scholarly journals Strain Rate and Temperature Effects on Tensile Properties of Polycrystalline Cu6Sn5 by Molecular Dynamic Simulation

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1415
Author(s):  
Wei Huang ◽  
Kailin Pan ◽  
Jian Zhang ◽  
Yubing Gong
Keyword(s):  
Strain Rate ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Temperature Effects ◽  
High Strain ◽  
Young's Modulus ◽  
Voronoi Tessellation ◽  
Strain Rates ◽  
Electronic Products ◽  
Electrical Connections

Intermetallic compounds (IMCs) are essential in the soldering of electronic products and are composed mainly of Cu6Sn5 and Cu3Sn. They must maintain reliable mechanical and electrical connections. As they are usually only a few microns thick, and it is difficult to study their mechanical properties by traditional methods. In this study, a 100 Å × 100 Å × 100 Å polycrystal with 10 grains was created by Atomsk through Voronoi tessellation based on a Cu6Sn5 unit cell. The effects of the temperature and strain rate on the tensile properties of the polycrystalline Cu6Sn5 were analyzed based on MEAM potential function using a molecular dynamics (MD) method. The results show that Young’s modulus and ultimate tensile strength (UTS) of the polycrystalline Cu6Sn5 decrease approximately linearly with an increase in temperature. At high strain rates (0.001–100 ps−1), Young’s modulus and UTS of the Cu6Sn5 are logarithmic with respect to the strain rate, and both increase with an increase in strain rate. In addition, at low strain rates (0.00001–0.0005 ps−1), the UTS has a quadratic increase as the strain rate increases.

scholarly journals Applicability of Mechanical Tests for Biomass Pellet Characterisation for Bioenergy Applications

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1329 ◽  
Author(s):  
Orla Williams ◽  
Simon Taylor ◽  
Edward Lester ◽  
Sam Kingman ◽  
Donald Giddings ◽  
...  
Keyword(s):  
Strain Rate ◽  
Young’S Modulus ◽  
High Strain ◽  
Young's Modulus ◽  
Mechanical Tests ◽  
Strain Rates ◽  
High Strain Rates ◽  
Dynamic Mechanical ◽  
Pellet Strength ◽  
Biomass Pellet

In this paper, the applicability of mechanical tests for biomass pellet characterisation was investigated. Pellet durability, quasi-static (low strain rate), and dynamic (high strain rate) mechanical tests were applied to mixed wood, eucalyptus, sunflower, miscanthus, and steam exploded and microwaved pellets, and compared to their Hardgrove Grindability Index (HGI), and milling energies for knife and ring-roller mills. The dynamic mechanical response of biomass pellets was obtained using a novel application of the Split Hopkinson pressure bar. Similar mechanical properties were obtained for all pellets, apart from steam-exploded pellets, which were significantly higher. The quasi-static rigidity (Young’s modulus) was highest in the axial orientation and lowest in flexure. The dynamic mechanical strength and rigidity were highest in the diametral orientation. Pellet strength was found to be greater at high strain rates. The diametral Young’s Modulus was virtually identical at low and high strain rates for eucalyptus, mixed wood, sunflower, and microwave pellets, while the axial Young’s Modulus was lower at high strain rates. Correlations were derived between the milling energy in knife and ring roller mills for pellet durability, and quasi-static and dynamic pellet strength. Pellet durability and diametral quasistatic strain was correlated with HGI. In summary, pellet durability and mechanical tests at low and high strain rates can provide an indication of how a pellet will break down in a mill.

Tensile properties of ultra-high-molecular-weight polyethylene single yarns at different strain rates

2019 ◽  
Vol 54 (11) ◽  
pp. 1453-1466 ◽  
Author(s):  
Hongxu Wang ◽  
Paul J Hazell ◽  
Krishna Shankar ◽  
Evgeny V Morozov ◽  
Zlatko Jovanoski ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Strain Rate ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Failure Strain ◽  
Young's Modulus ◽  
Strain Rates ◽  
Noticeable Effect ◽  
Strength Failure ◽  
Axial Splitting

