scholarly journals Stress Relaxation Behavior of Polyethylene Films Filled with Glass Fiber Fragments

1973 ◽  
Vol 22 (236) ◽  
pp. 485-488
Author(s):  
Matsuo MAEDA ◽  
Sadao HIBI ◽  
Takashi ODA ◽  
Hajime YAMANAKA
Keyword(s):  
Stress Relaxation ◽  
Glass Fiber ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Polyethylene Films

scholarly journals Interrelation between Fiber–Matrix Interphasial Phenomena and Flexural Stress Relaxation Behavior of a Glass Fiber–Polymer Composite

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 978
Author(s):  
George C. Papanicolaou ◽  
Diana V. Portan ◽  
Lykourgos C. Kontaxis
Keyword(s):  
Stress Relaxation ◽  
Glass Fiber ◽  
Radial Distance ◽  
Relaxation Behavior ◽  
Fiber Reinforced Polymer ◽  
Time Dependent ◽  
Stress Relaxation Behavior ◽  
Reinforced Polymer ◽  
Fiber Matrix ◽  
Fiber Interaction

The response of fiber-reinforced polymer composites to an externally applied mechanical excitation is closely related to the microscopic stress transfer mechanisms taking place in the fiber–matrix interphasial region. In particular, in the case of viscoelastic responses, these mechanisms are time dependent. Defining the interphase thickness as the maximum radial distance from the fiber surface where a specific matrix property is affected by the fiber presence, it is important to study its variation with time. In the present investigation, the stress relaxation behavior of a glass fiber-reinforced polymer (GFRP) under flexural conditions was studied. Next, applying the hybrid viscoelastic interphase model (HVIM), developed by the first author, the interphase modulus and interphase thickness were both evaluated, and their variation with time during the stress relaxation test was plotted. It was found that the interphase modulus decreases with the radial distance, being always higher than the bulk matrix modulus. In addition, the interphase thickness increases with time, showing that during stress relaxation, fiber–matrix debonding takes place. Finally, the effect of fiber interaction on the interphase modulus was found. It is observed that fiber interaction depends on both the fiber–matrix degree of adhesion as well as the fiber volume fraction and the time-dependent interphase modulus.

scholarly journals TEPERATURE DEPENDENCE OF NONLINEAR STRESS RELAXATION BEHAVIOR OF POLYETHYLENE FILMS

1976 ◽  
Vol 32 (10) ◽  
pp. T403-T412 ◽  
Author(s):  
Takuji Yamaguchi ◽  
Teruaki Yanagawa ◽  
Hiroshi Kimura
Keyword(s):  
Stress Relaxation ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Polyethylene Films ◽  
Nonlinear Stress

Effects of accelerator type on stress relaxation behavior and network structure of aged natural rubber/chloroprene rubber vulcanizates

2016 ◽  
Vol 49 (5) ◽  
pp. 381-396 ◽  
Author(s):  
Farzad A Nobari Azar ◽  
Murat Şen
Keyword(s):  
Stress Relaxation ◽  
Natural Rubber ◽  
Network Structure ◽  
Structural Changes ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Rubber Blends ◽  
Chloroprene Rubber ◽  
Weather Changes ◽  
Behavior Network

Natural rubber/chloroprene rubber (NR/CR) blends are among the commonly used rubber blends in industry and continuously are exposed to severe weather changes. To investigate the effects of accelerator type on the network structure and stress relaxation of unaged and aged NR/CE vulcanizates, tetramethyl thiuram disulfide, 2-mercaptobenzothiazole, and diphenyl guanidine accelerators have been chosen to represent fast, moderate, and slow accelerator groups, respectively. Three batches have been prepared with exactly the same components and mixing conditions differing only in accelerator type. Temperatures scanning stress relaxation and pulse nuclear magnetic resonance techniques have been used to reveal the structural changes of differently accelerated rubber blends before and after weathering. Nonoxidative thermal decomposition analyses have been carried out using a thermogravimetric analyzer. Results indicate that there is a strong interdependence between accelerator type and stress relaxation behavior, network structure, cross-linking density, and aging behavior of the blends. Accelerator type also affects decomposition energy of the blends.

scholarly journals Stress-relaxation behavior in gels with ionic and covalent crosslinks

2010 ◽  
Vol 107 (6) ◽  
pp. 063509 ◽  
Author(s):  
Xuanhe Zhao ◽  
Nathaniel Huebsch ◽  
David J. Mooney ◽  
Zhigang Suo
Keyword(s):  
Stress Relaxation ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Covalent Crosslinks
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