界面性能对层状结构材料力学行为的影响  

Effect of interface property on mechanical behavior of layered materials

作　　者：彭志龙 杨爽 陈少华 PENG Zhilong;YANG Shuang;CHEN Shaohua(Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]北京理工大学先进结构技术研究院,北京100081

出　　处：《山东科技大学学报（自然科学版）》2020年第4期106-112,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(11672302)。

摘　　要：自然界生物材料(贝壳、骨头、龟壳等)大都具有人工材料不可比拟的优异力学性能,主要由于该类生物材料由大量基本组成单元通过桥联界面构筑而成。为了揭示界面性能对整体材料力学行为的影响,建立了相应的有限元模型,数值模拟了不同界面性质对材料强韧机制的作用,主要考虑了界面强度、界面刚度及界面最大分离位移等影响因素。结果表明,界面性能对材料力学行为有重要影响,当基本组成单元材料性质一定时,根据界面性能的不同,整体材料破坏分为界面失效、界面和组成单元混合失效以及组成单元失效三种形式,进一步对影响整体材料强度和韧性的主要因素进行了讨论。研究结果对设计力学性能优异的层状复合材料具有重要的指导作用。Biomaterials(e.g.seashells,bones,turtle shells)in nature have superior mechanical behaviors where the synthetic ones cannot compare with primarily because such biomaterials are constructed by large number of basic constitutive elements through bridging fiber interfaces.In order to investigate the effect of interface on the mechanical behavior of entire material,a finite element model was established.The purpose is to numerically simulate the influence of different interface properties on the strength and toughness of materials,in which the effects of interface strength,interface stiffness and the maximum separation displacement were mainly considered.It is found that the interfaces have important influence on the mechanical behavior of the materials.When the materials’properties of the constitutive elements are given,the fracture modes of the layered materials can be divided into interface failure,mixed failure of interface and the constitutive elements,and direct failure of the elements depending on the interface properties.The influencing factors on the layered materials’strength and toughness were further studied.The results obtained and presented in this paper are helpful for the design of layered composite materials with high strength and toughness.

关 键 词：层状材料 界面性能 内聚力模型 材料强度 材料韧性 力学行为 

分 类 号：TB33[一般工业技术—材料科学与工程]