Tensile mechanical behaviour of quenched and annealed isotactic polypropylene films over a wide range of strain rates

1995 ◽  
Vol 30 (4) ◽  
pp. 860-868 ◽  
Author(s):  
N. Alberola ◽  
M. Fugier ◽  
D. Petit ◽  
B. Fillon
Keyword(s):  
Isotactic Polypropylene ◽  
Mechanical Behaviour ◽  
Strain Rates ◽  
Wide Range ◽  
Polypropylene Films

Mechanical Behavior of Nanocrystalline Palladium at High Strains and High Strain Rates

2008 ◽  
Vol 584-586 ◽  
pp. 203-208 ◽  
Author(s):  
Yulia Ivanisenko ◽  
Hans Jorg Fecht
Keyword(s):  
Grain Size ◽  
Mechanical Behaviour ◽  
Applied Pressure ◽  
Strain Range ◽  
Torsion Test ◽  
Grain Boundary Sliding ◽  
Strain Rates ◽  
Simple Method ◽  
Steady Stage ◽  
Wide Range

We suggest a simple method to study the mechanical behaviour of nanocrystalline (nc) samples in compression-torsion mode. High applied pressure prevents the fracture of sample, and quantitative parameters of sample response during torsion test can be compared with developed microstructure. Here we present and discuss the results of systematic investigation of mechanical behaviour of nc Pd with a mean grain size of 12 nm in a wide range of shear strains (0<γ<200) and at strain rates γ& = 3 10-1 s-1 and 3 10-2 s-1. We show that in the studied shear strain range the notable changes in the microstructure, namely a strain induced grain growth occurs, and that controls the relevant deformation mechanisms. For lower strains when the grain size is still small enough, the plastic flow governs by twinning and probably grain boundary sliding. The flow stresses are lower as compared with the later stages of deformation, when the grain size becomes larger and deformation is controlled exceptionally by dislocation glide. Finally, a steady stage is achieved, when the grain size, dislocation density and flow stress are saturated.

Deep Drawing of Ti6Al4V: Experiments and Modeling over a Wide Range of Strain Rates and Temperatures

2013 ◽  
Vol 554-557 ◽  
pp. 190-194 ◽  
Author(s):  
Benjamin Chartrel ◽  
Elisabeth Massoni
Keyword(s):  
Finite Element ◽  
Mechanical Behaviour ◽  
Tensile Tests ◽  
Numerical Approach ◽  
Alloy Sheet ◽  
Image Correlation ◽  
Strain Rates ◽  
Analysis Model ◽  
Joule Effect ◽  
Wide Range

A combined experimental-numerical approach using digital image correlation (DIC) and finite element simulation in order to get the temperature dependent mechanical behaviour is presented. Results from a series of experiments on a Ti6Al4V titanium alloy sheet are shown. Tensile tests were carried out on specimens along 3 different orientations in order to characterise the material anisotropy. The strain-rates are varied from 10-1 to 10-2 s-1 while observations are made at temperatures from 903 to 1003 K. The samples are heated by Joule effect, which allows to use the image correlation in order to obtain the deformation fields and thus the coefficients of Lankford [1]. Differences in the responses of this alloy are observed in terms of work hardening, strain rate and temperature sensitivities. The Norton-Hoff model and the Hill [2] criterion are used to effectively simulate the observed responses obtained from these experiments. An inverse analysis model using kriging meta-model [3] is applied to determine each parameter of the mechanical behaviour law. The model, with the constants determined from these experiments, is then used to predict the mechanical behaviour of Ti6Al4V. Thus, the model is implemented into the implicit finite element code Forge® to model forming of thin-walled structures. The predictions are found to be very close to the observations.

Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures

2021 ◽  
Vol 152 ◽  
pp. 103650
Author(s):  
Chencheng Gong ◽  
Yan Chen ◽  
Ting Li ◽  
Zhanli Liu ◽  
Zhuo Zhuang ◽  
...  
Keyword(s):  
Free Volume ◽  
Viscoelastic Model ◽  
Strain Rates ◽  
Nonlinear Viscoelastic ◽  
Wide Range ◽  
Nonlinear Viscoelastic Model
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