Effect of Fiber Orientation and Strain Rate on the Nonlinear Uniaxial Tensile Material Properties of Tendon

2003 ◽  
Vol 125 (5) ◽  
pp. 726-731 ◽  
Author(s):  
Heather Anne Lynch ◽  
Wade Johannessen ◽  
Jeffrey P. Wu ◽  
Andrew Jawa ◽  
Dawn M. Elliott
Keyword(s):  
Stress Relaxation ◽  
Strain Rate ◽  
Material Properties ◽  
Poisson’S Ratio ◽  
Constant Strain Rate ◽  
Tensile Tests ◽  
Poisson's Ratio ◽  
Fiber Direction ◽  
Linear Region ◽  
Rate Dependent

Tendons are exposed to complex loading scenarios that can only be quantified by mathematical models, requiring a full knowledge of tendon mechanical properties. This study measured the anisotropic, nonlinear, elastic material properties of tendon. Previous studies have primarily used constant strain-rate tensile tests to determine elastic modulus in the fiber direction. Data for Poisson’s ratio aligned with the fiber direction and all material properties transverse to the fiber direction are sparse. Additionally, it is not known whether quasi-static constant strain-rate tests represent equilibrium elastic tissue behavior. Incremental stress-relaxation and constant strain-rate tensile tests were performed on sheep flexor tendon samples aligned with the tendon fiber direction or transverse to the fiber direction to determine the anisotropic properties of toe-region modulus E0, linear-region modulus (E), and Poisson’s ratio (ν). Among the modulus values calculated, only fiber-aligned linear-region modulus E1 was found to be strain-rate dependent. The E1 calculated from the constant strain-rate tests were significantly greater than the value calculated from incremental stress-relaxation testing. Fiber-aligned toe-region modulus E10=10.5±4.7 MPa and linear-region modulus E1=34.0±15.5 MPa were consistently 2 orders of magnitude greater than transverse moduli (E20=0.055±0.044 MPa,E2=0.157±0.154 MPa). Poisson’s ratio values were not found to be rate-dependent in either the fiber-aligned (ν12=2.98±2.59, n=24) or transverse (ν21=0.488±0.653, n=22) directions, and average Poisson’s ratio values in the fiber-aligned direction were six times greater than in the transverse direction. The lack of strain-rate dependence of transverse properties demonstrates that slow constant strain-rate tests represent elastic properties in the transverse direction. However, the strain-rate dependence demonstrated by the fiber-aligned linear-region modulus suggests that incremental stress-relaxation tests are necessary to determine the equilibrium elastic properties of tendon, and may be more appropriate for determining the properties to be used in elastic mathematical models.

Direct Measurement of Poisson's Ratio in Elastomers

1990 ◽  
Vol 63 (4) ◽  
pp. 473-487 ◽  
Author(s):  
H. P. Kugler ◽  
R. G. Stacer ◽  
C. Steimle
Keyword(s):  
Stress Relaxation ◽  
Strain Rate ◽  
Poisson’S Ratio ◽  
Constant Strain Rate ◽  
Poisson's Ratio ◽  
Relaxation Data ◽  
Optoelectronic System ◽  
Filled Elastomers ◽  
Significant Figures ◽  
Measurement Approach

Abstract Poisson's ratio has been measured in a series of filled elastomers using a novel optoelectronic system. Relative precision of this measurement was found to be approximately 0.7% at 1% strain for this family of materials. The largest contributing error source was determined to be the tolerances that could be obtained in machining the surfaces of the test specimens. As a result of these errors, only three significant figures for Poisson's ratio can be achieved using this measurement approach. Material property tests conducted included constant strain rate and stress relaxation. Constant strain-rate results were used for general characterization, while the stress—relaxation data were employed to investigate time-dependent aspects of Poisson's ratio.

Viscoelastic Characterization of an Epoxy-Based Molding Compound

1995 ◽  
Vol 390 ◽  
Author(s):  
V. H. Kenner ◽  
M. R. Julian ◽  
C. H. Popelar ◽  
M. K. Chengalva
Keyword(s):  
Stress Relaxation ◽  
Strain Rate ◽  
Constant Strain Rate ◽  
Viscoelastic Behavior ◽  
Tensile Tests ◽  
Prony Series ◽  
Master Curves ◽  
Molding Compound ◽  
Relaxation Curves

ABSTRACTThis paper describes the viscoelastic characterization of a highly filled epoxy molding compound commonly used in electronic packaging applications. Both stress relaxation tests and constant strain rate tensile tests were conducted. The material was found to be nonlinear in its viscoelastic behavior and to be amenable to horizontal shifting to form master curves. A representation of the master stress relaxation curves in terms of a Prony series is given, and the use of this representation illustrated in the context of both linear and nonlinear representations of the viscoelastic behavior to predict the results of the constant strain rate experiments.

