Strain-rate effect on the compressive strength of brittle materials and its implementation into material strength model

2019 ◽  
Vol 130 ◽  
pp. 113-123 ◽  
Author(s):  
F. Liu ◽  
Q.M. Li
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Brittle Materials ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Material Strength ◽  
Strength Model

Interaction between Crack and Aggregate in Concrete under Dynamic Tensile Loading and Strain-Rate Effect on Material Strength

2011 ◽  
Vol 243-249 ◽  
pp. 5923-5929
Author(s):  
Lu Guang Liu ◽  
Zhuo Cheng Ou ◽  
Zhuo Ping Duan ◽  
Yan Liu ◽  
Feng Lei Huang
Keyword(s):  
Strain Rate ◽  
Loading Rate ◽  
Interfacial Strength ◽  
Aggregate Size ◽  
Tensile Loading ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Material Strength ◽  
Crack Penetration ◽  
Dynamic Tensile Loading

Crack propagation behaviors at a mortar-aggregate interface in concrete under dynamic tensile loading conditions are investigated numerically. It is found, for a certain interfacial strength and aggregate size, that the crack can penetrate through the interface under an external load with its loading-rate higher than a threshold value. Moreover, for the crack penetration, the smaller the radius of an aggregate, the higher the loading-rate is needed. Therefore, concrete failure energy increase considerably with the loading-rate (or the strain-rate). Such a strain-rate effect on the strength of concrete is in agreement with previous experimental results.

scholarly journals Dynamic Fracture Process and Strain Rate Effect of a Porous SiC Ceramic

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 509 ◽  
Author(s):  
Yanpei Wang ◽  
Ding Zhou ◽  
Huifang Liu ◽  
Sheikh Muhamamd Zakir ◽  
Yulong Li
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Dynamic Loading ◽  
Dynamic Fracture ◽  
High Speed ◽  
Fracture Process ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Sic Ceramic ◽  
Porous Sic

In this paper, dynamic fracture process and strain rate effect of a porous SiC ceramic were investigated. The failure process under dynamic loading conditions was monitored by a high-speed camera. Digital image correlation (DIC) method was further utilized to calculate the surface strain field. The high-speed images show that crack initiates in the center of the specimen and then propagates to the entire specimen under dynamic loading. In addition, DIC result showed that cracks occur on the surface of the specimen formed a band. And the band finally caused the collapse of the specimen. The test results showed that compressive strength of the porous SiC ceramic is rate sensitive. Under quasi-static conditions, the compressive strength is about 120 MPa, while in dynamic conditions strength increased to 247 MPa. Energy absorption during the deformation process is much larger under dynamic loading.

Investigating Strain Rate Effect on Transverse Compressive Strength of Fiber Composites

2006 ◽  
Vol 306-308 ◽  
pp. 733-738 ◽  
Author(s):  
Jia Lin Tsai ◽  
Jui Ching Kuo
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Shear Failure ◽  
Split Hopkinson Pressure Bar ◽  
Rate Sensitivity ◽  
Fiber Composites ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Epoxy Composites ◽  
Hopkinson Pressure Bar

This research aims to investigate strain rate effect on transverse compressive strength of unidirectional fiber composites. Both glass/epoxy and graphite/epoxy composites were taken into account in this study. To demonstrate strain rate effect, composite brick specimens were fabricated and tested to failure in the transverse direction at strain rate ranges from 10-4/s to 500/s. For strain rate less than 1/s, the experiments were conducted by a hydraulic MTS machine. However, the higher strain rate tests were performed using a Split Hopkinson Pressure Bar (SHPB). Experimental observations reveal that the transverse compressive strengths increase corresponding to the increment of the strain rates. A semi-logarithmic function was employed to describe the rate sensitivity of the transverse compressive strength. SEM photographic on the failure surfaces depicts that for glass/epoxy composites, the failure mechanism is mainly due to the matrix shear failure, however, for the graphite/epoxy composites, it becomes the fiber and epoxy interfacial debonding which could dramatically reduce the transverse compressive strengths of the fiber composites.

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