Constitutive Modeling of Rate-Dependent Stress–Strain Behavior of Human Liver in Blunt Impact Loading

2008 ◽  
Vol 36 (11) ◽  
pp. 1883-1892 ◽  
Author(s):  
Jessica L. Sparks ◽  
Rebecca B. Dupaix
Keyword(s):  
Impact Loading ◽  
Constitutive Modeling ◽  
Human Liver ◽  
Stress Strain ◽  
Strain Behavior ◽  
Rate Dependent ◽  
Blunt Impact

Nonlinear Rate-Dependent Stress-Strain Behavior of Light-Weight Textile Conveyor Belt

2011 ◽  
Vol 675-677 ◽  
pp. 453-456
Author(s):  
Ze Xing Wang ◽  
Jin Hua Jiang ◽  
Nan Liang Chen
Keyword(s):  
Loading Rate ◽  
Testing Machine ◽  
Rate Sensitivity ◽  
Sensitivity Coefficient ◽  
Conveyor Belt ◽  
Uniaxial Tensile ◽  
Stress Strain ◽  
Strain Behavior ◽  
Rate Dependent ◽  
Dependent Behavior

In order to investigate the effect of loading rate on the tensile performance, the uniaxial tensile experiments were conducted on universal testing machine under different loading rates (5 mm/min, 10mm/min, 50 mm/min, 100 mm/min and 150 mm/min), and a constant gage length equal to 200mm, resulting in loading strain rate of 4.17×10-4, 8.33×10-4/s, 4.17×10-3/s, 8.33×10-3/s,1.25×10-2/s, and the tensile stress-strain curves were obtained. The experimental results show that the tensile properties of the conveyor belt exhibit obvious rate-dependent behavior. In this paper, the rate sensitivity coefficient varied with loading rate, was calculated, and the nonlinear rate-dependent behavior was also investigated.

High Strain-Rate Compressive Behavior and Constitutive Modeling of Selected Polymers Using Modified Ramberg-Osgood Equation

2014 ◽  
Vol 566 ◽  
pp. 80-85
Author(s):  
Kenji Nakai ◽  
Takashi Yokoyama
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Compressive Stress ◽  
Constitutive Modeling ◽  
High Strain ◽  
Strain Rates ◽  
Stress Strain ◽  
Strain Behavior ◽  
Least Squares Fit ◽  
Wide Range

The present paper is concerned with constitutive modeling of the compressive stress-strain behavior of selected polymers at strain rates from 10-3 to 103/s using a modified Ramberg-Osgood equation. High strain-rate compressive stress-strain curves up to strains of nearly 0.08 for four different commercially available extruded polymers were determined on the standard split Hopkinson pressure bar (SHPB). The low and intermediate strain-rate compressive stress-strain relations were measured in an Instron testing machine. Six parameters in the modified Ramberg-Osgood equation were determined by fitting to the experimental stress-strain data using a least-squares fit. It was shown that the monotonic compressive stress-strain behavior over a wide range of strain rates can successfully be described by the modified Ramberg-Osgood constitutive model. The limitations of the model were discussed.

Large deformation rate-dependent stress–strain behavior of polyurea and polyurethanes

Polymer ◽  
2006 ◽  
Vol 47 (1) ◽  
pp. 319-329 ◽  
Author(s):  
J. Yi ◽  
M.C. Boyce ◽  
G.F. Lee ◽  
E. Balizer
Keyword(s):  
Large Deformation ◽  
Deformation Rate ◽  
Stress Strain ◽  
Strain Behavior ◽  
Rate Dependent

scholarly journals A Model of Damage for Brittle and Ductile Adhesives in Glued Butt Joints

Technologies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 19
Author(s):  
Maria Letizia Raffa ◽  
Raffaella Rizzoni ◽  
Frédéric Lebon
Keyword(s):  
Adhesive Layer ◽  
Imperfect Interface ◽  
Interface Condition ◽  
Stress Strain ◽  
Butt Joints ◽  
Adhesive Layers ◽  
Strain Behavior ◽  
Rate Dependent ◽  
Torsional Loads ◽  
Relative Errors

The paper presents a new analytical model for thin structural adhesives in glued tube-to-tube butt joints. The aim of this work is to provide an interface condition that allows for a suitable replacement of the adhesive layer in numerical simulations. The proposed model is a nonlinear and rate-dependent imperfect interface law that is able to accurately describe brittle and ductile stress–strain behaviors of adhesive layers under combined tensile–torsion loads. A first comparison with experimental data that were available in the literature provided promising results in terms of the reproducibility of the stress–strain behavior for pure tensile and torsional loads (the relative errors were less than 6%) and in terms of failure strains for combined tensile–torsion loads (the relative errors were less than 14%). Two main novelties are highlighted: (i) Unlike the classic spring-like interface models, this model accounts for both stress and displacement jumps, so it is suitable for soft and hard adhesive layers; (ii) unlike classic cohesive zone models, which are phenomenological, this model explicitly accounts for material and damage properties of the adhesive layer.

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