Study on long-term rheological characteristics of polymer gel and prediction of its creep fracture time

2021 ◽  
Vol 201 ◽  
pp. 108445
Author(s):  
Lei Zhang ◽  
Weichu Yu ◽  
Peng Ma ◽  
Liming Zheng ◽  
Ying Zhang
Keyword(s):  
Rheological Characteristics ◽  
Polymer Gel ◽  
Creep Fracture ◽  
Fracture Time

scholarly journals Material Characterization of Magnetorheological Elastomers with Corroded Carbonyl Iron Particles: Morphological Images and Field-dependent Viscoelastic Properties

2019 ◽  
Vol 20 (13) ◽  
pp. 3311 ◽  
Author(s):  
Siti Aishah Binti Abdul Aziz ◽  
Saiful Amri Mazlan ◽  
Nur Azmah Nordin ◽  
Nor Azlin Nazira Abd Rahman ◽  
U Ubaidillah ◽  
...  
Keyword(s):  
Carbonyl Iron ◽  
Matrix Material ◽  
Rheological Characteristics ◽  
Iron Particles ◽  
Ambient Conditions ◽  
X Ray ◽  
Field Dependent ◽  
Mr Effect

High temperatures and humidity could alter the field-dependent rheological properties of MR materials. These environmental phenomena may accelerate the deterioration processes that will affect the long-term rheological reliability of MR materials such as MR elastomer (MRE). This study therefore attempts to investigate the field-dependent rheological characteristics of MRE with corroded carbonyl iron particles (CIPs). The corroded CIPs were treated with hydrochloric acid (HCl) as a way of providing realistic environments in gauging the CIPs reaction towards the ambient conditions. The corroded CIPs along with silicone rubber as a matrix material were used in the fabrication of the MRE samples. To observe the effect of HCl treatment on the CIPs, the morphological observations of MREs with non-corroded and corroded CIPs were investigated via field emission scanning electron microscopy (FESEM), energy-dispersive x-ray spectroscopy (EDX) and x-ray diffractometer (XRD). In addition, the magnetic properties were examined through the vibrating sample magnetometer (VSM), while the field-dependent rheological characteristics such as the storage modulus of MRE with the corroded CIPs were also tested and compared with the non-corroded CIPs. The results showed that the corroded CIPs possessed hydrangea-like structures. In the meantime, it was identified that a sudden reduction of up to 114% of the field-dependent MR effect of MRE with the corroded CIPs was observed as a result of the weakened interfacial bonding between the CIPs and the silicon in the outer layers of the CIPs structure.

Rheological Characteristics of Weak Rock Mass and Effects on the Long-Term Stability of Slopes

2013 ◽  
Vol 47 (6) ◽  
pp. 2253-2263 ◽  
Author(s):  
Tianhong Yang ◽  
Tao Xu ◽  
Hongyuan Liu ◽  
Chunming Zhang ◽  
Shanyong Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Weak Rock ◽  
Rheological Characteristics ◽  
Term Stability ◽  
Long Term Stability ◽  
Stability Of Slopes ◽  
Weak Rock Mass

Critical Review and Appraisal of Traditional and New Procedures for the Quantification of Creep Fracture Behavior Using 1Cr–1Mo–0.25V Steel

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
M. Evans
Keyword(s):  
Large Scale ◽  
Rupture Life ◽  
Design Data ◽  
Data Set ◽  
New Approach ◽  
Creep Fracture ◽  
Scale Test ◽  
New Procedures ◽  
Term Data

The approaches traditionally used to quantify creep and creep fracture are critically assessed and reviewed in relation to a new approach proposed by Wilshire and Scharning. The characteristics, limitations, and predictive accuracies of these models are illustrated by reference to information openly available for the bainitic 1Cr–1Mo–0.25V steel. When applied to this comprehensive long-term data set, the estimated 100,000–300,000 h strength obtained from the older so called traditional methods varied considerably. Further, the isothermal predictions from these models became very unstable beyond 100,000 h. In contrast, normalizing the applied stress through an appropriate ultimate tensile strength value not only reduced the melt to melt scatter in rupture life, but also the 100,000 h strengths determined from this model for this large scale test program are predicted very accurately by extrapolation of creep life measurements lasting less than 5000 h. The approach therefore offers the potential for reducing the scale and cost of current procedures for acquisition of long-term engineering design data.

scholarly journals The Effect of Resins on Rheological and ageing Characteristics of Bitumen for Pavement

