XFEM simulation of the effects of microstructure on the intergranular fracture in high strength aluminum alloy
XFEM simulation of the effects of microstructure on the intergranular fracture in high strength aluminum alloy
复制标题
XFEM模拟显微组织对高强度铝合金晶间断裂的影响
DOI：
10.1016/j.commatsci.2013.12.008
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发表时间：
2014-03
影响因子：
3.3
通讯作者：
刘文辉
中科院分区：
文献类型：
--
作者：
刘文辉
建立了包含基体、无析出区和晶界的单胞模型，采用扩展有限元法（XFEM）模拟了单轴拉伸条件下晶界裂纹的扩展行为。模拟了PFZ宽度、颗粒形状、颗粒尺寸、屈服应力、PFZ力学性能对沿晶断裂的影响。模拟结果表明，在单向拉伸载荷作用下，裂纹以平面扩展方式扩展，裂纹形状逐渐转变为圆形。PFZ的存在降低了晶界处的应力强度，随着PFZ宽度的增加，材料的破坏应变增大，而无PFZ的材料由于没有晶界处的变形局部化，破坏应变有所提高。由于裂纹以平面扩展的方式扩展，短方向裂纹扩展受长方向裂纹尺寸的影响，裂纹形状对裂纹扩展方向和裂纹扩展速度起着影响作用。基体屈服应力的增加使沿晶破坏应变降低。
A unit cell including the matrix, precipitation free zone (PFZ) and grain boundary was created, and the extended finite element method (XFEM) was used to simulate the growth behaviors of crack at grain boundary under uniaxial tensile load condition. The effects of PFZ width, particle shape, particle size, yield stress, mechanical properties of PFZ on intergranular fracture were simulated. Simulation results show that the crack extends as plane expansion under uniaxial tensile load, and the shape of crack gradually turns to be a circle. The existence of PFZ can reduce the stress intensity at grain boundary, and the failure strain of material is enhancing with the width of PFZ increasing, but the failure strain of the material without PFZ may be improved because there is no deformation localization around grain boundary. Because the crack extends as plane expansion, the crack growth in short direction is affected by the crack size in long direction, and the crack shape plays a role in influencing the crack growth direction and crack growth velocity. The increasing of yield stress in matrix makes the intergranular failure strain drop.
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影响因子：
5.4
作者：
L. E. Oswald
通讯作者：
L. E. Oswald
影响因子：
6
作者：
S. Lynch
通讯作者：
S. Lynch
影响因子：
3.3
作者：
Wen-hui Liu;Hao Huang;Jianguo Tang
通讯作者：
Wen-hui Liu;Hao Huang;Jianguo Tang
DOI：
10.1016/0001-6160(68)90018-7
发表时间：
1968-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
RYUM, N
通讯作者：
RYUM, N
DOI：
10.1007/s11661-998-0246-3
发表时间：
1998-04-01
影响因子：
2.8
作者：
Deshpande, NU;Gokhale, AM;Liu, J
通讯作者：
Liu, J