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

特别考虑非弹性界面不稳定性的复合结构材料断裂强度的力学研究

• 批准号: 63460078
• 负责人: KITAGAWA Hiroshi
• 金额: $ 4.54万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460078/
• 关键词: Laminated Thin Plate; Inelastic Instability; Interfacial Instability; Propagation of Delamination; Deformation Limit; Localized Necking; Elasto; Visco-Plastic Material; Interfacial Roughness; フラクタル次元; 積層複合材; 界面強度; 局所くびれ; 粘; 弾塑性体

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

获得材料的估计原理的目的是通过非弹性界面不稳定性。在张力下的层压结构，以下事实被揭露：双曲线肯定是确定的，在后者的剪切频段型局部拉力下会出现在电子区域中。 S.铝为表面的有价值的材料提供了极大的信息。观察到最终的断裂，聚合物层压板似乎抑制了界面的不稳定性，从而导致最终变形状态。3）界面能量由两个几何结构组成。其他I晶体在显微镜水平上的局部船体（不平衡）随着施加的菌株而增加，每个分数尺寸均为整洁的处方。4）pagation。材料少

项目成果

北川 ほか3名: "積層材の界面はく離伝ぱと母材分岐粒動の協同現象" 日本機械学会関西支部講演会論文集.

北川等3人：《层压材料中界面分层传播与母材分支晶粒运动的协同现象》日本机械工程学会关西分会会议论文集。

渋谷,北川,赤木 坂口: "樹脂積層材の界面はく離伝ぱと母材局所変形挙動" 日本機械学会論文集 A編. 56. 201-206 (1990)

Shibuya、Kitakawa 和 Akagi Sakaguchi：“树脂层压板的界面分层传播和基材局部变形行为”，日本机械工程师学会汇刊，A 版 56. 201-206 (1990)。

北川浩 他: 日本機械学会関西支部学術講演会論文集.

Hiroshi Kitakawa 等：日本机械工程学会关西分会学术会议论文集。

Y. Shibutani, H. Kitagawa & H. Mukai: "Local Deformation Behavior of an Aluminum Foil Laminated with Plastic Films" J. JSTP. Vol. 32, No. 360. 88-93 (1991)

Y.涉谷、H.北川

Y.Shibutani,H.Kitagawa & T.Nakamura: "Growth of Interfacial Inhomogeneous Deformation in Thin Laminated Material Subjected to Bioniod Pension" Proc.Mecamat'91.

涉谷勇、北川浩