摘要
本文把陶瓷—金属界面看做是在陶瓷基体中包含的圆柱形金属夹杂，在夹杂半径趋近无穷大时的极限情形．采用位错连续分布理论，给出了平面应变条件下圆形夹杂两侧的半裂纹的位错密度函数及应力强度因子的解析表达式．让圆形夹杂的半径趋向无穷大，便可得到陶瓷—金属界面的垂直微裂纹的有关结果．根据所得结果，分析了陶瓷和金属材料的弹性模量及热膨胀系数的差异对于其焊接界面微开裂的影响．所得结论对于陶瓷—金属的焊接工艺有指导意义．
In this paper,the metal/ceramic interface is considered to be the limiting case of a cylindrical inclusion boundary, as the inclusion radius approaches to infinity. By using the method of continous dislocation distributions and under the conditions of plane strain,analytical espressions for the stress intensity factors of the half--cracks along the two sides of the circular inclusion are given. Let the radius of the circular inclusion approach to infinite, we obtain the concerning results of the micro -- cracks on metal/ceramic interface. From these results, the effect of the difference between the elastic constants and the thermal espansion coefficients, of metals and ceramics on the microcracking of the joining interface was analyzed. The conclusions of this paper will be helpful for the metal/ceramic joining technology.
出处
《青岛大学学报（自然科学版）》
CAS
1994年第1期1-9,共9页
Journal of Qingdao University(Natural Science Edition)
关键词
陶瓷复合材料
金属
界面
裂纹
metal/ceramic interface
half -- crack
vertical micro -- crack
stress intensity factor
difference of elastic constants
difference of thermal expansioncoefficients
