Dynamic Response of Rock Containing Regular Sawteeth Joints under Various Loading Rates and Angles of Application
| Autor: | Tzuu-Hsing Ueng, Chen-Yu Lin, Hung-Hui Li, Pei-Yun Shu, Tai-Tien Wang, Ta-Wui Cheng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
musculoskeletal diseases
Failure type Materials science 0211 other engineering and technologies 02 engineering and technology loading rate lcsh:Technology lcsh:Chemistry Stress (mechanics) 0203 mechanical engineering dynamic peak stress General Materials Science failure type Composite material lcsh:QH301-705.5 Instrumentation Joint (geology) 021101 geological & geomatics engineering Stress concentration Fluid Flow and Transfer Processes lcsh:T regular rock joints Process Chemistry and Technology General Engineering Split-Hopkinson pressure bar angle of load lcsh:QC1-999 Computer Science Applications Rate of increase 020303 mechanical engineering & transports lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Loading rate lcsh:Engineering (General). Civil engineering (General) lcsh:Physics Asperity (materials science) |
| Zdroj: | Applied Sciences Volume 10 Issue 15 Applied Sciences, Vol 10, Iss 5204, p 5204 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10155204 |
| Popis: | Intact rock-like specimens and specimens that include a single planar joint or triangular sawteeth joint at various angles are prepared for split Hopkinson pressure bar (SHPB) testing at loading rates of 303.1&ndash 5233.6 GPa/s. Only results that are associated with an error (e&epsilon ) of less than 20.0% are utilized in subsequent analyses. The effects of the loading rate and angle of the load applied to various joint patterns on the failure type and dynamic peak stresses/strength of the specimens are investigated. Experimental results demonstrate that failure of each specimen can be classified into the following four types, Type A: integrated with or without tiny flake-off, Type B: slide failure, Type C: fracture failure, and Type D: crushing failure. The results of statistical analysis of variance (ANOVA) indicate that the loading rate, the angles of the base plane (&beta ), and the asperity (&alpha ) of the sawteeth joint of the specimen all affect its dynamic peak stress when fracture failure occurs. The loading rate and &beta are important when the slide failure occurs, and the loading rate is the sole factor that significantly influences its dynamic peak stress when the specimen is crushed to failure. The dynamic peak stress of the specimen increases with the loading rate, while the rate of increase gradually decreases. The &beta and &alpha of a jointed specimen affect the location of stress concentration during loading, further influencing the dynamic peak stress of such a specimen under slide and fracture failure. When the loading rate is high and the specimen is crushed to failure, the influences of &beta disappear, and the increase of loading rate reduces the efficiency of raising the dynamic peak stress. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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