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In both unconfined compression and torsional shear tests, day 0 tissue exhibited trends of increasing modulus with frequency, and these trends were maintained in unstimulated controls following 12 days of culture.
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Storage modulus increases with frequency, until the plateau region is reached, and has a higher value than loss modulus.
The two part contributions to the blend modulus varied with frequency.
Figure 7a d shows the variation of imaginary part of electric modulus (M′′) with frequency of Bi4V2 − x Dy x O11 (x = 0.05, 0.10, 0.15 and 0.20) at different temperatures (250 325 °C).
An increase in storage modulus with increasing frequency has been seen in previous studies, but only up to a maximum testing frequency of 8 Hz [ 19] or 10 Hz [ 20, 21].
The differing behaviour of storage modulus and loss modulus with increasing frequency, has implications for mechanical damage to articular cartilage and the onset of osteoarthritis.
The storage modulus G′ increased with frequency following a power law with exponent ∼0.2.
In Fig. 4b, the frequency sweep showed a plateau in G′ in the applied frequency region, over which the modulus varied slightly with frequency.
This paper presents a relaxation function characterising viscoelastic materials whose storage modulus is constant with frequency, and whose loss factor shows the representative peak of damping materials.
Frequency sweep tests (for angular frequencies between 0.1 and 600 rad s−1) were performed for A-TiO2/EG nanofluids, and the evolution of each modulus with the oscillation frequency was obtained, as shown in Figure 8c,d.
DMA testing is then carried out over three different batches of samples (5 specimens each) with variable relative densities to identify the correlation between storage modulus and loss factors with frequency and dynamic force and strain levels.
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