Temperature and Strain-Rate Dependent Characteristics of AISI 300 Series of Austenitic Stainless Steel

2010 ◽  
Author(s):  
Woong-Sup Park ◽  
Chi-Seung Lee ◽  
Myung-Hyun Kim ◽  
Jae-Myung Lee
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Material Properties ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
Substantial Effect ◽  
Test Results ◽  
Aisi 304L ◽  
Rate Dependent ◽  
Cryogenic Conditions

AISI 300 series austenite stainless steel tensile tests under cryogenic conditions were performed to determine the effect of strain-rate and cryogenic temperature. Four types of commercial austenitic stainless steels widely used in LNG applications, AISI 304L, 316L, 321 and 347, were tested. To analyse strain-rate and temperature dependency, material properties were compared quantitatively. Temperatures ranging from 110K to 293K and strain-rates ranging from 1.6E−4/sec to 1.0E−2/sec have been studied as test conditions. From the test results, both strain-rate and temperature have substantial effect on material properties such as strength and elongation. The experimental results could be used to validate numerical techniques for tested materials as well as structures in cryogenic environment.

Strain-Rate-Dependent Poisson’s Ratio and Stress of Polymer Gels in Solvents Revealed by Ultraslow Stretching

2011 ◽  
Vol 44 (8) ◽  
pp. 3000-3006 ◽  
Author(s):  
Akihiro Konda ◽  
Kenji Urayama ◽  
Toshikazu Takigawa
Keyword(s):  
Strain Rate ◽  
Poisson’S Ratio ◽  
Polymer Gels ◽  
Poisson's Ratio ◽  
Rate Dependent

Research for Viscoplastic Behaviors of SAC405 Pb-Free Solder

2013 ◽  
Vol 690-693 ◽  
pp. 2686-2689
Author(s):  
Ying Mei Li ◽  
Tian Yu Zhao ◽  
Jun Liu ◽  
Bao Zong Huang
Keyword(s):  
Strain Rate ◽  
Constant Strain Rate ◽  
Tensile Tests ◽  
Constitutive Behavior ◽  
Uniaxial Tensile ◽  
Experiment Data ◽  
Rate Dependent ◽  
Free Solder ◽  
Experimental Values ◽  
Load Conditions

Aiming at Pbfree solder Sn4.0Ag0.5Cu (in short, SAC405), the uniaxial tensile tests are accomplished with constant strain-rate under different temperature and strain-rate load conditions. The elastic-viscoplastic behaviors of SAC405 solders are studied. The rate-dependent material main properties are analyzed, such ad yield limit, tensile strength, saturation stress, etc. Partitioned constitutive model is accepted to describe the constitutive behavior of SAC405 solder. The seven parameters in partitioned model are determined by experiment data. The results of numerical simulation are fitted with the experimental values.

On the Poisson's Ratio of the Nucleus Pulposus

2013 ◽  
Vol 135 (10) ◽  
Author(s):  
M. D. Farrell ◽  
P. E. Riches
Keyword(s):  
Strain Rate ◽  
Nucleus Pulposus ◽  
Poisson’S Ratio ◽  
Solid Phase ◽  
Axial Strain ◽  
Intervertebral Disk ◽  
Poisson's Ratio ◽  
Solid Matrix ◽  
Rate Dependency ◽  
Rate Dependent

Existing experimental data on the Poisson's ratio of nucleus pulposus (NP) tissue is limited. This study aims to determine whether the Poisson's ratio of NP tissue is strain-dependent, strain-rate-dependent, or varies with axial location in the disk. Thirty-two cylindrical plugs of bovine tail NP tissue were subjected to ramp-hold unconfined compression to 20% axial strain in 5% increments, at either 30 μm/s or 0.3 μm/s ramp speeds and the radial displacement determined using biaxial video extensometry. Following radial recoil, the true Poisson's ratio of the solid phase of NP tissue increased linearly with increasing strain and demonstrated strain-rate dependency. The latter finding suggests that the solid matrix undergoes stress relaxation during the test. For small strains, we suggest a Poisson's ratio of 0.125 to be used in biphasic models of the intervertebral disk.

Strain-rate dependent material properties of selective laser melted AlSi10Mg and AlSi3.5Mg2.5

2020 ◽  
Vol 62 (6) ◽  
pp. 573-583
Author(s):  
Andreas Lutz ◽  
Lukas Huber ◽  
Claus Emmelmann
Keyword(s):  
Strain Rate ◽  
Material Properties ◽  
Rate Dependent

The Effects of Physical Ageing and of Prior Immersion on the Esc Behaviour of Polycarbonate in Ethanol

1993 ◽  
Vol 305 ◽  
Author(s):  
J. C. Arnold ◽  
A. R. Eccott
Keyword(s):  
Strain Rate ◽  
Immersion Time ◽  
Constant Strain Rate ◽  
Tensile Tests ◽  
Strain Rates ◽  
Physical Ageing ◽  
Diffusion Effects ◽  
Craze Initiation ◽  
Comparison Of Tests

AbstractThe effects of physical ageing and prior immersion time on the ESC behaviour of polycarbonate in ethanol were studied. Constant strain rate tensile tests were performed at a range of strain rates for samples with ageing times varying from 100 hours to 3000 hours and for prior immersion times of between 1 hour and 500 hours. Comparison of tests performed in ethanol and in air gave a good indication of the point of craze initiation. The results showed that there was a reduction in strain to crazing as the strain rate decreased, apart from with the lowest strain rate used. A longer prior immersion time also promoted craze formation. Both of these results are attributable to diffusion effects. Physical ageing had little effect on the ESC behaviour, due to the large amounts of deformation encountered in this system.

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