2019 ◽  
Vol 258 ◽  
pp. 01004
Author(s):  
Madi Hermadi ◽  
Willy Pravianto
Keyword(s):  
Ageing Process ◽  
Rheological Characteristics ◽  
Natural Rock ◽  
Complex Shear ◽  
Petroleum Bitumen ◽  
New Type ◽  
Normal Ageing ◽  
Temperature Levels ◽  
Materials Used

Bitumen consists of thousands of hydrocarbon molecule types with each molecule contributes to the overall bitumen characteristics. Therefore, it is important to identify the influence of each chemical component of bitumen that altogether constructs the bitumen characteristics. This is likely to be completed by evaluating and modifying bitumen components to produce a new type of bitumen with better characteristics. The realistic way to do this is by analysing it in groups or fractions; one group or fraction comprises bitumen molecules with similar characteristics. This paper aims to address this issue by describing the effect of resins on rheological characteristics of bitumen at various ageing process stages. The materials used in this study were Buton rock asphalt or natural rock asphalt from Buton Island in Indonesia which was from Lawele region and petroleum bitumen penetration grade 80/100 from a refinery in Kemaman Malaysia. The materials were tested to identify their charactheristics and the resins components were also extracted and tested with Corbett method. Each extracted resin (from Buton rock asphalt bitumen and petroleum bitumen) was blended in proportions of 0%, 5%, and 10% with the Kemaman petroleum bitumen as a bitumen medium. The blended bitumen samples were also tested for their rheological characteristics using Dynamic Shear Rheometer. Each sample was tested at five different temperature levels (46°C, 52°C, 58°C, 64°C and 70°C) and at un-aged, artificial short-term aged (RTFOT-aged), and artificial long-term aged (PAV-aged) conditions. The results indicated that the source of resins had a significant value of 0.065 or larger than the 0.05 critical point value. There was no difference in the effect of the experiments using either Buton rock asphalt or petroleum bitumen on the complex shear modulus G*. At fresh condition, there was no effect of adding resins on the bitumen rheological characteristics except for the elastic modulus (G’). However, the effect increased over the RTFOT-ageing and PAV-aging level because of the normal ageing process.

Well-defined triblock copolymer/TiO2 composite gel electrolytes for high-performance dye-sensitized solar cells

2019 ◽  
Vol 7 (24) ◽  
pp. 14743-14752 ◽  
Author(s):  
Seung Mo Seo ◽  
Chang Ki Kim ◽  
Hwan Kyu Kim
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Dye Sensitized Solar Cells ◽  
Polymer Gel ◽  
Dye Sensitized ◽  
Gel Electrolytes ◽  
Device Stability ◽  
Composite Gel ◽  
Sensitized Solar Cells

Two kinds of triblock copolymers (SGT-602 and SGT-604) were prepared and applied to dye-sensitized solar cells (DSSCs). The polymer gel electrolytes with a TiO2 nanofiller achieved comparable efficiencies to liquid-state DSSCs (η: 9.86%), and exhibited excellent long-term device stability under 1 sun illumination at 50 °C.

Experimental Study on Creep of Highly-Weathered Breccia

2013 ◽  
Vol 477-478 ◽  
pp. 588-591 ◽  
Author(s):  
Qian Zhang ◽  
Shu Cai Li ◽  
Li Ping Li ◽  
Qian Qing Zhang
Keyword(s):  
Rock Mass ◽  
Water Content ◽  
Creep Deformation ◽  
Fractured Rock ◽  
Soft Rock ◽  
Rheological Characteristics ◽  
Main Research ◽  
Rock Structure ◽  
Influence Of Water

Mechanical property of rock is the main research object of rock mechanics. In order to further learn the rheological characteristics of soft fractured rock mass, the creep test of highly-weathered breccia with different water content of 0.65%, 1.88%, 4.03% using low-intensity uniaxial creepmeter developed by Shandong University is processed, and the strain-time curves under different water conditions and the corresponding variation of creep curves with different stress levels and moisture states are obtained. The experimental results show that the higher water content is, the larger creep deformation is and the longer time of creep deformation reaching stable is, in other words, the influence of water content on the rheological characteristics of rock mass is also significant. Finally, the conclusion that softening critical load (long-term strength) and softening critical depth of soft rock are greatly reduced due to the effect of water on rock structure and mechanical parameters is obtained to provide the fundamental reference for the follow-up tests and similar engineering.

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