A review of the determination of dynamic properties of polymers and composites

Norwood, L. S.

doi:10.1016/0010-4361(79)90018-1

Cited by 9 publications

(10 citation statements)

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“…There exist several different methods for measuring the mechanical properties of the materials in general and polymers in particular [5]. Most engineering stress-strain data are measured by using quasi-static tests, although instrumented impact tests can also be used [6]. Commonly, such tests are carried out in a uniaxial tension or in bending (3 point or 4 point) using well-established methods [5].…”

Section: Review Of the Major Currently Available Dynamic Test Methodsmentioning

confidence: 99%

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Development of a torsion pendulum and its application to measuring the dynamic modulus of adhesives from pre-gelation to the cured state

Adams

Silva

2014

Meas. Sci. Technol.

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The fact that adhesive modulus increases enormously during the cure process from zero to the order of a few GPa makes it difficult or impossible for any commercially available modulus measurement instrument to be used. In order to develop an apparatus to measure how the mechanical properties of the tested adhesive change with time so that the cure process can be monitored and internal residual cured stress can be calculated, a variety of existing methods and apparatuses have been looked at and some tested. A novel form of torsional pendulum for measuring the change of adhesive modulus with time and temperature has been developed. The novelty of the apparatus lies in using a low torsional stiffness soft rubber membrane to physically hold the sample in a uniaxial geometry. It was possible to oscillate the specimen over a range of frequencies, so that the measured dynamic shear modulus range of tested adhesives can be extended to the range of 0.005 MPa to over 1 GPa.

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Section: Review Of the Major Currently Available Dynamic Test Methodsmentioning

confidence: 99%

“…where K t is the torsional rigidity, J is the second moment of area, G is the shear modulus, L and r are the length and diameter of the specimen, respectively. For a viscoelastic material that undergoes harmonic motion, G can be changed to G * (complex modulus) according to the correspondence principle [6].…”

Section: New Torsion Pendulum Testmentioning

confidence: 99%

Development of a torsion pendulum and its application to measuring the dynamic modulus of adhesives from pre-gelation to the cured state

Adams

Silva

2014

Meas. Sci. Technol.

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“…The material properties were taken from the literature (Bossy et al 2002) and the properties database in the numerical simulation software Wave2000 Pro (Cyberlogic, USA), respectively (see table 1). To allow for the material damping in acrylic, viscoelastic attenuation data (Read and Dean 1978) were included in the numerical calculation for the water-loaded acrylic plate at 200 kHz (table 1).…”

Section: Lamb Wave Theorymentioning

confidence: 99%

Ultrasonic propagation in cortical bone mimics

et al. 2006

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Understanding the velocity and attenuation characteristics of ultrasonic waves in cortical bone and bone mimics is important for studies of osteoporosis and fractures. Three complementary approaches have been used to help understand the ultrasound propagation in cortical bone and bone mimics immersed in water, which is used to simulate the surrounding tissue in vivo. The approaches used were Lamb wave propagation analysis, experimental measurement and two-dimensional (2D) finite difference modelling. First, the water loading effects on the free plate Lamb modes in acrylic and human cortical bone plates were examined. This theoretical study revealed that both the S0 and S1 mode velocity curves are significantly changed in acrylic: mode jumping occurs between the S0 and S1 dispersion curves. However, in human cortical bone plates, only the S1 mode curve is significantly altered by water loading, with the S0 mode exhibiting a small deviation from the unloaded curve. The Lamb wave theory predictions for velocity and attenuation were then tested experimentally on acrylic plates using an axial transmission technique. Finally, 2D finite difference numerical simulations of the experimental measurements were performed. The predictions from Lamb wave theory do not correspond to the measured and simulated first arrival signal (FAS) velocity and attenuation results for acrylic and human cortical bone plates obtained using the axial transmission technique, except in very thin plates.

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“…A technique which overcomes these difficulties is the vibrating reed test (Read and Dean 1978). Flexural resonant vibrations are induced in the substrate, and the shift in resonant frequency which occurs when a film is deposited on the substrate is used to calculate the Young's modulus of the film.…”

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confidence: 99%