Cho Yi Je, Lee Wookjin, Park Yong Ho
Department of Materials Science and Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Busan 46241, Korea.
Korea Institute of Industrial Technology (KITECH), Namyangsan 1-gil 14, Yangsan 50635, Korea.
Materials (Basel). 2017 Oct 19;10(10):1201. doi: 10.3390/ma10101201.
The elastoplastic deformation behaviors of hollow glass microspheres/iron syntactic foam under tension were modeled using a representative volume element (RVE) approach. The three-dimensional microstructures of the iron syntactic foam with 5 wt % glass microspheres were reconstructed using the random sequential adsorption algorithm. The constitutive behavior of the elastoplasticity in the iron matrix and the elastic-brittle failure for the glass microsphere were simulated in the models. An appropriate RVE size was statistically determined by evaluating elastic modulus, Poisson's ratio, and yield strength in terms of model sizes and boundary conditions. The model was validated by the agreement with experimental findings. The tensile deformation mechanism of the syntactic foam considering the fracture of the microspheres was then investigated. In addition, the feasibility of introducing the interfacial deboning behavior to the proposed model was briefly investigated to improve the accuracy in depicting fracture behaviors of the syntactic foam. It is thought that the modeling techniques and the model itself have major potential for applications not only in the study of hollow glass microspheres/iron syntactic foams, but also for the design of composites with a high modulus matrix and high strength reinforcement.
采用代表性体积单元（RVE）方法对空心玻璃微球/铁复合泡沫材料在拉伸作用下的弹塑性变形行为进行了建模。利用随机顺序吸附算法重建了含有5 wt%玻璃微球的铁复合泡沫材料的三维微观结构。在模型中模拟了铁基体中弹塑性的本构行为以及玻璃微球的弹性脆性破坏。通过根据模型尺寸和边界条件评估弹性模量、泊松比和屈服强度，统计确定了合适的RVE尺寸。该模型通过与实验结果的一致性得到了验证。随后研究了考虑微球断裂的复合泡沫材料的拉伸变形机制。此外，还简要研究了在所提出的模型中引入界面脱粘行为以提高描述复合泡沫材料断裂行为准确性的可行性。认为该建模技术和模型本身不仅在空心玻璃微球/铁复合泡沫材料的研究中，而且在高模量基体和高强度增强体复合材料的设计中都具有很大的应用潜力。
