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.

scholarly journals Fracture Initiation in Notched Specimens Subjected to Compression: Strain Rate Effect

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2613
Author(s):  
Elżbieta Bura ◽  
Andrzej Seweryn
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Fracture Process ◽  
Fracture Initiation ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Specimen Thickness ◽  
Strain Rates ◽  
Notched Specimens ◽  
Compression Strain

This paper shows the results of an experimental investigation on fracture in polymethyl methacrylate (PMMA) notched specimens subjected to compression (with unloading) including different strain rates. Three types of notches were used. Flat specimens were weakened by two types of V-notches and U-notches. Additionally, two specimen thicknesses were used (9.7 and 14.5 mm). The load was carried out at the strain rate of 8 × 10−4, 4 × 10−3, and 2 × 10−2 s−1 and the unloading stage was conducted ten times faster, i.e., 8 × 10−3, 4 × 10−2, and 2 × 10−1 s−1, respectively. By using a PHANTOM high-speed camera, fracture initiation moments and locations were indicated. Two types of crack were observed and distinguished as A-type and B-type. The first was formed by the contact stress of the closing notch surfaces, while the latter was formed by the residual stresses during the unloading stage. The type of notch, specimen thickness, and the strain rate have a significant influence on the fracture process. The strain rate has a large impact on the critical load value, which determines the fracture initiation, but does not affect the location and shape of the crack. The strain rate effect usually disappears with increasing specimen thickness.

Strain rate effect on the tensile behaviour of textile-reinforced concrete under static and dynamic loading

2011 ◽  
Vol 528 (3) ◽  
pp. 1727-1734 ◽  
Author(s):  
Flávio de Andrade Silva ◽  
Marko Butler ◽  
Viktor Mechtcherine ◽  
Deju Zhu ◽  
Barzin Mobasher
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Loading ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Tensile Behaviour ◽  
Textile Reinforced Concrete ◽  
Static And Dynamic Loading
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