Measurement error of Young’s modulus considering the gravity and thermal expansion of thin specimens for<i>in situ</i>tensile testing

Ma, Zhichao; Zhao, Hongwei; Liu, Ren

doi:10.1088/0957-0233/27/6/067001

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…Based on an identical sampling thickness along with the radial direction of cortical bone, uniform specimens (l×w×t: 10×5×2 mm) were prepared through mechanical polishing. In order to achieve the compressive tests under approximate in vivo environment, as shown in figure 1(b), the specimen was immersed in thermostatic (38.5°C) Ringer's solution [15]. Rectangular specimens (figure 1(c)) were used to obtain the stress-strain relationship.…”

Section: Experimental Methodsmentioning

confidence: 99%

Mechanical properties of cortical bones related to temperature and orientation of Haversian canals

Ma¹,

Qiang²,

Zhao³

et al. 2020

Mater. Res. Express

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The understanding of mechanical performances and microscopic failure mechanisms of cortical bones under service condition is necessary prerequisite of fracture prevention, which would support the development of bone tissue engineering and design of bionic bones. By using miniaturized horizontal in situ compression tester, the effects of both temperature and sampling orientations on the compressive strengths and fracture morphologies were investigated. The significant difference between fracture strengths and compressive strains at various temperatures indicated that the cortical bone was sensitive to temperature. Direct experimental evidences revealed the gradually fibrotic trend of fracture surfaces as a function of sampling orientation. Through the Haversian canals distribution analysis, the relationship between the distribution of Haversian canals and fracture path was established. Essentially, the competition between high density Haversian canals and stress concentration factor determines the initiation and propagation of cracks.

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Section: Experimental Methodsmentioning

confidence: 99%

Mechanical properties of cortical bones related to temperature and orientation of Haversian canals

Ma¹,

Qiang²,

Zhao³

et al. 2020

Mater. Res. Express

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“…11,12 From Fig. 3(b), it can be seen that with the increasing diameter of the nanowire, the Young's modulus decreases in the examined range and approaches a value about 160 GPa, which is comparearble with 168 GPa of bulk Pt 27,28 and 120 GPa of the carbon pillar fabricated by FIB. 13 This is similar to the trends previously reported.…”

mentioning

confidence: 87%

Platinum composite nanowires for ultrasensitive mass detection

Hao

Shen

et al. 2017

Applied Physics Letters

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Platinum (Pt) composite nanowires were grown on the tip of tungsten (W) microprobes by focused-electron-beam induced chemical vapor deposition (FEB-CVD). An electrical field was used to drive a transversal mechanical vibration of the nanowires. Such nanowire vibrations were found to display the first and second harmonic resonances with frequencies in the range of tens of MHz. The Young's modulus of the nanowires was estimated to be in the range of (1.4 ± 0.1) × 102 GPa to (4.7 ± 0.2) × 102 GPa, dependent on the wire size. A mass responsivity of 2.1 × 1021 Hz/kg was demonstrated with the minimum detectable mass of about 0.4 attogram. Our results indicated the potentials of FEB-CVD for the fabrication of nano-balances on any surface for ultra-sensitive mechanical applications.

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“…The strain of the miniaturized specimen cannot be measured using the extensometer in accordance with the common standards, such as ASTM E8/E8M [13], because of space limitation. According to [14,21,22,24], the mechanical properties calculated from small specimens present a significant deviation.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain credible properties by such device, the measured curves must be corrected. However, correction methods that have been reported on previously [21][22][23][24] mainly focus on the uniaxial tension testing while ignoring torsion testing and tensiontorsion coupling testing. The measuring error is also related to the shape of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Correction method for mechanical performance testing instrument with tension–torsion coupling loading

Liu

Wang

et al. 2018

Meas. Sci. Technol.

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In our previous study, an instrument for characterizing mechanical properties under multi-mechanical load and multi-physical field coupling conditions was designed and constructed. Given the structural interference, the linear and shear strains in tension–torsion coupling testing were measured indirectly using linear and circular grating encoders rather than the extensometers in a conventional material testing machine. Accordingly, to correct the experimental curves measured using grating encoders, a correction method was proposed using equations based on the analysis of specimen geometry and instrument structure by elasticity theory. The feasibility of the correction method under single load and tension–torsion coupling loads were verified by the contrast tests among curves of grating encoders’, curves of extensometers, and results of a digital image correlation (DIC) measuring system. Test results illustrate that the correction method can convert the displacement measured using grating encoders to the deformation of the specimen in the elastic range, and the measuring error of elastic moduli can be reduced to approximately 1/5–1/50 of the original measurement results. The defect on accuracy of this instrument, which is incompatible with extensometers, can be compensated. Overall, the main sources of error in these devices are the deformation of the load cell and that on the non-gage section of specimen. This conclusion can provide guidance on the design of other similar devices.

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Measurement error of Young’s modulus considering the gravity and thermal expansion of thin specimens forin situtensile testing

Cited by 8 publications

References 25 publications

Mechanical properties of cortical bones related to temperature and orientation of Haversian canals

Mechanical properties of cortical bones related to temperature and orientation of Haversian canals

Platinum composite nanowires for ultrasensitive mass detection

Correction method for mechanical performance testing instrument with tension–torsion coupling loading

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