This paper presents the details of experimental work on characterising the tensile properties of UHMWPE (Spectra® 1000) single yarns at different strain rates from 3.3 × 10−5 to 400/s. According to the measured stress–strain curves, there was a transition from ductile to brittle behaviour as the strain rate increased from 3.3 × 10−5 to 0.33/s; the tensile properties were highly sensitive to strain rate in this range. Specifically, the tensile strength and Young’s modulus increased distinctly with increasing strain rate while the failure strain and toughness decreased. However, these tensile properties were not dependent on strain rate over the range from 0.33 to 400/s. The results showed that the measured tensile strength, failure strain and Young’s modulus were independent of the tested gauge lengths (25 and 50 mm). Moreover, yarn type (warp and weft) had a noticeable effect on tensile strength, but the effect of yarn type on failure strain and Young’s modulus was negligible. The microscopic examination of fractured fibres’ ends revealed that fibrillation and axial splitting were the dominant fracture modes at low strain rates, while the fibres failed in a more brittle manner with little fibrillation at high strain rates.

Impact tensile behavior and frequency response of 3D braided composites

2011 ◽  
Vol 82 (3) ◽  
pp. 280-287 ◽  
Author(s):  
Xuehui Gan ◽  
Jianhua Yan ◽  
Bohong Gu ◽  
Baozhong Sun
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Tensile Properties ◽  
High Strain ◽  
Tensile Modulus ◽  
Tensile Failure ◽  
Uniaxial Tensile ◽  
Strain Rates ◽  
Braided Composites ◽  
3D Braided Composites

The uniaxial tensile properties of 4-step 3D braided E-glass/epoxy composites under quasi-static and high-strain rate loadings have been investigated to evaluate the tensile failure mode at different strain rates. The uniaxial tensile properties at high strain rates from 800/s to 2100/s were tested using the split Hopkinson tension bar (SHTB) technique. The tensile properties at quasi-static strain rate were also tested and compared with those in high strain rates. Z-transform theory is applied to 3D braided composites to characterize the system dynamic behaviors in frequency domain. The frequency responses and the stability of 3D braided composites under quasi-static and high-strain rate compression have been analyzed and discussed in the Z-transform domain. The results indicate that the stress-strain curves are rate sensitive, and tensile modulus, maximum tensile stress and corresponding tensile strain are also sensitive to the strain rate. The tensile modulus, maximum tensile stress of the 3D braided composites are linearly increased with the strain rate. With increasing of the strain rate (from 0.001/s to 2100/s), the tensile failure of the 3D braided composite specimens has a tendency of transition from ductile failure to brittle failure. The magnitude response and phase response is very different in quasi-static loading with that in high-strain rate loading. The 3D braided composite system is more stable at high strain rate than quasi-static loading.

Measurement of Young’s Modulus of Human Tympanic Membrane at High Strain Rates

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Huiyang Luo ◽  
Chenkai Dai ◽  
Rong Z. Gan ◽  
Hongbing Lu
Keyword(s):  
Mechanical Behavior ◽  
Tympanic Membrane ◽  
Young’S Modulus ◽  
High Strain ◽  
Young's Modulus ◽  
Strong Dependence ◽  
Strain Rates ◽  
Loading Conditions ◽  
High Strain Rates ◽  
Human Tympanic Membrane

The mechanical behavior of human tympanic membrane (TM) has been investigated extensively under quasistatic loading conditions in the past. The results, however, are sparse for the mechanical properties (e.g., Young's modulus) of the TM at high strain rates, which are critical input for modeling the mechanical response under blast wave. The property data at high strain rates can also potentially be converted into complex modulus in frequency domain to model acoustic transmission in the human ear. In this study, we developed a new miniature split Hopkinson tension bar to investigate the mechanical behavior of human TM at high strain rates so that a force of up to half of a newton can be measured accurately under dynamic loading conditions. Young’s modulus of a normal human TM is reported as 45.2–58.9 MPa in the radial direction, and 34.1–56.8 MPa in the circumferential direction at strain rates 300–2000 s−1. The results indicate that Young’s modulus has a strong dependence on strain rate at these high strain rates.

