Accelerated aging test of hydrogenated nitrile butadiene rubber using the time–temperature–strain superposition principle

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 90178-90183 ◽  
Author(s):  
Zhongmeng Zhu ◽  
Chengkai Jiang ◽  
Qian Cheng ◽  
Jianwei Zhang ◽  
Shaoyun Guo ◽  
...  
Keyword(s):  
Fracture Strain ◽  
Superposition Principle ◽  
Accelerated Aging ◽  
Butadiene Rubber ◽  
Test Results ◽  
Short Term ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Temperature Strain

The long-term (~550 days) degradation of fracture strain of HNBR under the reference condition of 60 °C @ zero strain can be predicted using the time–temperature–strain superposition principle with the short-term (<10 days) test results.

scholarly journals Controlled Deterioration and Accelerated Aging Tests to Estimate the Relative Storage Potential of Cucurbit Seed Lots

HortScience ◽  
2008 ◽  
Vol 43 (5) ◽  
pp. 1544-1548 ◽  
Author(s):  
Ibrahim Demir ◽  
Kazim Mavi
Keyword(s):  
Moisture Content ◽  
Correlation Coefficient ◽  
Accelerated Aging ◽  
Aluminum Foil ◽  
Storage Conditions ◽  
Test Results ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Radicle Emergence ◽  
Controlled Deterioration

The laboratory germination (radicle emergence) percentages of 9 watermelon, 12 melon, and 7 cucumber seed lots were tested after storing in relatively adverse storage conditions of 25 °C and 12% mc for 6, 12, and 18 months in sealed aluminum foil packets. The laboratory germination (radicle emergence) of lots was determined after controlled deterioration (CD) at 45 °C with 20% or 24% moisture content (mc) for 48, 72, 96, 120, and 144 h. The accelerated aging test (AA) was conducted at 45 °C for the same aging periods. A number of seed lots was dead by 12 and 18 months in watermelon and cucumber, respectively. Various combinations of test regimens were found to be correlated with laboratory germination after 6 months storage, but the most consistent regimens for AA tests was 96 h at 45 °C in all species (r = 0.71 to 0.98). In the CD tests, 72 h with 20% mc at 45 °C gave the best correlation (r = 0.86 to 0.96). These conditions of highest correlation were observed after laboratory germination after 6 months storage and are suggested as good predictors of storage life in cucurbit seed lots. The initial standard germination before storage was also significantly correlated with seed longevity, but the correlation coefficient was generally lower (r = 0.60 to 0.83) than the AA and CD test results and separation of lots less clear.

Accelerated Aging Test and Study of Storage Life Prediction of NBR O-Ring

2011 ◽  
Vol 415-417 ◽  
pp. 184-190 ◽  
Author(s):  
Jun Pan ◽  
Shi Wei Xu ◽  
Wen Hua Chen ◽  
Xiao Yun Wang ◽  
Ping Qian ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Least Square Method ◽  
Storage Conditions ◽  
Storage Life ◽  
Least Square ◽  
Butadiene Rubber ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Servo Mechanism ◽  
Hydraulic Servo

Nitrile Butadiene Rubber (NBR) is a kind of common sealing materials for the electric hydraulic servo mechanism, there exists the aging failure problem in its storage environment, which is the key factor determining the storage life of the electric hydraulic servo mechanism. Through the analysis of aging failure mechanism of the NBR o-ring, the degradation path that varies with the changes of aging time based on compression set was established. And the Arrhenius equation, which is the acceleration equation of the aging reaction velocity varies with the changes of temperature, was established as well. In order to obtain the related parameters of the model, the accelerated aging test was conducted and its data were processed by applying the approximation standards and least square method. Also through the test the prediction of storage life of NBR o-ring under special storage conditions was made, and its predicted results were basically identical with the actual storage life.

scholarly journals Artificial and Natural Aging of Polypropylene Used in Passenger Vehicle Bumpers

2021 ◽  
Vol 58 (2) ◽  
pp. 201-210
Author(s):  
Hongshen Zhang ◽  
Hongfei Zheng
Keyword(s):  
Accelerated Aging ◽  
Natural Aging ◽  
Short Term ◽  
Uv Aging ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Wide Range ◽  
Aging Properties ◽  
Materials Used ◽  
The Impact

Polypropylene (PP) has a wide range of applications in the automobile bumpers due to its many excellent properties. Mechanical properties of PP for automobile bumpers are investigated through an artificial accelerated aging test. The aging rules after different years of normal use and the artificial accelerated aging test are analyzed. The correlation between natural and artificially accelerated aging is also explored. It provides a reference for the study of the aging properties of polymers for automotive applications. Results show that the UV aging test can effectively simulate changes in tensile and bending strengths after natural aging and can be used to evaluate the weathering resistance of PP materials used in automotive bumpers. The tensile and bending strengths of these materials remain good during aging, and elongation is sensitive to aging. The short-term artificial accelerated aging test does not exert a significant influence on the impact strength of materials, and artificial accelerated aging does not completely reproduce the aging process of the material.

scholarly journals Physiological quality of soybean seeds of cultivars submitted to harvesting delay and its association with seedling emergence in the field

2013 ◽  
Vol 35 (2) ◽  
pp. 147-152 ◽  
Author(s):  
Fábio Oliveira Diniz ◽  
Múcio Silva Reis ◽  
Luiz Antônio dos Santos Dias ◽  
Eduardo Fontes Araújo ◽  
Tuneo Sediyama ◽  
...  
Keyword(s):  
Seed Quality ◽  
Seedling Emergence ◽  
Accelerated Aging ◽  
Soybean Seeds ◽  
Test Results ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Physiological Quality ◽  
The Relationship

With the aim of studying the relationship between the physiological quality of soybean seeds submitted to three harvest times and seedling emergence in the field, seeds of cultivars UFV-16, Splendor, Vencedora, Confiança, UFV-18, UFV-TN 105, Garantia and Celeste were harvested at stages R8, R8+15 and R8+30 days. The following tests were performed: accelerated aging, electrical conductivity, emergence in sand, emergence speed index and seedling emergence in the field. Germination and vigor were reduced in seeds harvested at 30 days after stage R8 in all the tests, except for the accelerated aging test, which showed a decline in vigor seeds harvested with a delay of 15 days. Seeds of cultivars UFV-16, Confiança and Garantia showed lower physiological quality in most tests, while the seeds of cultivar Celeste had higher physiological quality than the others. There was similarity between the test results of seed quality and seedling emergence in the field.

Study of Tensile Bond Strength for Structural Silicone Sealants after Artificial Accelerated Aging

2018 ◽  
Vol 768 ◽  
pp. 13-18
Author(s):  
Yu Kang Sun ◽  
De Tian Wan ◽  
Yi Wang Bao ◽  
Xiao Gen Liu ◽  
Yan Qiu
Keyword(s):  
Bond Strength ◽  
Accelerated Aging ◽  
Tensile Bond Strength ◽  
High Humidity ◽  
Test Results ◽  
Shore Hardness ◽  
Structural Silicone ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Freeze Test

Tensile bond strength is one of the most significant properties for structural silicone sealants used in the glass curtain walls. During the service process, aging of the silicone sealants shall be involved in comprehensive actions of environment factors, e.g. temperature, humidity, and ultraviolet light etc. In this study, artificial accelerated aging test was conducted to make clear the development of tensile bond strength, Shore hardness and elongation. The test results show that: (i) the specimens under damp-heat test have more degeneration than specimens under humidity-freeze test; (ii) the environment of high temperature and high humidity leads to the change of tensile bond, Shore hardness, elongation, and results in interfacial failure of samples.

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