Investigation of rheological properties of asphalt emulsions
The storage/loss modulus of asphalt emulsions can be effectively predicted by the modified palierne model. The palierne model cannot accurate characterize the relationship between dynamic modulus and average droplet size /interfacial tension. (ethylene glycol) on the gelation evolution of Laponite suspensions:
Evolution of the Crossover Modulus with Oxidative Aging
The crossover modulus is a parameter that is found in the widely-applied Christensen-Anderson (CA) model (13) and has been proposed as an AIP to study the evolution of oxidative aging in asphalt
The relaxation behavior of composite double-base propellants
To determine the long-term Young''s relaxation modulus of composite double-base propellants (CMDB), thermally accelerated aging tests were conducted at 343.15 K for 100 days. Gas chromatography and stress relaxation tests at different aging times were conducted. The aging stress relaxation model has taken into account the
Full article: Rheological, fatigue and relaxation properties of aged
Figure 8 (left-side graphs) shows the relationship between shear stress and relaxation time with increased ageing time, temperature and pressure. By
On the relationship between modulus of elasticity and
The addition of GPT increased the storage modulus by up to five‐fold, crosslink density by up to two‐fold at 20 °C, and glass transition temperature by up to 10.2 °C. Pull‐off adhesion
Storage modulus of BEEM in aging. | Download Table
The experimental results show that there is a tight relationship between storage modulus and the performance of emulsion explosive because both have strong connection with
Storage modulus'' variation in aging and its application in
ABSTRACT An investigation was performed into the stability of bulk emulsion explosive matrix (BEEM) via studying on the variation of storage modulus in aging. The experimental results show that there is a tight relationship between storage modulus (G′) and the stability of BEEM. The increase of the amount of ammonium nitrate (AN) crystals in
Storage modulus'' variation in aging and its application
The experimental results show that there is a tight relationship between storage modulus (G′) and the stability of BEEM. The increase of the amount of ammonium nitrate (AN) crystals in aging leads
(PDF) Storage Modulus'' Variation in Aging and its Application in
The experimental results show that there is a tight relationship between storage modulus (G'') and the stability of BEEM. The increase of the amount of
4.9: Modulus, Temperature, Time
4.9: Modulus, Temperature, Time. The storage modulus measures the resistance to deformation in an elastic solid. It''s related to the proportionality constant between stress and strain in Hooke''s Law, which states that extension increases with force. In the dynamic mechanical analysis, we look at the stress (σ), which is the force per cross
Evolution of the crossover modulus with oxidative aging: A
Aging has also been quantified based on changes in crossover modulus, G Ã c [16], which is simply the modulus at the point where storage modulus G'' and loss modulus G 00 are equal.
Storage modulus'' variation in aging and its application in
ABSTRACT. An investigation was performed into the stability of bulk emulsion explosive matrix (BEEM) via studying on the variation of storage modulus in aging. The experimental results show that there is a tight relationship between storage modulus (G′) and the stability of BEEM.The increase of the amount of ammonium nitrate
4.8: Storage and Loss Modulus
The slope of the loading curve, analogous to Young''s modulus in a tensile testing experiment, is called the storage modulus, E ''. The storage modulus is a measure of how much energy must be put into the sample in order to distort it. The difference between the loading and unloading curves is called the loss modulus, E ".
A viscoelasticity model for polymers: Time, temperature, and
The purpose of the paper is to develop a mathematical model that answers these questions and provides some new physical insights. The structure of this paper is organized as follows. First, the relationship between strain-rate-dependent Young''s modulus and time-dependent relaxation modulus is clarified.
Storage modulus variation in aging and its application in assessing
relationship between storage modulus (G′) and the stability of BEEM. The increase of the amount of ammonium nitrate (AN) crystals in aging leads to the increase of G ′.
Effect of thermo-oxidative aging on the Payne effect and
In the test dynamic strain range, the storage modulus and loss modulus are shown as a function of the applied dynamic strain amplitude and thermo-oxidative aging time. The storage modulus
Effects of High-Temperature Storage on the Elasticity Modulus
The curves showing the relationship between the elasticity modulus and the aging time of the two samples at 200 ° C are shown in Figure 5. Similar trends as those discussed in Figure 4 were
(PDF) Evaluating the relationship between dynamic shear modulus
Nanoindentation test on unaged and 4-year field aged AC showed that due to field aging, binder phase modulus and hardness increased around 123% and 270% respectively; and mastic phase modulus and
Rheological, fatigue and relaxation properties of aged bitumen
A linear relationship was established between the crossover modulus and the stress relaxation ageing indices for the studied bitumen. This relationship suggests that crossover modulus has the potential to be used as a parameter to characterise the bitumen relaxation properties by means of routine tests such as the DSR frequency
Investigation on the low temperature properties of asphalt binder
In this paper, the possibility of using a modulus shift factor correction, b T, for taking into account the deviation of the asphalt binder DSR measurements at very low temperatures, due to the effect of the densification caused by the glass transition phenomena, is experimentally investigated and evaluated rst, DSR tests are performed
Dynamic Mechanical Analysis in the Analysis of
The storage modulus'' change with frequency depends on the transitions involved. Above the T g, the storage modulus tends to be fairly flat with a slight increase with increasing frequency as it is on the
Relationship between crossover temperature and complex modulus
Crossover Temperature Bitumen is an elastic material at low temperatures, so the storage modulus value is higher than the loss modulus. On the other hand, after a specific temperature, the loss
Structure–property relationship for poly(lactic acid) (PLA
Partial storage modulus (E′) increase above Tgas well as additional small peak in loss modulus (E″) of the lower crystallinity sample was assigned to recrystallization. The multiple overlapped peaks in the E″ and tan δ curves and subsequent crystallization along with exothermic peak right after Tg suggests the existence of both relaxed
Aging characterization and degradation of Nitrile
The relationship between stress and strain in viscoelastic materials can be described by the constitutive equation, which is given by: (1) τ t = G γ t ± G η γ o 2-γ (t) 2 (2) γ t, ω = γ o sin ω t (3) τ t, ω = τ 0 sin (ω t + δ) (4) G ∗ t = G ′ t + i G ″ (t) (5) η = G ″ G ′ = tan δ. The time dependent modulus can be
Numerical Conversion Method for the Dynamic
Finally, the results show that when λ = 1.445, the result of R 2 between the calculated relaxation modulus from the dynamic storage modulus and the observed relaxation modulus values is R 2 ≥ 0.995;
High temperature aging of epoxy-based molding compound and
Among all of its components, the one most exposed to the atmosphere is EMC. Therefore, its degradation over time is one of the most relevant aging mechanisms, which could affect the reliability of electronic packages. Aging can be defined as the long-term, irreversible changes that occur in a material due to its exposure to ambient conditions.
