A Mechanical Study on Fracture Sstength of Material with Composite Structure Taking Special Consideration on Inelastic Interfacial Instability

这个项目的目标是获得具有复合结构的材料的碎片强度的估计原则。特别考虑因素涉及到非弹性互Facial不稳定性。主要结果被归纳为：1）通过在张力下形成的平面应变块的分析和数值调查出现在双绞线块中，而后面的事实也会蔓延到光：管理电子成为椭圆或超声波的条件，是明确确定的，在哪个剪切带类型的局部应变下的最后一个可能出现。在椭圆区域，具有各种波长度的界面模式的差异，包括无限波的一个。此双胞胎-cation对应于在接口上出现本地约束，然后我们可以将其作为接口删除的标准使用。对材料特性的依赖程度已在详细情况下研究。（2）实验o ... More 由铝箔和聚合物组成的层状薄板中的表面粗糙度的增长的观察显示了表面和表面不稳定性的真实性的有价值的信息。这个复合材料是已知的，以具有极大的可变形性。这并不是简单的，但生物张力测试是适合的，估计薄材料变形的真实性，因为自由边缘稳定性的影响被排除在外。interfacial roughness increases with接近比例的比率到了早期阶段的应用，以及在roughness held to be nearly constant之后，快速增长到最后的fracture是可见的。在这个平台期间，聚合物层压板似乎可以抑制最后变形状态的界面结构。3）由于界面不可能的能量可以由两个不同的截面尺寸组成两个几何结构。一个人的起源是初始的不健康和谷物大小，另一个人的起源是微观层面上的水晶的本地地位。Although the magnitude of roughness （unevenness） increase with the applied strain， each fractional dimension is held to be nearly constant. 4）Numeric simulation of delamination and its propagation gives details of mutual interaction between the defect of materials and adhesive layer and the materials composed的机械属性。Less（低）

The aim of this project is to acquire the estimation principle for fracture strength of the material with composite structure. Special Consideraion is taken on inelastic interfacial instability. The main results obtained are summarized as follows :1) Through the analytical and numerical investigations of bifurcation appearing in a plane strain block with laminated structure under tension, the following facts are brought to light : Conditions for the governing equation being elliptic or hyperbolic, are definitely determined, under the latter of which shear-band type localized straining is predicted to appear. In the elliptic region, bifurcations of interfacial mode with various wave length exist, including the infinitesimal one. This bifurーcation corresponds to appearance of localized straining on the interface, and then we can use it as the criterion of interfacial delamination. Dependence of the bifurcation condition with the material properties are studied in detail.2) Experimental o … More bservation of growth of interfacial roughness appearing in the laminated thin plate composed by aluminum foil and polymer gives valuable information for the reality of the surface and interfacial instability. This composite material is known to have the extreme deformability. Not the simple, but the biaxial tension test is suitable for estimate the true ability of deformation of the thin material, because the effect of free edge instability is excluded. The interfacial roughness increases with nearly proportional rate to the applied at the early stage, and after the period of the roughness held to be nearly constant, rapid growth to the final fracture is observed. During this plateau period, the polymer laminate seems to suppress the interfacial instability which leads to the ultimate deformation state.3) The interfacial unevenness energy to be composed of two geometrical structures with different fractional dimensions. The origin of the one is the initial unevenness and the grain size and the other is localized ship of the crystal in microscopic level. Although the magnitude of roughness (unevenness) increase with the applied strain, each fractional dimension is held to be nearly constant.4) Numerical simulation of delamination and its propagation gives details of mutual interaction between the defect of materials and adhesive layer and the mechanical properties of the materials composed. Less