A multi-mechanism constitutive model for the dynamic failure of quasi-brittle materials. Part II: Integrative model

Qinglei Zeng, Andrew L. Tonge, K. T. Ramesh*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

15 引用 (Scopus)

摘要

In Part I, we established a model for amorphization during the failure of quasi-brittle materials. In this Part II, we present a multi-mechanism physics-based constitutive model which incorporates amorphization, microcracking and granular flow as basic deformation mechanisms. With this new integrative model, we investigate the interaction and competition of the different mechanisms. In the amorphization model we considered the initiation and evolution of amorphization bands. Microcracking is described with the micromechanics-based damage model developed in Tonge and Ramesh (2016a). Both amorphization and microcracking may introduce damage to the material, and granular flow is activated when the accumulated damage reaches some threshold value. Using boron carbide (BC) as the model material, we examine the response of a representative volume element (RVE) under different loading conditions and loading rates. We apply the full model to full simulations of plate impact and dynamic Vickers indentation into the material. Next, we simulate the sphere-on-cylinder impact experiments as an application of the integrative model. By comparing the simulation results with experiments and studying the influence of the various material parameters, we demonstrate the ability of the integrative model to capture the effects of multiple mechanisms and suggest some promising directions for material-design.

源语言英语
页(从-至)20-42
页数23
期刊Journal of the Mechanics and Physics of Solids
131
DOI
出版状态已出版 - 10月 2019
已对外发布

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引用此

Zeng, Q., Tonge, A. L., & Ramesh, K. T. (2019). A multi-mechanism constitutive model for the dynamic failure of quasi-brittle materials. Part II: Integrative model. Journal of the Mechanics and Physics of Solids, 131, 20-42. https://doi.org/10.1016/j.jmps.2019.06.015