Storage-life prediction and relationship between maximum
aging time (Himanshu 2011). The Arrhenius equation needs to obtain the aging rate constant through the aging model, establish the relationship between the
Effects of High-Temperature Storage on the
The curves showing the relationship between the elasticity modulus and the aging time of the two samples at 200 ° C are shown in Figure 5. Similar trends as those discussed in Figure 4 were
Research on Morphological Characteristics and Performance Relationship
To investigate the relationship between the morphological characteristics and performance of Styrene-Butadiene-Styrene (SBS)-modified asphalt, laser confocal microscopy experiments were conducted to observe the microstructures of modified asphalt under various preparation factors and calculate relevant characteristic parameters.
Correlation analysis between aging behavior and rheological indices
The relationship between the C value and the cumulative damage of various asphalt at different aging degree is shown in Fig. 10. (8) C t = G ∗ × sin δ t G ∗ 0 × sin δ initial. Download : Download high-res image (372KB) Download : Download full-size image; Fig. 10. Relationship between parameter C and damage density of asphalt binder.
Unveiling the impact of organic phase aging on the long-term
Irrespective of the polymer content, the storage modulus increases and the loss modulus decreases due to the impact of ultraviolet aging. Furthermore, the magnitude of change
Storage modulus'' variation in aging and its application in
The experimental results show that there is a tight relationship between storage modulus (G′) and the stability of BEEM. The increase of the amount of
Effects of High-Temperature Storage on the Elasticity Modulus of
Temperature, aging time, and filling content were the key factors influencing the degree of thermal oxidation of EMC. In general, the elasticity moduli of
Fractional derivative viscoelastic response of high-viscosity
The Han curve represents the relationship between asphalt''s loss and storage modulus. The Han curve can be used to analyse the dynamic mechanical response of asphalt''s viscous and elastic components. The Black diagram of the three types of HVMA in Fig. 6 depicts the relationship between the complex modulus and
Impact of aging conditions on mechanical properties of
The relationships between the storage modulus and temperature for both aged and unaged samples are shown in Fig. 8. The storage modulus was reported between −30 °C and 50 °C for providing information about the glass transition temperature (around −5 °C).
Microstructural Coarsening and Mechanical Properties of
Relationship between the fraction of Bi phases with storage times. Full size image To further investigate the dissolution behavior of precipitated Bi particles into β-Sn phases, image analysis was used to measure the size distribution of Bi particles as a function of aging time, as shown in Fig. 6 .
Relationship between the Molecular Coil Dimension and the
The relationship between molecular storage modulus of the polymers (prepared by the oilfield-produced water) is analyzed, and both the M w and the concentration of polymer (C p), combined with the core model designed by the pore structure of the actual reservoir, guide the hydrolysis of the indoor oil flooding
Dynamic Mechanical Analysis during polyurethane foaming: Relationship
It can be observed how the onset of the storage modulus build-up and the time at which the foams'' modulus stabilised was longer for the formulations with the least catalyst content (Fig. 3 a and b). In fact, foams REF ( Fig. 3 a.) and BAF ( Fig. 3 b.) took more than 30 min to reach the storage modulus plateau.
NiTi shape memory alloy: Unraveling the role of internal friction in
Subsequently, the phase shift (δ) is calculated using the equation δ = 360 × ∆ t × f (∆ t, time difference between the force and the depth peaks; f, frequency). The storage and loss modulus is calculated using Eqs. (10) & (11), and then IF is calculated by dividing the loss and storage modulus.. Download : Download high-res image (220KB)
EMC Oxidation Under High-Temperature Aging | SpringerLink
The storage modulus was obtained using dynamic mechanical analysis (DMA) under three-point bending mode, which is illustrated schematically in Fig. 3.7. Storage modulus is proportional to the maximum elastic energy stored during one load period, and thus the plot of storage modulus versus temperature obtained from DMA is
Predict the Phase Angle Master Curve and Study the Viscoelastic
The storage modulus of HMA-C is always greater than HMA-60. The mixture''s storage modulus in the low-frequency range increased and decreased in the high-frequency range after warm mix additive was added. The storage modulus of WMA-C is always greater than WMA-60. Obviously, the elastic deformation resistance of HMA-C
Multi-Scale Model for the Aging Performance of Particle-Filled
In addition, the theory of polymer physics was used to determine the relationship between crosslinking density and elastic modulus. Relationships between elastic modulus and dewetting strain were analyzed at the macroscopic level. Based on the observations and analyses, a multi-scale model was developed to predict the aging
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