An Analysis of Dynamic Tensile Fracture in Concrete Under High Strain Rate

2009 ◽  
Author(s):  
M. Kurumatani ◽  
S. Iwata ◽  
K. Terada ◽  
S. Okazawa ◽  
K. Kashiyama
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Tensile Fracture

High-speed tensile fractures in granite and gneiss: an experimental study

2021 ◽  
Author(s):  
Beno J Jacob ◽  
Santanu Misra ◽  
Venkitanarayanan Parameswaran ◽  
Nibir Mandal
Keyword(s):  
Aspect Ratio ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Speed ◽  
High Strain ◽  
Tensile Fracture ◽  
High Speed Photography ◽  
Fracture Networks ◽  
Compression Direction ◽  
Tensile Fractures

<p>Tensile fractures are ubiquitous in impact structures formed because of high strain rate deformations of the earth’s crust. At regions far from the point of meteorite impact, intense rupturing, fragmentation, and pulverisation are an implication of pressure waves limiting at the tensile strength of the host rock with little influence of shock deformation or shear failure. The branching and anastomosing of the fractures are controlled by the local stress state and anisotropy. Thus, a network of infilled fractures or impact breccia dikes is a common feature in the subsurface of impact sites.</p><p>We have investigated the failure processes under high strain rates responsible for the formation of Mode-I breccia dikes, at the laboratory scale. The control of planar fabric structures in the development of anastomosing tensile fracture networks was studied through high-strain-rate Brazilian disc tests on gneiss (foliated) and granite (isotropic) samples. A Split Hopkinson Pressure Bar, equipped with high-speed photography (~10<sup>5</sup> fps), was employed in the study. The gneissic foliation in the gneiss samples were oriented at θ = 0, 45 and 90° to the compression direction. The strength of granite lies between 24 and 26 MPa, and the gneisses failed in the range of 29-37MPa at about 70-90 μs. The fracture network formation was seen in the time series images. There is a stark disparity in the nature of failure of granite from gneiss and the geometry of clasts formed in each rock type. While granite samples fail with pulverised clasts localised along a single fracture spanning the diameter of the sample along the compression direction, the gneisses further developed a network of secondary fractures forming large elongate clasts. Preferential orientation of secondary crack growth in relation to the foliation is strongly influenced by <em>θ</em> in gneiss samples. The aspect ratio of the pulverised clasts (size < 10mm) formed in granite was about 1:2, whereas the gneisses produced larger clasts. The clasts in gneisses had an aspect ratio of 1:4 for <em>θ</em> = 45 and 90º, and 1:5 for <em>θ</em> = 0º.</p><p>The branching and anastomosing nature of fractures is similar in fracture networks observed from the field and in the experiments, thus providing an insight into the formation of high-speed impact breccia dikes in isotropic and foliated rocks. Our experiments demonstrate that monomict breccia dikes may by formed <em>in situ</em> inclusive of clasts, rather than by infilling in previously formed tensile fractures.</p>

HIGH STRAIN RATE LOADING OF ZIRCALOY

1985 ◽  
Vol 46 (C5) ◽  
pp. C5-511-C5-516
Author(s):  
A. Kobayashi ◽  
S. Hashimoto ◽  
Li-lih Wang ◽  
M. Toba
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Strain Rate Loading

BALLISTIC PERFORATION OF POLYCARBONATE SHEET AND ITS HIGH STRAIN RATE RESPONSE

1988 ◽  
Vol 49 (C3) ◽  
pp. C3-145-C3-149 ◽  
Author(s):  
N. A. FLECK ◽  
S. C. WRIGHT ◽  
J. H. LIU ◽  
W. J. STRONGE
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain

Challenges Towards Developing a High Fidelity Database for Validating High Strain Rate Composite Material Models

2021 ◽  
Author(s):  
Mark Pankow ◽  
Joseph Giliberto ◽  
Brandon Hearley ◽  
Brian Justusson ◽  
Joseph Schaefer ◽  
...  
Keyword(s):  
Composite Material ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
High Fidelity ◽  
Material Models

Energy Absorption at High Strain Rate of Magnesium Alloy AZ31B

2020 ◽  
Vol 12 (05) ◽  
Author(s):  
M. M. Mubasyir ◽  
◽  
M. F. Abdullah ◽  
K. Z. Ku Ahmad ◽  
R. N. R. Othman ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Energy Absorption ◽  
High Strain ◽  
Magnesium Alloy Az31b
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