The indirect measurement of tensile strength for a higher temperature by the new model IGDMC(1,n)

Measurement ◽  
2008 ◽  
Vol 41 (6) ◽  
pp. 662-675 ◽  
Author(s):  
Tzu-Li Tien
Keyword(s):  
Tensile Strength ◽  
Indirect Measurement ◽  
New Model ◽  
Higher Temperature

Effects of Sr Addition on Mechanical Properties and Microstructure of Mg-6Al Magnesium Alloy

2011 ◽  
Vol 686 ◽  
pp. 120-124
Author(s):  
Jin Ping Fan ◽  
She Bin Wang ◽  
Bing She Xu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Strengthening Mechanism ◽  
Microstructure And Mechanical Properties ◽  
Higher Temperature ◽  
Lower Temperature

The effects of Sr addition on the mechanical properties and microstructure of Mg-6Al mag- nesium alloy both at 25 °C and at 175 °C were investigated by means of OM, SEM and EDS and XRD. Upon the Sr addition of 2%, the tensile strength was increased by 7.2% to 184.4MPa at 25 °C, while it was increased by 30% to 155.4MPa at 175 °C. The strengthening mechanism of Mg-6Al-xSr at lower temperature (25 °C) was different from that at higher temperature (175°C). The results show that the addition of strontium effectively improved the microstructure and mechanical properties of magnesium alloy.

scholarly journals Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Enze Jin ◽  
Denghao Ma ◽  
Zeshuai Yuan ◽  
Wenting Sun ◽  
Hao Wang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Tensile Modulus ◽  
Treatment Temperature ◽  
Matrix Interface ◽  
Oxidation Treatment ◽  
Pull Out ◽  
Special Surface ◽  
Higher Temperature ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Here, we show that when the oxidation treatment temperature exceeded 600°C, the tensile strength of SiC/SiC begins to decrease. Oxidation leads to the damages on the PyC fiber/matrix interface, which is replaced by SiO2 at higher temperature. The fracture mode converts from fiber pull-out to fiber-break as the fiber/matrix interface is filled with SiO2. Oxidation time also plays an important role in affecting the tensile strength of SiC/SiC. The tensile modulus decreases with temperature from RT to 800°C, then increases above 800°C due to the decomposition of remaining CSi x O y and crystallization of the SiC matrix. A special surface densification treatment performed in this study is confirmed to be an effective approach to reduce the oxidation damages and improve the tensile strength of SiC/SiC after oxidation.

scholarly journals Proposition of a net-like model of snow

1993 ◽  
Vol 18 ◽  
pp. 72-78
Author(s):  
Zempachi Watanabe
Keyword(s):  
Tensile Strength ◽  
Thin Section ◽  
Published Data ◽  
New Model ◽  
Polycrystalline Ice ◽  
Real State

Thin-section photographs show that snow consists of lumpy parts and connecting branches. The model proposed here agrees with this real state. This new model is derived from four packing forms of isometric spheres by shrinking the original spheres while maintaining and connecting points of contact as a column. The texture of the model can be varied by setting the packing form, the shrinking ratio and the thickness of connecting branches. When the density and strength of the material of the model are set to the values of polycrystalline ice, the model density and tensile strength agree with published data for dry compacted snow.

Indirect measurement of tensile strength of hollow fiber braid membranes

Desalination ◽  
2008 ◽  
Vol 234 (1-3) ◽  
pp. 107-115 ◽  
Author(s):  
Myoung Jun Park ◽  
Hern Kim
Keyword(s):  
Tensile Strength ◽  
Hollow Fiber ◽  
Indirect Measurement

Synthesis, Characterization and Properties of Polyesteramides Based on ε-Caprolactone and 6-Aminocaproic Acid

2011 ◽  
Vol 287-290 ◽  
pp. 1538-1547 ◽  
Author(s):  
Yi He ◽  
You Ru Du ◽  
Xiao Bo Liu
Keyword(s):  
Tensile Strength ◽  
Tensile Testing ◽  
Aminocaproic Acid ◽  
Amide Bond ◽  
Ester Bond ◽  
Degradation Temperature ◽  
Melt Polycondensation ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Thermal Degradation Temperature

Biodegradable aliphatic polyesteramides were synthesized from ε-caprolactone and 6-aminocaproic acid by melt-polycondensation method. FTIR, 1H-NMR, DSC, WAXD, TG, and tensile testing were used to characterize the polyesteramides. With the increase in 6-aminocaproic acid content, the melting temperature, thermal degradation temperature and tensile strength at break increased accordingly. The ester bond decomposes at lower temperature, and then the amide bond decomposes at higher temperature.

