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

本课题的目的是获得复合结构材料断裂强度的估算原理。特别考虑了非弹性界面失稳。1）通过对平面应变层合结构块体在拉伸作用下出现分叉的解析和数值研究，明确了控制方程为椭圆型或双曲型的条件，并预测了在双曲型条件下出现剪切带型局部应变。在椭圆区域，界面模在不同波长下都存在分叉，包括无穷小分叉。这种分叉对应于界面局部应变的出现，可以作为界面分层的判据。详细研究了分叉条件与材料性质的关系。2）实验结果表明， ...更多信息 对铝箔-聚合物复合薄板中界面粗糙度增长的研究，为表面真实性和界面不稳定性提供了有价值的信息。已知这种复合材料具有极强的变形能力。双轴拉伸试验并不简单，但由于排除了自由边失稳的影响，适合于估算薄材料的真实变形能力。界面粗糙度的增加几乎成比例的速率，在早期阶段的应用，并在一段时间的粗糙度保持几乎恒定，观察到快速增长到最终的断裂。在此平台期内，层合板抑制了界面的不稳定性，从而导致最终的变形状态。3）界面不均匀能由两种不同分形维数的几何结构组成。其原因一是初始不均匀性和晶粒尺寸，二是微观上晶体的局域化。虽然粗糙度（不均匀度）的大小随着施加的应变而增加，但每个分数维几乎保持不变。4）分层及其扩展的数值模拟给出了材料缺陷和粘合层之间的相互作用以及组成材料的机械性能的细节。少

项目成果

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 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。

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

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

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。