Strain Rate Effect on Static and Dynamic Behaviors of Eastern Canada Fine Grained Soils

2021 ◽  
Author(s):  
Mustapha Abdellaziz ◽  
Mourad Karray ◽  
Jeudy Betegard ◽  
Pascal Locat ◽  
Catherine Ledoux ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Amplitude ◽  
Simple Shear ◽  
Large Strain ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Experimental Results ◽  
Published Data ◽  
Eastern Canada ◽  
Accurate Analysis

The assessment of the strain rate effect on the geotechnical properties of soils constitutes an important step toward a more accurate analysis of their response. This study presents the experimental results of monotonic and cyclic simple shear tests performed to examine the strain rate effect on the behavior of eastern Canada soils. Eight natural soils sampled from different locations in eastern Canada were used in this study. The tests were performed on a simple shear device using a strain-controlled mode. In addition to the obtained experimental results, published data in the literature were used to draw the conclusions of this study. Analysis of the data indicates that the undrained shear strength increases proportionally with the strain rate by approximately 10–17% per log cycle of . The results also show that the secant shear modulus G increases with the strain rate, especially at large strain amplitude. Moreover, the analysis of the data revealed that the magnitude of the strain rate effect seems to be correlated with the shear strain amplitude and plasticity index (Ip). A practical application of the outcomes on the backbone curves is given in which illustrates the influence of and on the strain rate effect.

Effect of Strain Rate on the Simulation of MEMS Safety and Arming Device

2014 ◽  
Vol 609-610 ◽  
pp. 849-855
Author(s):  
Wen Rui Ma ◽  
Guang He
Keyword(s):  
Finite Element Analysis ◽  
Strain Rate ◽  
Impact Load ◽  
Simulation Models ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Experimental Results ◽  
Analysis Software ◽  
Element Analysis ◽  
Simulation Results

Under launch impact load, LIGA nickel that manufacturing MEMS fuze safety and arming (S&A) device will have obvious strain rate effect. By using finite element analysis software ANSYS/LS-DYNA, simulation models of a small-caliber ammunition MEMS fuze setback S&A device with strain rate effect and without strain rate effect were respectively established. The results of the two simulation modules were quite different. Comparisons between experimental results and simulation results show that simulation results considering strain rate effect agree well with experimental results, which proves strain rate effect should not be ignored in the simulation of MEMS S&A device.

A large strain rate effect in thin free-standing Al films

2014 ◽  
Vol 90-91 ◽  
pp. 6-9 ◽  
Author(s):  
E. Ben-David ◽  
T. Tepper-Faran ◽  
D. Rittel ◽  
D. Shilo
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Free Standing ◽  
Large Strain Rate

scholarly journals Strain-rate effects associated with the HJC concrete model

2018 ◽  
Vol 183 ◽  
pp. 01008 ◽  
Author(s):  
Gordon Johnson ◽  
Timothy Holmquist ◽  
Charles Gerlach
Keyword(s):  
Strain Rate ◽  
High Strain ◽  
Confining Pressure ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Published Data ◽  
Strain Rate Effects ◽  
Third Invariant ◽  
Rate Effects ◽  
Additive Term

The Holmquist-Johnson-Cook (HJC) model for concrete was presented in 1993 and has been used extensively since that time. Since then a third invariant effect has been added and the shear modulus has been revised to vary such that Poisson's ratio is held constant. It has always been diffcult, however, to determine the appropriate constant for the strain-rate effect as most of the published data are for the net stress as a function of the strain rate. Because concrete is both pressure dependent and strain-rate dependent, it is necessary to separate the individual effects. Recently strain-rate data for three concrete materials were presented by Piotrowska and others [1, 2], where the data are presented as equivalent stress versus confining pressure for a high strain rate and a quasi-static strain rate. This is the form necessary to determine the appropriate strain-rate effect, and the data show that the strain-rate effect is larger than used in the initial publication of the HJC model, and also that the strain-rate effect is a function of the confining pressure. For lower pressures the strain-rate effect is a factor to be applied to the quasi-static data (which is the effect represented in the original HJC model), but for higher pressures the strain rate effect is better represented by an additive term. With the addition of an another HJC constant (the pressure at which the strain rate effect transitions from a multiplied factor to an additive term) it is possible to more accurately represent the response of concrete under high pressures and high strain rates, and it is possible to compute more accurate results for projectile penetration into concrete targets. The paper presents the modified form of the HJC model, an analysis of the strain-rate effects, and results of penetration computations that are compared to experimental data in the literature.

Study of the Strain Rate Effect on Cold-Reduced Carbon Steel and Aluminium Alloy with Numerical Simulations

2006 ◽  
Vol 532-533 ◽  
pp. 973-976
Author(s):  
Lin Wang ◽  
Tai Chiu Lee ◽  
Luen Chow Chan
Keyword(s):  
Carbon Steel ◽  
Strain Rate ◽  
Strain Path ◽  
Plastic Material ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Forming Process ◽  
Risk Area ◽  
Sensitive Material ◽  
Simulation Results

In this paper, the effect of strain rate has been considered in the simulation of forming process with a simple form combined into the material law. Quite a few researchers have proposed various hardening laws and strain rate functions to describe the material tensile curve. In this study, the strain rate model Cowper-Symonds is used with anisotropic elasto-plastic material law in the simulation process. The strain path evolution of certain elements, when the strain rate is considered and not, is compared. Two sheet materials, Cold-reduced Carbon Steel (SPCC) JIS G3141 and Aluminum alloy 6112 are used in this study. Two yield criteria, Hill 48 and Hill 90, are applied respectively to improve the accuracy of simulation result. They show different performance when strain rate effect is considered. Strain path of the elements in the fracture risk area of SPCC (JIS G3141) varies much when the strain rate material law is used. There is only little difference of the strain distribution of Al 6112 when the strain rate effect is included and excluded in the material law. The simulation results of material SPCC under two conditions indicate that the strain rate should be considered if the material is the rate-sensitive material, which provides more accurate simulation results.

Sign in / Sign up

Export Citation Format

Share Document