While the dynamic values are very reproducible and consistent with independent measurements, which range between 6.0 and 6.3 GPa (Boudet & Ciliberto 2000; Filippi et al. 1999; Ferry 1980), it is difficult to state the accuracy of the measurements at low frequency. The Young's modulus of PMMA appears in many reference tables, which routinely do
May 02, 2012 · The dynamic modulus of elasticity of concrete can be calculated from the propagation velocity of pressure waves using equation [22.1]. Lower precision requirements are met by estimation of the Poisson ratio; additional measurements of the shear wave velocity and inclusion of equation [22.2] allow for Dynamic modulus of polyisobutylene solutions in superposed Measurements are reported for the first time of the effect on the dynamic modulus of a viscoelastic liquid of the superposition of a steady shearing orthogonal to the oscillatory shearing. The author believes that the study of this flow, together with the case of parallel superposition of a steady and an oscillatory shearing, will clarify the importance of the second invariant of the
Figure 2. Classification of dynamic methods of obtaining shear modulus. several of the resonant column devices and co ncluded that measured dynamic modulii from different device s were consistent. High -strain tests. For the measurement of strain-depen - dent dynamic properties, several devices have been d evelo - ped. Dynamic shear stiffness and damping measurements shear modulus decay G()/Gmax, with G being the secant modulus and Gmax the initial stiffness, and the damping versus strain curves, D(). Therefore, as the reliability of equivalent models is limited to the condition max < v, even if not di-rectly required by current codes, the measurement of the volumetric cyclic threshold shear strain ap-
The objectives of this study are to investigate the relationship between static and dynamic elastic moduli determined using shear-wave velocity measurements and to demonstrate the practical potential of the shear-wave velocity method for in situ dynamic modulus evaluation. Three hundred 150 by 300 mm concrete cylinders were prepared from three different mixtures with Evaluation of Modulus of Rigidity By Dynamic Plate Shear The modulus of rigidity of wood-based panels was measured by the dynamic plate shear method. This involves measuring the torsional vibration of free, square plates. The proposed equation to calculate modulus of rigidity was found to agree within ±5% of the experimentally determined values. The experimentally determined modulus of rigidity values were very close
and laboratory measurements of dynamic shear modulus of Piedmont residual soils, Behavioral Characteristics of Residual Soils, GSP 92, ASCE, Reston, VA, pp. 12-25. FIELD AND LABORATORY MEASUREMENTS OF DYNAMIC SHEAR MODULUS OF PIEDMONT RESIDUAL SOILS James A. Schneider1, Laureano Hoyos Jr.2, Paul W. Mayne3, Emir J. Frequency-dependent viscoelastic parameters of mouse Mar 22, 2011 · Atay S M, Kroenke C D, Sabet A and Bayly P V 2008 Measurement of the dynamic shear modulus of mouse brain tissue in vivo by magnetic resonance elastography J. Biomech. Eng. 130 021013. Crossref PubMed
Quantitative shear modulus measurements in tumors Figure 2 is the shear-wave speed dispersions of both types of tumors. Different tumors exhibit similar frequency-dependent behaviors except Rat 5 with a hyperplasia tumor. Estimated viscoelastic modulus from K-V model is summarized in Table 1 & 2. In vivo measurement of shear modulus of the human Oct 15, 2020 · The shear modulus of the cornea measured over a frequency range of 616 kHz in healthy subjects (ages 2565 years) was 68 kPa, with a 95% confidence interval of 5975 kPa. A handful of studies have attempted to measure the shear modulus of corneal tissues ex vivo using standard tensiometer tests.
Oct 15, 2020 · By contrast, our measurement of shear modulus indicates the opposite:the shear modulus decreases with age (Supplementary Fig. S5). Assuming both measurements are accurate, this discrepancy Mapping tissue shear modulus on Thiel soft-embalmed mouse Mar 06, 2015 · In this study, high speed shear wave imaging technique was applied to a range of soft-embalmed mouse skin, where 3 kHz shear waves were launched with a piezoelectric actuator as an external excitation. The shear wave velocity was estimated from the shear wave images, and used to recover a shear modulus map in the same OCT imaging range.
Measurement of the Dynamic Shear Modulus of Surface Layers I. Theo~ HERMAN A. WATERMAN Department of Applied Physics, Twente University of Technology, Enschede, The Netherlands Received November 8, 1983; accepted March 27, 1984 In measuring the dynamic surface-shear modulus of a surface layer on a liquid, conditions may Measurement of the dynamic shear modulus of surface In measuring the dynamic surface-shear modulus of a surface layer on a liquid, conditions may occurlow-shear modulus and/or high frequencieswhich promote wave-propagation effects to play a predominant role. Measurement of the dynamic shear modulus of surface layers I. Theory. Journal of colloid and interface science, 101(2), 377-383
In the current study we apply MRE to estimate the dynamic shear modulus of the mouse brain in vivo. The frequency used (1200 Hz) is well above those reported previously for in vivo experiments. Estimates of dynamic shear modulus, although subject to limitations inherent to MRE of the small animal brain, are expected to be valuable and complementary to material