本文摘要(由AI生成):
本文介绍了使用隐式求解方法对一个特定复合材料试样进行有限元分析的过程。该试样具有特定的几何尺寸和材料属性,包括长度、宽度、厚度以及弹性模量、泊松比和剪切模量等。分析中考虑了试样在裂纹扩展过程中的能量控制、时间步长和隐式求解设置。隐式求解设置包括能量控制、时间步长、一般隐式控制、隐式求解、自动隐式控制和隐式稳定化等参数。此外,还提到了将计算结果以二进制格式输出到D3PLOT文件,并设置了控制终止条件。最后,提到了将计算结果与理论预测进行对比,但未给出具体对比结果。整个分析过程旨在提高复合材料试样在裂纹扩展过程中的模拟精度和稳定性。
裂纹尖端的应力云图
内聚界面的损伤演化
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
*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
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