The Mechanical Property of CFRP Laminates with Voids

2013 ◽  
Vol 652-654 ◽  
pp. 25-28 ◽  
Author(s):  
A Ying Zhang ◽  
Dong Xing Zhang
Keyword(s):  
Mechanical Property ◽  
Exponential Function ◽  
Bending Strength ◽  
Empirical Models ◽  
Cfrp Laminates ◽  
Evolution Laws

The effects of voids on the bending strength and ILSS of CFRP laminates were discussed in this paper. The bending strength and ILSS of specimens decreased with the porosity increasing from 0.33% to 1.50%. The empirical models of the bending strength and ILSS of CFRP laminates with different porosities are established by using ORIGIN software. The evolution laws of the bending strength and ILSS with different porosities were corresponding to the form of exponential function.

The Static Mechanical Properties of Carbon/Epoxy Composite Laminates with Voids

2013 ◽  
Vol 652-654 ◽  
pp. 29-32
Author(s):  
A Ying Zhang ◽  
Dong Xing Zhang
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Empirical Models ◽  
Compressive Properties ◽  
Cfrp Laminates ◽  
Static Mechanical ◽  
Evolution Laws ◽  
Static Mechanical Properties

The effects of voids on the tensile and compressive properties of CFRP laminates were discussed in this paper. The tensile and compressive strength of specimens decreased with the porosity increasing from 0.33% to 1.50%. The empirical models of the tensile strength and the compressive strength of CFRP laminates with different porosities are established by using ORIGIN software. The evolution laws of the tensile strength and the compressive strength with different porosities were corresponding to the form of exponential function.

Effects of TiN Content on Mechanical Properties and Microstructure of ATN Materials

2013 ◽  
Vol 589-590 ◽  
pp. 590-593 ◽  
Author(s):  
Min Wang ◽  
Jun Zhao
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Fracture Toughness ◽  
Vickers Hardness ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Hot Press ◽  
Hot Press Sintering ◽  
Tin Content

In order to investigate the effects of TiN content on Al2O3/TiN ceramic material (ATN), the ATN ceramic materials were prepared of TiN content in 30%, 40%, 50%, 60% in the condition of hot press sintering. The sintering temperature is 1700°C, the sintering press is 32MPa, and the holding time are 5min, 10min, 15min. The effects of TiN content on mechanical properties and microstructure of ATN ceramic materials were investigated by analyzing the bending strength, hardness, fracture toughness. The results show that ATN50 has the best mechanical property, its bending strength is 659.41MPa, vickers hardness is 13.79GPa, fracture toughness is 7.06MPa·m1/2. It is indicated that the TiN content has important effect on microstructure and mechanical properties of ATN ceramic materials.

Aggregate Grading and Mechanical Property Study on Particulate-Reinforced Composite

2011 ◽  
Vol 225-226 ◽  
pp. 13-16
Author(s):  
Jian Xiong Xie ◽  
Zhe An Lu
Keyword(s):  
Mechanical Property ◽  
Quartz Sand ◽  
Bending Strength ◽  
Composite Resin ◽  
Resin Content ◽  
Aggregate Gradation ◽  
Reinforced Composite ◽  
The Cost ◽  
Particle Reinforced Composite ◽  
Particulate Reinforced

The aggregate gradation and mechanical property of particle reinforced composite (resin and quartz sand composite ) were studied with test, the results show that: The more optimal scheme of aggregate gradation can be obtained with right ratio of larger particle quartz sand and small particle quartz plate , which can make the gradation resin content from the original 20% ~ 25% reduced to 12% ~ 14%, so as to reduce the cost and improve the economic benefit and guarantee bending strength of winding layer not decrease in the meantime

Influence of Injection Conditions on the Mechanical Property of MWCNTs/ PC Nanocomposites

2014 ◽  
Vol 983 ◽  
pp. 94-98 ◽  
Author(s):  
Li Jun Wang ◽  
Jian Hui Qiu ◽  
Eiichi Sakai
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Mechanical Property ◽  
Bending Strength ◽  
Surface Hardness ◽  
Interfacial Interaction ◽  
Multiwalled Carbon ◽  
The Matrix ◽  
The Impact ◽  
Scanning Electron

The melting mixing was applied in the preparation of Multiwalled carbon nanotubes/Polycarbonate (MWCNTs/PC) nanocomposites. MWCNTs/PC nanocomposites with different MWCNTs contents were prepared under different injection conditions. The mechanical property of nanocomposites was comparatively investigated. The results demonstrated that: the tensile property of the nanocomposites was slightly improved by MWCNTs content increasing; but as the MWCNTs contents went on to increase to 10wt%, the tensile strength and bending strength were obviously decreased about 35% and 47%, respectively, but the impact strength and hardness were increased. The center hardness of MWCNTs/PC nanocomposites was greater than the surface hardness. Besides, the changes on the mechanical properties of the nanocomposites were studies by changing the injection conditions. By Scanning Electron Microscopy (SEM) observation, the microstructure and morphology of nanocomposites were analyzed, revealing that the center of the nanocomposite distributed more MWNTs, and the injection conditions would affect the MWNTs’ dispersion in the matrix and the interfacial interaction between MWCNTs and PC.

