I型裂纹虚拟裂纹闭合法的误差分析及修正

对虚拟裂纹闭合法的误差来源进行了分析。依据Griffith的椭圆裂纹近似理论,针对虚拟裂纹闭合法的位移相等假设,提出了一种修正方法。用有限元程序计算了二维I型裂纹的扩展问题,并与理论近似解做了比较。计算结果表明,修正以后可以得到更好的精度,在裂纹长度较短时,修正效果更好。     

Force criterion of different electrolytes in microchannel

The control and handling of fluids is central to many applications of the lab-on-chip. This paper analyzes the basic theory of manipulating different electrolytes and finds the two-dimensional model. Coulomb force and dielectric force belonging to the body force of different electrolytes in the microchannel were analyzed. The force criterion at the interface was concluded, and testified by the specific example. Three basic equations were analyzed and applied to simulate the phenomenon. The force criterion was proved to be correct based on the simulation results.