Preparation of heavy-section ductile iron with improved mechanical properties through quenching and tempering

2020 ◽  
Vol 111 (5) ◽  
pp. 385-391
Author(s):  
Lifeng Tong ◽  
Qingchuan Zou ◽  
Jinchuan Jie ◽  
Tingju Li ◽  
Zhixin Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ductile Iron ◽  
High Strength ◽  
Iron Matrix ◽  
Heavy Section ◽  
Pearlite Content ◽  
Higher Temperature ◽  
Quenching And Tempering ◽  
Tempering Time

Abstract In order to prepare heavy-section ductile iron with high strength and excellent elongation, a series of quenching- tempering experiments was conducted. A relationship between quenching-tempering time and temperature and the contents of martensite and pearlite was established by adjusting different quenching mediums and process parameters, and different microstructures in the iron matrix led to different mechanical properties. The content of martensite in the iron matrix reached over 94% after quenching at 880°C or a higher temperature. Further, the pearlite content could reach over 91% after tempering at 570°C or a higher temperature, thus resulting in improved mechanical properties. The investigated ductile iron yielded mechanical properties of a tensile strength of 970 MPa and an elongation of 6% after quenching in water at 880°C and tempering at 570°C. This will provide more possibilities for the application of heavy-section ductile iron parts.

EVOH-based nanocomposites prepared by simple saponification method

2011 ◽  
Vol 30 (11) ◽  
pp. 932-944 ◽  
Author(s):  
Sang Shin Lee ◽  
Kyu Ryn Kim ◽  
Sien-Ho Han ◽  
Yeun Sug Jeong ◽  
Mal-Nam Kim ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Antibacterial Activity ◽  
Shake Flask ◽  
Crystallization Peak ◽  
Elongation At Break ◽  
E Coli ◽  
Higher Temperature ◽  
Poly Ethylene ◽  
Nanocomposite Powders ◽  
Melting And Crystallization

The nanocomposite powders of poly(ethylene-co-vinyl alcohol)/Na+-montmorillonite (EVOH/MMT) and EVOH/Loess were prepared by a solution-precipitation and saponification method. EVA/toluene/nanoclay suspensions were precipitated and saponified in ethanol/KOH solution in a heterogeneous manner. Tensile properties, morphology, and thermal behavior of the prepared nanocomposites have been evaluated using UTM, SEM, and DSC, respectively. The tensile strength and elongation at break of EVA/MMT-50% and EVA/Loess-50% nanocomposites were significantly increased up to 1 h saponification time and thereafter gradually decreased. At 1 h saponification time, the tensile strength of EVA/ Loess-50% nanocomposite was increased by 5.4-fold to 14.7 MPa, whereas EVA/MMT-50% increased the tensile strength by 2.2-fold to 10.4 MPa compared to the un-saponified one. With the increase in saponification time, melting and crystallization peak temperature of both nanocomposites was shifted at a higher temperature. The antibacterial activity of saponified EVA/MMT-50% and EVA/Loess-50% powders was also determined by shake flask test against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Among the nanocomposites used in this study, EVA/MMT-50%-6 h exhibited strong antibacterial activity against the two kinds of bacteria.

Starch-Chitosan Blend Films Prepared by Glutaraldehyde Cross-Linking

2011 ◽  
Vol 415-417 ◽  
pp. 1626-1629 ◽  
Author(s):  
Feng Hong Li ◽  
Yan Ming Chen ◽  
Liang Li ◽  
Xiao Lin Bai ◽  
Shu Li
Keyword(s):  
Tensile Strength ◽  
Corn Starch ◽  
Crosslinking Agent ◽  
Endothermic Peak ◽  
Water Evaporation ◽  
Solvent Evaporation Method ◽  
Scanning Calorimetry ◽  
Blend Films ◽  
Dsc Studies ◽  
Higher Temperature

The present study evaluated the properties of the polymeric blend films obtained from chitosan and corn starch using glutaraldehyde as crosslinking agent and glycerol as plasticizer by the casting/solvent evaporation method. Fourier transform infrared (FTIR) analyses confirmed that the groups interactions of starch and chitosan in starch-chitosan blend films were present especially when using glutaraldehyde as crosslinking agent. Differential scanning calorimetry (DSC) studies revealed an endothermic peak of starch film at 98 oC corresponding to water evaporation. DSC also indicated that the endothermic peak of blend films moved to higher temperature with adding chitosan and glutaraldehyde compared with native corn starch film. The tensile strength of the blend films increased with the increasing content of glutaraldehyde. The starch-chitosan blend films exhibited the highest tensile strength of 11 MPa when the content of starch was 9% (w/v in water), glutaraldehyde content was 1.0 mL, chitosan ratio is 0.35 (wchitosan/wstarch), glycerol ratio was 0.35 (wglycerol /wstarch).

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