General forms of elastic-plastic matching equations for mode-Ⅲ cracks near crack line

Crack line analysis is an effective way to solve elastic-plastic crack problems.Application of the method does not need the traditional small-scale yielding conditions and can obtain sufficiently accurate solutions near the crack line. To address mode-Ⅲ crack problems under the perfect elastic-plastic condition,matching procedures of the crack line analysis method are summarized and refined to give general forms and formulation steps of plastic field,elastic-plastic boundary,and elastic-plastic matching equations near the crack line. The research unifies mode-Ⅲ crack problems under different conditions into a problem of determining four integral constants with four matching equations.An example is given to verify correctness,conciseness,and generality of the procedure.     

Interaction between a rigid line inclusion and an elastic circular inclusion

I.IntroductionManypracticalproblemsinengineering,suchascompositematerial,weldedjointorribbedslab,needustostudytheinteractionproblemoflineinclusionandcircularinclusionasshowninFig.1.Sotheproblemwasdiscussedinthispaper.Proceedingfromthestressfieldofplanecon…     

应力梯度不均匀时平板表面裂纹的应力强度因子

本文采用考虑裂纹面上具有任意分布载荷的线弹簧模型,在Kirchhoff板弯曲理论的假设下,将含半椭圆型表面裂纹的平板问题化为一组耦合的积分方程组进行求解,对均匀拉伸和纯弯曲两种载荷作用下的应力强度因子数值解,同经典线弹簧模型和有限元解进行了比较,并给出了经典线弹簧模型不能得到的、裂纹面上承受幂次不均匀应力分布时应力强度因子的数值解.     

绘制等应力线的一种有效方法

本文提出了一种绘制受载结构等应力图的有效而简单的方法,这种方法是在开发PRSA-1专用有限元程序中逐渐改进和完善的,它能根据有限元的计算结果连续地在结构内搜索等应力点,也采用了适当的方法构造出一些等应力点。借助于AUTOCAD绘图软件包,结构的等应力图可以在计算机屏幕上自动生成,也可以用绘图仪绘出以便永久保留。     

反平面弹性中的某些刚性线问题

文中分析了反平面弹性中的刚性线问题。通过保角映像,又得出了一系列带刚性半平面边界问题的解。此外,还求出了刚性线端的应力奇异系数。     

Specific features of complete-absorption measurement in selective intracavity laser spectroscopy

For multimode pulsed dye lasers (of nanosecond and microsecond duration with frequency-dependent losses in the cavity), experimental studies and theoretical calculations have been made of the dependence of the value of the equivalent line width, used as a measure of selective absorption, on the main parameters characterizing the laser, the cavity, and the absorbent. Analytical relations have been obtained which describe the main aspects of complete absorption in lines with dispersion, Gaussian, or mixed spectra profiles, and their experimental testing has been carried out. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 327–332, May–June, 2000.     

Generic guiding principle of HTSC material design for high-field application

Through the analyses on the irreversibility lines (ILLs) under H||c for various high-T_c superconducting (HTSC) single-crystalline samples, we found two universal functions representing ILLs. In these functions, the electromagnetic anisotropy factor γ² plays a crucial role. The appropriate chemical substitution, such as Bi(Pb)2212, is an effective method to improve flux pinning properties via decreasing γ².     

Resonance ionization spectroscopy of radioisotopes at the IGISOL facility, JYFL

The method of resonance ionization spectroscopy for measurements of hyperfine structures and isotope shifts of heavy elements, at the IGISOL facility, Jyväskylä, is discussed. Two laser geometries are considered, with reference to the effect they have on resolution and efficiency of measurements. Results of off line resonance ionization tests on natural sodium are reported.     

A finite difference beam propagation algorithm based on generalized transmission line equations

A wide angle beam propagation algorithm is presented, which is based on generalized transmission line (GTL) equations. Besides the discretization, no further approximation is introduced. In principle, a full vectorial analysis is possible, and anisotropic material can be taken into account. The algorithm has been verified for planar 2D-waveguide devices. The wide angle characteristic has been examined by determining the propagation of tilted Gaussian beams in homogeneous media. Further studies were performed for tilted waveguides and for taper structures. Results for the latter devices were compared with other methods showing a very good agreement.