Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load

Horizontal layered composite rock samples composed of white and black sandstones with large differences in physical and mechanical properties were tested to explore the dynamic characteristics of layered composite rocks under impact load. Using the split Hopkinson pressure bar test system, the dynam...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Wenjie Liu, Ke Yang, Wei Zhen, Xiaolou Chi, Rijie Xu, Xin Lv
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/d28d32394337495a89683c881426ca8f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d28d32394337495a89683c881426ca8f
record_format	dspace
spelling	oai:doaj.org-article:d28d32394337495a89683c881426ca8f2021-11-29T00:55:25ZEnergy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load1875-920310.1155/2021/8775338https://doaj.org/article/d28d32394337495a89683c881426ca8f2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/8775338https://doaj.org/toc/1875-9203Horizontal layered composite rock samples composed of white and black sandstones with large differences in physical and mechanical properties were tested to explore the dynamic characteristics of layered composite rocks under impact load. Using the split Hopkinson pressure bar test system, the dynamic compression tests of two incident states of stress waves, that is, stress waves from white sandstone to black sandstone (W⟶B) and from black sandstone to white sandstone (B⟶W), were designed and carried out under different impact velocities. Combining the ultrahigh-speed photography system and digital photogrammetry for deformation measurement (DPDM), we obtained the stress wave propagation characteristics, failure characteristics, and particle size distribution characteristics of broken rocks of the composite rocks under the two conditions. The experimental results were compared and analyzed, while stresses and strength conditions at the interface of the composite rock samples were theoretically assessed, yielding the following main findings. The energy dissipation pattern of composite rock had an obvious strain rate effect. The reflected energy and fragmentation energy density of composite rock increased approximately as quadratic functions of the incident energy. Affected by the wave impedance matching relationship, the W⟶B and B⟶W samples were significantly different in terms of the stress wave shape, energy dissipation, average particle size, and fractal dimension of the broken rocks at low impact velocities. However, with an increase in the impact velocities, the two gradually shared the same behavior. When composite rock samples deformed and failed, the macrocracks mostly initiated from the white sandstone. When the crack tip stress of the white sandstone at the interface exceeded the strength of the weakened black sandstone, the crack continued to develop through the two-phase rock interface due to the difference in Poisson’s ratios. The damage degrees and failure modes of the two parts of composite rocks were different: black sandstone was prone to tensile splitting with local shear failure, while white sandstone exhibited shear failure with local tensile splitting. The damage degree of white sandstone exceeded that of black sandstone.Wenjie LiuKe YangWei ZhenXiaolou ChiRijie XuXin LvHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Wenjie Liu Ke Yang Wei Zhen Xiaolou Chi Rijie Xu Xin Lv Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
description	Horizontal layered composite rock samples composed of white and black sandstones with large differences in physical and mechanical properties were tested to explore the dynamic characteristics of layered composite rocks under impact load. Using the split Hopkinson pressure bar test system, the dynamic compression tests of two incident states of stress waves, that is, stress waves from white sandstone to black sandstone (W⟶B) and from black sandstone to white sandstone (B⟶W), were designed and carried out under different impact velocities. Combining the ultrahigh-speed photography system and digital photogrammetry for deformation measurement (DPDM), we obtained the stress wave propagation characteristics, failure characteristics, and particle size distribution characteristics of broken rocks of the composite rocks under the two conditions. The experimental results were compared and analyzed, while stresses and strength conditions at the interface of the composite rock samples were theoretically assessed, yielding the following main findings. The energy dissipation pattern of composite rock had an obvious strain rate effect. The reflected energy and fragmentation energy density of composite rock increased approximately as quadratic functions of the incident energy. Affected by the wave impedance matching relationship, the W⟶B and B⟶W samples were significantly different in terms of the stress wave shape, energy dissipation, average particle size, and fractal dimension of the broken rocks at low impact velocities. However, with an increase in the impact velocities, the two gradually shared the same behavior. When composite rock samples deformed and failed, the macrocracks mostly initiated from the white sandstone. When the crack tip stress of the white sandstone at the interface exceeded the strength of the weakened black sandstone, the crack continued to develop through the two-phase rock interface due to the difference in Poisson’s ratios. The damage degrees and failure modes of the two parts of composite rocks were different: black sandstone was prone to tensile splitting with local shear failure, while white sandstone exhibited shear failure with local tensile splitting. The damage degree of white sandstone exceeded that of black sandstone.
format	article
author	Wenjie Liu Ke Yang Wei Zhen Xiaolou Chi Rijie Xu Xin Lv
author_facet	Wenjie Liu Ke Yang Wei Zhen Xiaolou Chi Rijie Xu Xin Lv
author_sort	Wenjie Liu
title	Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
title_short	Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
title_full	Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
title_fullStr	Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
title_full_unstemmed	Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load
title_sort	energy dissipation and failure characteristics of layered composite rocks under impact load
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/d28d32394337495a89683c881426ca8f
work_keys_str_mv	AT wenjieliu energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload AT keyang energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload AT weizhen energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload AT xiaolouchi energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload AT rijiexu energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload AT xinlv energydissipationandfailurecharacteristicsoflayeredcompositerocksunderimpactload
_version_	1718407798672326656

Energy Dissipation and Failure Characteristics of Layered Composite Rocks under Impact Load

Ejemplares similares