many lobed leaf

Based on the fundamental solution of elasticity for two-half elasticity plane,the boundary integral equation method is extended to study the fracture problem in bimaterial plane with multiple cracks subjected to arbitrary loads.

基于双材料平面问题的弹性力学基本解,使用边界积分方程方法,在有限部积分的意义下,将双材料平面单侧多裂纹问题归结为1组以裂纹面位移间断为未知函数的超奇异积分方程组,根据有限部积分原理为其建立了数值算法,并给出了相应的应力强度因子计算公式。

Based on the complex potential method about the plane theory of the elasticity of an anisotropic body,stress distributions in the plate with multiple cracks are obtained by using the conformal mapping and the Faber series expansion.

采用各向异性体平面弹性理论中的复势方法,应用保角映射技术和F aber级数展开,导出在任意载荷作用下多裂纹板应力场的级数解,引入当量屈服应力修正裂尖塑性区,并利用Sw ift韧带屈服准则建立含共线分布多裂纹结构的剩余强度分析模型,计算结果与试验结果吻合较好。

By using of complex variable and integral equation methods, the antiplane multiple elliptical holes and multiple cracks problem of infinite region was considered.

运用复变函数及积分方程方法 ,求解了无限域中的多椭圆孔多裂纹反平面问题 。

Electromyographic activity of the multifidus: When sudden unbalance of patients spine with chronic low back pain;

慢性腰痛患者在脊柱突然失衡时多裂肌的肌电表现

Numerical simulation for fracture propagation of multi-cracked rock materials using virtual multidimensional internal bonds;

基于VMIB多裂纹岩石材料拉伸破坏数值模拟

According to character of procession of concrete material having size effect rule,effective crack propagation of concrete was investigated with size effect rule of fracture toughness of concrete,formula of effective crack propagation was obtained which reflected size effect rule,and then effective crack model of multi-crack concrete was obtained which was relative with dimension of the specimen.

根据混凝土材料断裂过程区存在尺寸效应这一特点,结合混凝土断裂韧度的尺寸效应规律,对混凝土有效裂缝扩展量进行了研究,得到反映尺寸效应规律的有效裂缝扩展量表达式,进而得到与试件尺寸相关的混凝土多裂纹等效断裂模型,使得多裂纹等效断裂模型更符合断裂过程区的尺寸效应规律。

Rock bridge fracture among multi-crack is one of the important reasons for rock mass failure.

多裂纹间的岩桥贯通破坏是导致岩体失稳的重要原因之一。

Now, the safety of multi-cracks damage question is a extreme matter of concerning of the aeronautical engineering, Specially in crack point stress intensity factor solution aspect, Until now it is lack from the an.

在航空工程结构中,存在着众多的多孔连接结构,这些结构承担着重要的传力作用,由于生产、安装、疲劳等原因,造成了这些结构产生裂纹或缺陷,使结构的强度降低,甚至由此结构发生失效,因此多孔多裂纹损伤结构的安全问题是当今航空工程中备受关注且亟待解决的问题,特别是对其断裂特性及裂尖应力强度因子的研究至今从分析方法到数据结果都十分缺乏。

The specificity curve of σe-α, also de- pending on cracks density h, for multi-crack body is given by the analysis of experimenta.

综合实验结果与理论分析，给出了多裂纹体强度特征曲线σｅ－α。

On the foundation of Betti s theorem,the constitutive relation of multi-crack rockmass which considers the effect of crack-closure is developed in this paper.

本文从贝蒂(Betti)定理出发,考虑裂隙在压剪应力作用下的闭合效应,推导出有序多裂隙岩体的本构方程,同时采用数学弹性力学的方法,精确推导出传压系数的理论公式,并对传剪系数加以分析。