泡沫铝本构行为研究进展
PROGRESS IN CONSTITUTIVE BEHAVIOR OF ALUMINUM FOAM
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摘要: 作为泡沫金属的典型代表, 泡沫铝是一种集结构性和功能性于一体的新型材料, 随着生产工艺的提高及国民经济的发展, 泡沫铝在航空航天、交通运输、建筑工程、机械制造等领域的应用日趋深入和广泛. 工程中复杂的载荷工况, 对泡沫铝本构模型的准确性及实用性提出了更高的要求. 国内外学者对泡沫铝进行了大量的试验研究及有限元数值分析工作, 随着各种研究和数值分析本构模型的提出、验证及修正等, 人们对泡沫铝的力学性能及其应用的认识逐渐提高. 本文首先简要概述了泡沫铝力学性能的试验研究及有限元数值分析的进展, 然后重点综述泡沫铝本构行为的国内外研究进展及现状. 最后, 针对目前存在的问题, 讨论并展望了泡沫铝本构行为的研究发展趋势. 完善本构模型表征所需的特征参量, 将各向异性或横观各项同性材料假定引入模型构建体系, 明确静水压缩响应及单轴压缩响应在材料强化中的权重, 建立例如随动强化般更加真实且准确反映泡沫铝强化过程的强化准则, 将应变率效应研究成果引入本构模型中等是现有泡沫铝本构模型体系中的重要研究方向.Abstract: As a typical representation in various metallic foams, the aluminum foam is a kind of new material that integrates both structural properties and functional properties. With the improvement of production technology and the development of national economy, the application of the aluminum foam is becoming deeper and wider in the fields of aerospace engineering, transportation, construction engineering, machinery manufacturing and so forth. The complex load conditions in engineering application put forward higher requirements for the accuracy and practicability of the aluminum foam constitutive models. A great deal of experimental research and finite element numerical analysis on aluminum foam have been carried out by scholars both at home and abroad. With the proposal, verification and modification of various research constitutive models and numerical constitutive models, the understanding of researchers on the mechanical properties of aluminum foam becomes deeper and deeper. First of all, the development of experimental research and finite element numerical analysis on the mechanical properties of aluminum foam is briefly summarized in this paper; after that, the research progress and the present situation of constitutive model of aluminum foam both at home and abroad are emphatically reviewed; at last, aiming at the existing problems, the development trend of foam aluminum constitutive model is discussed and prospected. The important research directions in the existing aluminum foam constitutive model system are as follows: supplementing the characteristic parameters that are required for the characterization of constitutive model; introducing the anisotropic material assumption or the transversely isotropic material assumptions into the model building system; clarifying the weight of hydrostatic compression response and uniaxial compression response in material hardening; establishing hardening models which can truly and accurately reflect the hardening process of aluminum foam, such as the kinematic hardening model; introducing the research results of strain rate effect into the constitutive model and so forth.