气候变化领域集成服务门户(CCPortal): A Mechanism-Based Model for the Impact Response of Quartz

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DOI	10.1029/2020JB020209
	A Mechanism-Based Model for the Impact Response of Quartz
	Zeng Q.; McCauley J.W.; Ramesh K.T.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The mechanical response of geomaterials to extreme dynamic conditions is essential to understanding planetary impacts, other geological and seismic events, and underground explosions. In this study, we present a multimechanism constitutive model to describe the dynamic response of polycrystalline quartz (e.g., nonporous quartzite), and implement it using a large scale computational analysis to simulate impact events. The active deformation mechanisms within quartz under dynamic loading consist of amorphization, fracture and granular flow. All of these mechanisms are integrated within the model in terms of their competition, evolution, and interaction during a complex loading history. A generalized amorphization model is introduced within a thermodynamically consistent framework on the basis of earlier work in Zeng et al. (2019a, https://doi.org/10.1016/j.jmps.2019.06.012), and accounts for the kinematics of finite deformation inside amorphization bands and the distinct physical properties of the amorphous phase. Fracture in the form of microcracking emanating from internal defects is also considered. Once the material is fully fragmented, the behavior transitions to granular flow. After determining the model parameters for polycrystalline quartz, we illustrate the model response using a representative volume element, where the competition of mechanisms is revealed under several typical loadings. Plate impact experiments and dynamic compression on a polycrystalline quartz foil are then simulated. The simulation results are compared with experiments to prove the predictive capability of the model in capturing the key features of quartz during impact events. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	amorphization; dynamic behavior; mechanism-based model; quartz
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187321
作者单位	Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, MD, United States; Now at Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, China; Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, United States
推荐引用方式 GB/T 7714	Zeng Q.,McCauley J.W.,Ramesh K.T.. A Mechanism-Based Model for the Impact Response of Quartz[J],2021,126(3).
APA	Zeng Q.,McCauley J.W.,&Ramesh K.T..(2021).A Mechanism-Based Model for the Impact Response of Quartz.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Zeng Q.,et al."A Mechanism-Based Model for the Impact Response of Quartz".Journal of Geophysical Research: Solid Earth 126.3(2021).