A Study on Stress Relaxation Behavior of Isotropic Magnetorheological Elastomeric Composite

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.

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Prediction of stress-relaxation behavior in high density polyethylene solids

Macromolecular Theory and Simulations ◽

10.1002/(sici)1521-3919(19990501)8:3<254::aid-mats254>3.0.co;2-e ◽

1999 ◽

Vol 8 (3) ◽

pp. 254-259 ◽

Cited By ~ 16

Author(s):

Koh-hei Nitta ◽

Kazushi Suzuki

Keyword(s):

Stress Relaxation ◽

High Density Polyethylene ◽

High Density ◽

Relaxation Behavior ◽

Stress Relaxation Behavior

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Stress relaxation behavior of eutectic tin-lead solder

Journal of Electronic Materials ◽

10.1007/bf02655466 ◽

1995 ◽

Vol 24 (10) ◽

pp. 1473-1484 ◽

Cited By ~ 19

Author(s):

E. W. Hare ◽

R. G. Stang

Keyword(s):

Stress Relaxation ◽

Relaxation Behavior ◽

Stress Relaxation Behavior

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Stress-relaxation behavior in gels with ionic and covalent crosslinks

Journal of Applied Physics ◽

10.1063/1.3343265 ◽

2010 ◽

Vol 107 (6) ◽

pp. 063509 ◽

Cited By ~ 177

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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Stress relaxation behavior of 3501-6 epoxy resin during cure

Polymer Engineering & Science ◽

10.1002/pen.10686 ◽

1996 ◽

Vol 36 (23) ◽

pp. 2852-2862 ◽

Cited By ~ 105

Author(s):

Yeong K. Kim ◽

Scott R. White

Keyword(s):

Stress Relaxation ◽

Epoxy Resin ◽

Relaxation Behavior ◽

Stress Relaxation Behavior

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Reloading Stress Relaxation Behavior Analysis Based on a Creep Model for High Temperature Bolting Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.328.950 ◽

2013 ◽

Vol 328 ◽

pp. 950-954

Author(s):

Wei Wei Zhang ◽

Hong Xu ◽

Hong Yuan Li

Keyword(s):

High Temperature ◽

Stress Relaxation ◽

Steady State Creep ◽

Relaxation Behavior ◽

Creep Model ◽

National Research Institute ◽

Time Intervals ◽

Stress Relaxation Behavior ◽

Proposed Model ◽

Good Agreement

An analytical method based on a creep model is being developed to investigate the effect of retightening on stress relaxation behavior for high-temperature turbine and valve studs/bolts. In order to validate the approach, the calculated results are compared to the results of uniaxial reloading stress relaxation testing, which were performed by the National Research Institute for Metals of Japan (NRIM) for 12Cr-1Mo-1W-1/4V stainless steel bolting material at 550°C. It was shown that the proposed model based on Altenbach-Gorash-Naumenko creep model for the primary and steady state creep could be applied for the present data. The calculated residual stresses versus time curves were in good agreement with the measured for initial stress level of 273.6MPa at 550°C and for specific reloading time intervals of 24, 72, 240, and 720 hours.

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