Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM
For brittle and quasi-brittle materials such as rock and concrete, the impact-resistance characteristics of the corresponding engineering structures are key to successful application under complex service environments. Modeling of concrete-like slab fractures under impact loading is helpful to analy...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/1/207 |
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| author | Qunlei Zhang Decai Wang Jinchao Yue Chun Feng Ruifu Yuan |
| author_facet | Qunlei Zhang Decai Wang Jinchao Yue Chun Feng Ruifu Yuan |
| author_sort | Qunlei Zhang |
| collection | DOAJ |
| description | For brittle and quasi-brittle materials such as rock and concrete, the impact-resistance characteristics of the corresponding engineering structures are key to successful application under complex service environments. Modeling of concrete-like slab fractures under impact loading is helpful to analyze the failure mechanism of an engineering structure. In this paper, simulation models of impact tests of a cement mortar slab were developed, and a continuum–discontinuum element method (CDEM) was used for dynamic analysis. Concretely, the cracking simulations of a mortar slab when considering the hammer shape and impact velocity were conducted, and the impact process and failure results of the slab structure were analyzed. The results showed that the top fracture area of the mortar slab was significantly smaller than that of slab bottom under impact loadings of the drop hammer. The impact velocity was an important factor that affected the mortar slab’s cracking. With the increase in the initial impact velocity, the effective fracture area of the slab structure increased significantly; the impact force and rupture degree of the mortar slab also showed a linear growth trend. The shapes of the impact hammerhead also had a significant effect on the crack model of the mortar slab. The effective fracture zones of slab structures were close under circular and square hammers, while the effective fracture zone was significantly larger under a rectangular hammer impact. The peak value (45.5 KN) of the impact force under a circular hammer was significantly smaller than the peak value (48.7 KN) of the impact force under the rectangular hammer. When considering the influence of the stress concentration of the impact hammerhead, the maximum impact stress of the rectangular hammer was 147.3 MPa, which was significantly greater than that of the circular hammer impact (maximum stress of 87.5 MPa). This may have meant that the slab structures were prone to a directional rupture that mainly propagated along the long axis of the rectangular hammerhead. This impact mode is therefore more suitable for rehabilitation and reconstruction projects of slab structures. |
| first_indexed | 2024-03-11T09:56:12Z |
| format | Article |
| id | doaj.art-a51b44d9d6084b90be5f0ea03063f723 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T09:56:12Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-a51b44d9d6084b90be5f0ea03063f7232023-11-16T15:48:29ZengMDPI AGMaterials1996-19442022-12-0116120710.3390/ma16010207Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEMQunlei Zhang0Decai Wang1Jinchao Yue2Chun Feng3Ruifu Yuan4School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, ChinaInstitute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaFor brittle and quasi-brittle materials such as rock and concrete, the impact-resistance characteristics of the corresponding engineering structures are key to successful application under complex service environments. Modeling of concrete-like slab fractures under impact loading is helpful to analyze the failure mechanism of an engineering structure. In this paper, simulation models of impact tests of a cement mortar slab were developed, and a continuum–discontinuum element method (CDEM) was used for dynamic analysis. Concretely, the cracking simulations of a mortar slab when considering the hammer shape and impact velocity were conducted, and the impact process and failure results of the slab structure were analyzed. The results showed that the top fracture area of the mortar slab was significantly smaller than that of slab bottom under impact loadings of the drop hammer. The impact velocity was an important factor that affected the mortar slab’s cracking. With the increase in the initial impact velocity, the effective fracture area of the slab structure increased significantly; the impact force and rupture degree of the mortar slab also showed a linear growth trend. The shapes of the impact hammerhead also had a significant effect on the crack model of the mortar slab. The effective fracture zones of slab structures were close under circular and square hammers, while the effective fracture zone was significantly larger under a rectangular hammer impact. The peak value (45.5 KN) of the impact force under a circular hammer was significantly smaller than the peak value (48.7 KN) of the impact force under the rectangular hammer. When considering the influence of the stress concentration of the impact hammerhead, the maximum impact stress of the rectangular hammer was 147.3 MPa, which was significantly greater than that of the circular hammer impact (maximum stress of 87.5 MPa). This may have meant that the slab structures were prone to a directional rupture that mainly propagated along the long axis of the rectangular hammerhead. This impact mode is therefore more suitable for rehabilitation and reconstruction projects of slab structures.https://www.mdpi.com/1996-1944/16/1/207cement mortar slabimpact crackingCDEMhammerhead shapeimpact velocity |
| spellingShingle | Qunlei Zhang Decai Wang Jinchao Yue Chun Feng Ruifu Yuan Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM Materials cement mortar slab impact cracking CDEM hammerhead shape impact velocity |
| title | Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM |
| title_full | Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM |
| title_fullStr | Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM |
| title_full_unstemmed | Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM |
| title_short | Investigation of the Fracture Characteristics of a Cement Mortar Slab under Impact Loading Based on the CDEM |
| title_sort | investigation of the fracture characteristics of a cement mortar slab under impact loading based on the cdem |
| topic | cement mortar slab impact cracking CDEM hammerhead shape impact velocity |
| url | https://www.mdpi.com/1996-1944/16/1/207 |
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