scholarly journals Effect of Fiber Blending Ratio on the Tensile Properties of Steel Fiber Hybrid Reinforced Cementitious Composites under Different Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4504
Author(s):  
Minjae Son ◽  
Gyuyong Kim ◽  
Hongseop Kim ◽  
Sangkyu Lee ◽  
Yaechan Lee ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Synergistic Effect ◽  
Strain Rate ◽  
Tensile Properties ◽  
High Performance ◽  
Steel Fiber ◽  
High Strain ◽  
Strain Rates ◽  
Cementitious Composite ◽  
Hybrid Fiber

In this study, a high-performance hybrid fiber-reinforced cementitious composite (HP-HFRCC) was prepared, by mixing hooked steel fiber (HSF) and smooth steel fiber (SSF) at different blending ratios, to evaluate the synergistic effect of the blending ratio between HSF and SSF and the strain rate on the tensile properties of HP-HFRCC. The experimental results showed that the micro- and macrocrack control capacities of HP-HFRCC varied depending on the blending ratio and strain rate, and the requirement for deriving the appropriate blending ratio was confirmed. Among the HP-HFRCC specimens, the specimen mixed with HSF 1.0 vol.% and SSF 1.0 vol.% (H1.0S1.0) exhibited a significant increase in the synergistic effect on the tensile properties at the high strain rate, as SSF controlled the microcracks and HSF controlled the macrocracks. Consequently, it exhibited the highest strain rate sensitivities of tensile strength, strain capacity, and peak toughness among the specimens evaluated in this study.

Effect of Hot Forging Strain Rate on the Microstructure and Mechanical Properties of TC4-DT Titanium Alloy

2016 ◽  
Vol 849 ◽  
pp. 271-275 ◽  
Author(s):  
Guo Qiang Shang ◽  
Xin Nan Wang ◽  
Yue Fei ◽  
Jing Li ◽  
Li Wei Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Strain Rate ◽  
Tensile Properties ◽  
High Strain ◽  
Hot Forging ◽  
Fatigue Property ◽  
Strain Rates ◽  
High Fatigue ◽  
Metallurgical Defects

The microstructures, tensile properties and fatigue property of TC4-DT titanium alloy hot die forged under different strain rates were investigated. The results show that the microstructures and mechanical properties of TC4-DT titanium alloy die forging using different strain rates can meet the requirement of technical standard. At the strain rates of 1mm/s and 10mm/s, the microstructure was not sensitive to the strain rate, and the alloys showed uniform, fine and fuzzy crystal grains, and no metallurgical defects. However, more uniform tensile properties in different orientations were obtained by the low strain rates (1mm/s), while the high strain rate (10mm/s) could lead to slightly increase in strength but obviously decline in ductility. High fatigue strength could be obtained by the low strain rate, but the fracture toughness and fatigue crack growth rate were not sensitive to the strain rates.

Strain Rate Effect on the Mechanical Properties of Recycled Wood Particles/ Epoxy Composites

2014 ◽  
Vol 624 ◽  
pp. 57-61
Author(s):  
Elammaran Jayamani ◽  
Sinin Hamdan ◽  
Ng Shwu Ee ◽  
Tan Yong Siang ◽  
Dexter Liew Tze Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Strain Rate ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Weight Fraction ◽  
Weight Percentage ◽  
Plastic Composite ◽  
Wood Particles

The objective of this research is to study the mechanical properties of recycled wood particles epoxy matrix composites through the manipulation of composites wood particles size and weight fraction for tensile tests with different strain rate. Wood saw dust has been collected from a saw mill, dried and sieved into 300 and 600 μm. Unsieved wood particles were also used in this study. Each of the categories of wood particles was mixed into Epoxy resin with weight percentage of 20% and 40% of total composites to produce dumbbell-shaped tensile test specimens. Result shows that there is an optimum wood particles size where the tensile properties are at the highest before the properties start to decrease with increasing particles size, except for 20% wt. wood particles whereby the Young’s modulus is the highest with mix (largest) wood particles. With increasing wood particles weight percentage, tensile strength decreased while young’s modulus increased. A wood plastic composite (WEC) was shown to be strain rate sensitive whereby tensile properties increased with increasing strain rate. Our study proves that WPC can be very advantageous due to its higher average tensile strength and also high young’s modulus compared to commonly used materials in the industries.

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