuum and cohesive elements in the direction of crack propagation is 0.5 mm
隐式求解设置:
*CONTROL_ENERGY
$# hgen rwen slnten rylen
2 2 2 2
*CONTROL_TIMESTEP
$# dtinit tssfac isdo tslimt dt2ms lctm erode ms1st
0.0 0.9 0 0.0 0.0 0 0 0
$# dt2msf dt2mslc imscl unused unused rmscl
0.0 0 0 0.0
$
*CONTROL_IMPLICIT_GENERAL
$# imflag dt0 imform nsbs igs cnstn form
1 0.01
*CONTROL_IMPLICIT_SOLUTION
$ nlsolvr ilimit maxref dctol ectol rctol lstol
0 0 0 0.00 0.00 0 0
$ dnorm divflag inistif nlprint
1 0 0 0
$
*CONTROL_IMPLICIT_AUTO
$ iauto iteopt itewin dtmin dtmax
1 50 20 1E-6 0.02
$
*CONTROL_IMPLICIT_STABILIZATION
$ ias scale tstart tend
1 0.00 0 0
$
*DATABASE_BINARY_D3PLOT
0.5000E-02
$
*CONTROL_TERMINATION
$$ ENDTIM ENDCYC DTMIN ENDENG ENDMAS NOSOL
1 0 0.0 0.0 0.0
计算结果和理论的对比:
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