Determination of Fracture Toughness JIc Under Quasi-Static and Dynamic Loading Conditions Using Wedge Loaded Specimens

1984 ◽  
Vol 12 (5) ◽  
pp. 316 ◽  
Author(s):  
R Horstman ◽  
KA Peters ◽  
S Gebremedhin ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Dynamic Loading ◽  
Loading Conditions ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading

scholarly journals FDEM Modelling of Rock Fracture Process during Three-Point Bending Test under Quasistatic and Dynamic Loading Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Huaming An ◽  
Yushan Song ◽  
Hongyuan Liu
Keyword(s):  
Fracture Toughness ◽  
Dynamic Loading ◽  
Fracture Process ◽  
Loading Rate ◽  
Rock Fracture ◽  
Mesh Size ◽  
Bending Test ◽  
Loading Conditions ◽  
Three Point Bending ◽  
Dynamic Loading Conditions

A hybrid finite-discrete element method (FDEM) is proposed to model rock fracture initiation and propagation during a three-point bending test under quasistatic and dynamic loading conditions. Three fracture models have been implemented in the FDEM to model the transition from continuum to discontinuum through fracture and fragmentation. The loading rate effect on rock behaviour has been taken into account by the implementation of the relationship between the static and dynamic rock strengths derived from dynamic rock fracture experiments. The Brazilian tensile strength test has been modelled to calibrate the FDEM. The FDEM can well model the stress and fracture propagation and well show the stress distribution along the vertical diameter of the disc during the Brazilian tensile strength test. Then, FDEM is implemented to study the rock fracture process during three-point bending tests under quasistatic and dynamic loading conditions. The FDEM has well modelled the stress and fracture propagation and can obtain reasonable fracture toughness. After that, the effects of the loading rate on the rock strength and rock fracture toughness are discussed, and the mesh size and mesh orientation on the fracture patterns are also discussed. It is concluded that the FDEM can well model the rock fracture process by the implementation of the three fracture models. The FDEM can capture the loading rate effect on rock strength and rock fracture toughness. The FDEM is a valuable tool for studying the rock behaviour on the dynamic loading although the proposed method is sensitive to the mesh size and mesh orientation.

Testing of a tri-instrumented-treadmill unit for kinetic analysis of locomotion tasks in static and dynamic loading conditions

2007 ◽  
Vol 29 (3) ◽  
pp. 404-411 ◽  
Author(s):  
Gabriele Paolini ◽  
Ugo Della Croce ◽  
Patrick O. Riley ◽  
Frederic K. Newton ◽  
D. Casey Kerrigan
Keyword(s):  
Kinetic Analysis ◽  
Dynamic Loading ◽  
Loading Conditions ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading

scholarly journals Determination of the elasticity of parachute materials under dynamic loading conditions

1997 ◽  
Author(s):  
Vance Behr ◽  
Paul Clements ◽  
Mendel Silbert ◽  
Vance Behr ◽  
Paul Clements ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Loading Conditions ◽  
Dynamic Loading Conditions

Changing the Hardness Automotive Steels at Different Strain Rate

2014 ◽  
Vol 635 ◽  
pp. 41-44
Author(s):  
Miroslav Német ◽  
Mária Mihaliková ◽  
Alexandra Kovalčíkova ◽  
Anna Lišková
Keyword(s):  
Strain Rate ◽  
Dynamic Loading ◽  
Automotive Industry ◽  
Interstitial Free ◽  
Loading Conditions ◽  
Product Testing ◽  
Dynamic Conditions ◽  
Interstitial Free Steel ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading

Currently, the automotive industry used sheets of different qualities. The most common include IF (inter Interstitial Free) steel and alloyed steel. Use the sheet quality depends on the point of application in the production car. Testing and product testing is a standard part of the process of innovation and production itself. Testing of automotive steels under dynamic conditions is increasingly important. Changing the hardness HV 1 was performed on the fractured bars on the static and dynamic loading conditions. Tests were made on steel IF and S 460.

Evaluation of Friction at High Strain Rate using the Split Hopkinson Bar

2015 ◽  
Vol 651-653 ◽  
pp. 108-113 ◽  
Author(s):  
Archimede Forcellese ◽  
Edoardo Mancini ◽  
Marco Sasso ◽  
Michela Simoncini
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Strain ◽  
Outer Diameter ◽  
Loading Conditions ◽  
Split Hopkinson ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading ◽  
Frictional Behaviour

The present work aims at studying the influence of strain rate on the frictional behaviour of AA7075 aluminium alloy in the O-annealed temper state. To this purpose, ring compression tests were performed both under quasi-static and dynamic loading conditions. The high strain rate tests were carried out by means of the Split Hopkinson Tension-Compression Bar in the direct version. In both cases, hollow cylindrical samples, characterised by an initial outer diameter to inner diameter to height ratio of 6:3:2, were tested under dry condition and by lubricating with molybdenum disulphide grease. The different frictional behaviour exhibited by AA7075-O under quasi-static and dynamic loading conditions can be attributed to the strain rate effect both on the plastic flow behaviour of the deformed material, and on the thickness of the lubricant film.

Sign in / Sign up

Export Citation Format

Share Document