Molecular Orientations and True Stress−Strain Relationship in Isotactic Polypropylene Film†

2003 ◽  
Vol 36 (21) ◽  
pp. 8066-8073 ◽  
Author(s):  
Yihu Song ◽  
Koh-hei Nitta ◽  
Norio Nemoto
Keyword(s):  
Isotactic Polypropylene ◽  
True Stress ◽  
Polypropylene Film ◽  
Stress Strain ◽  
Strain Relationship ◽  
Isotactic Polypropylene Film

Grafting of methyl methylacrylate onto isotactic polypropylene film using supercritical CO 2 as a swelling agent

Polymer ◽  
2002 ◽  
Vol 43 (4) ◽  
pp. 1183-1188 ◽  
Author(s):  
Zhimin Liu ◽  
Liping Song ◽  
Xinhua Dai ◽  
Guanying Yang ◽  
Buxing Han ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Polypropylene Film ◽  
Swelling Agent ◽  
Isotactic Polypropylene Film

Modification of isotactic polypropylene film by grafting of acrylic acid using supercritical CO2 as a swelling agent

2002 ◽  
Vol 12 (12) ◽  
pp. 3565-3569 ◽  
Author(s):  
Zexuan Dong ◽  
Zhimin Liu ◽  
Buxing Han ◽  
Jun He ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Isotactic Polypropylene ◽  
Supercritical Co2 ◽  
Polypropylene Film ◽  
Swelling Agent ◽  
Isotactic Polypropylene Film

Expression of a Generic Full-Range True Stress-True Strain Model for Pipeline Steels Using the Product-Log (Omega) Function

2017 ◽  
Author(s):  
Onyekachi Ndubuaku ◽  
Michael Martens ◽  
J. J. Roger Cheng ◽  
Samer Adeeb
Keyword(s):  
True Strain ◽  
Full Range ◽  
True Stress ◽  
Stress Strain ◽  
Pipeline Steels ◽  
Strain Behavior ◽  
Proposed Model ◽  
Strain Relationship ◽  
Strain Model

Steel pipelines are subjected to a variety of complex, and sometimes difficult to predict, loading schemes during the fabrication, installation and operation phases of their lifecycles. Consequently, the mechanical behavior of steel pipelines is not only influenced by the steel grade but also by the loading history of the pipe segments. Due to the resultant intricacies of the nonlinear load-deformation behavior of pipelines, adequate numerical analysis techniques are usually required for simulation of pipelines under different loading schemes. The validity of such numerical simulations is largely influenced by the accuracy of the true stress-true strain characterization of the pipeline steels. However, existing stress-strain mathematical expressions, developed for the characterization of metallic materials over the full-range of the stress-strain relationship, have been observed to either loose predictive accuracy beyond a limited strain range or, for the more accurate full-range models, are cumbersome due to their requirement of a large number of constituent parameters. This paper presents a relatively accurate and simple true stress-true strain model which is capable of accurately predicting the stress-strain behavior of pipeline steels over the full range of strains. The proposed stress-strain model is characteristically unlike existing stress-strain models as it is essentially defined by a Product-Log function using two proposed parameters, and is capable of capturing a reasonable approximation of the yield plateau in the stress-strain curve. To validate the proposed model, curve-fitting techniques are employed for comparison to experimental data of the stress-strain behavior of different pipeline steel grades (X52 – X100). Excellent agreements are observed between the proposed model and the different pipeline steels over the full-range of the true stress-true strain relationship. Furthermore, the applicability of the proposed model is validated by means of a proposed parametric procedure for predicting the ultimate compressive strength of shell elements.

Light Scattering by Shock‐Cooled Isotactic Polypropylene Film

1965 ◽  
Vol 36 (9) ◽  
pp. 2874-2879 ◽  
Author(s):  
A. E. M. Keijzers ◽  
J. J. Van Aartsen ◽  
W. Prins
Keyword(s):  
Light Scattering ◽  
Isotactic Polypropylene ◽  
Polypropylene Film ◽  
Isotactic Polypropylene Film
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