Strain Rate Effects on the Crack Propagation Speed Under Different Loading Modes (I, II and I/II): Experimental Investigations

2021 ◽  
pp. 108118
Author(s):  
Mahmoud Alneasan ◽  
Mahmoud Behnia
Keyword(s):  
Crack Propagation ◽  
Strain Rate ◽  
Propagation Speed ◽  
Experimental Investigations ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Crack Propagation Speed ◽  
Loading Modes

Dynamic Property and Fatigue Crack Propagation Research on Tire Sidewall and Model Compounds

1985 ◽  
Vol 58 (4) ◽  
pp. 785-805 ◽  
Author(s):  
D. G. Young
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Strain Rate ◽  
Fatigue Crack Propagation ◽  
Strain Energy ◽  
Laboratory Data ◽  
Sample Thickness ◽  
Strain Level ◽  
Strain Rate Effects ◽  
Rate Effects

Abstract Research was conducted to define appropriate compound loading conditions and energy parameters required to properly control and analyze fatigue crack propagation experiments for tire sidewall applications. The effects of strain level, pulse frequency, overall cycle frequency, sample thickness, and oven temperature were screened, and strain level was shown to be the dominant variable in the region of interest. Designed experiments further confirmed that frequency (i.e., strain rate) effects upon strain energy are small at normal rates of tire deformation (equivalent to 40 Hz). However, at typical laboratory test frequencies (≤5 Hz), strain rate effects on strain energy are large, and the differences vs. results under tire conditions depend heavily on polymer type as well as test temperature. Thus, the use of strain level, strain rate, and temperature conditions which simulate the tire service environment are critical to give representative results in laboratory testing. A constitutive equation was defined which provides an excellent model for strain energy in pure (or simple) shear as a function of the principal extension ratio (i.e., strain level) at constant frequency. Therefore, computer modeling of such experiments appears straightforward using an on-line minicomputer. Fatigue crack propagation studies showed major effects of pure-shear sample thickness, processing prior to molding, different types of reference compounds, and different polymer types. Halobutyl compounds and halobutyl/EPDM/NR blends were shown to provide superior FCP resistance at a given strain or strain energy level. These results were consistent with earlier tire and laboratory data.

scholarly journals Temperature and strain rate effects of jammed granular systems: experiments and modelling

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Piotr Bartkowski ◽  
Grzegorz Suwała ◽  
Robert Zalewski
Keyword(s):  
Finite Element Analysis ◽  
Constitutive Model ◽  
Strain Rate ◽  
Nonlinear Behavior ◽  
Experimental Investigations ◽  
Granular Systems ◽  
Element Analysis ◽  
Strain Rate Effects ◽  
Mechanical Responses ◽  
Rate Effects

AbstractJammed granular systems, also known as vacuum packed particles (VPP), have begun to compete with the well commercialized group of smart structures already widely applied in various fields of industry, mainly in civil and mechanical engineering. However, the engineering applications of VPP are far ahead of the mathematical description of the complex mechanical mechanisms observed in these unconventional structures. As their wider commercialization is hindered by this gap, in the paper the authors consider experimental investigations of granular systems, mainly focusing on the mechanical responses that take place under various temperature and strain rate conditions. To capture the nonlinear behavior of jammed granular systems, a constitutive model constituting an extension of the Johnson–Cook model was developed and is presented. green The extended and modified constitutive model for VPP proposed in the paper could be implemented in the future into a commercial Finite Element Analysis code, making it possible to carry out fast and reliable numerical simulations.

scholarly journals Strain Rate Effects in Dynamic Crack Propagation

1973 ◽  
Vol 21 (230) ◽  
pp. 153-163
Author(s):  
Akira KOBAYASHI ◽  
Tadashi SATO ◽  
Nobuo OHTANI
Keyword(s):  
Crack Propagation ◽  
Strain Rate ◽  
Dynamic Crack Propagation ◽  
Dynamic Crack ◽  
Strain Rate Effects ◽  
Rate Effects
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