Study on Characteristics and Principium of Rare Earth Carbide Tools

2006 ◽  
Vol 532-533 ◽  
pp. 101-104
Author(s):  
Tie Fu ◽  
Qi Xun Yu ◽  
Si Qin Pang
Keyword(s):  
Mechanical Property ◽  
Fracture Toughness ◽  
Rare Earth ◽  
Electron Probe ◽  
Bending Strength ◽  
Testing Machine ◽  
Materials Testing ◽  
Electron Probe Microanalyser ◽  
Re Elements ◽  
Scanning Electron

Carbide tools play key roles in present machine manufacture. The mechanical property and cutting performance of carbide tools are improved obviously when adding micro rare earth (RE) elements into carbide tools. By means of some apparatus, such as materials testing machine, Scanning Electron Microscope (SEM), dynamometer, microscope and electron probe microanalyser, the traditional and RE carbide tools, P30 (YT5 and YT5R), P20 (YT14 and YT14R), M10 (YW1 and YW1R), K30 (YG8 and YG8R), are studied and compared by doing a lot of experiments. These experiments show that the bending strength, fracture toughness and anti-impact capability of RE carbide tools are improved remarkably, and their hardness increased a little. Moreover, the cutting force, tool-chip friction coefficient and wear of RE carbide tools decreased in cutting. In addition, the effect and cutting principium of RE element to carbide tools are analyzed and discussed, which is beneficial to the research and application of RE carbide tools.

Densification and Mechanical Property of Nanostructured NiAl Produced by Mechanical-Alloying and Spark-Plasma Sintering

2004 ◽  
Vol 449-452 ◽  
pp. 1101-1104 ◽  
Author(s):  
Ji Soon Kim ◽  
S.-H. Jung ◽  
Young Do Kim ◽  
Chung Hyo Lee ◽  
Young Soon Kwon
Keyword(s):  
Mechanical Property ◽  
Crystallite Size ◽  
Spark Plasma Sintering ◽  
Bending Strength ◽  
Rupture Strength ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Nial Phase ◽  
Ni3al Phase ◽  
Spark Plasma

Mechanically-alloyed NiAl powder was sintered by Spark-Plasma Sintering (SPS) process. Densification behavior and mechanical property were determined. Above 97% relative density was obtained after sintering at 1150oC for 5min. Crystallite size determined by the Scherrer method was approximately 80 nm. TEM observation revealed a relative larger crystallite size. X-ray diffraction analysis showed that the sintered bodies were composed mainly of NiAl phase together with Ni3Al phase. Sintered NiAl body showed an average Vicker’s hardness of 555Hv, transverse-rupture strength of 1393MPa, 4-point-bending strength of 1100MPa, and fracture toughness of 19.9MPa m-1/2

Mechanical Property of Hybrid Steel Fiber Reinforced Cement-Based Composites

2013 ◽  
Vol 539 ◽  
pp. 99-102
Author(s):  
Hai Tao Tan ◽  
Wu Yao ◽  
Xiao Ming Song ◽  
Shuai Dong
Keyword(s):  
Mechanical Property ◽  
Fracture Energy ◽  
Fiber Volume Fraction ◽  
Ultimate Load ◽  
Bending Strength ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Reinforced Cement

The ultimate load, fracture energy and equivalent bending strength of hybrid steel fiber reinforced mortar were investigated with a constant fiber volume fraction in this paper. The results showed that ultimate load of hybrid steel-fiber reinforced mortar was higher than that of mono-fiber reinforced mortar; fracture energy and equivalent bending strength increased with the volume fraction of steel fiber with end hooks.

scholarly journals A Simple Effective Flaw Model on Analyzing the Nanofiller Agglomeration Effect of Nanocomposite Materials

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Arun Krishnan ◽  
L. Roy Xu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Bending Strength ◽  
Volume Fraction ◽  
High Volume ◽  
Nanocomposite Materials ◽  
Strength Reduction ◽  
Experimental Investigations ◽  
Agglomerate Size ◽  
Agglomeration Effect

A special mechanics/material phenomenon involving nanocomposites is the agglomeration of nanofillers at high volume fractions of nanofillers. Numerous experimental investigations on nanocomposites have indicated a significant decrease in mechanical properties, due to the agglomeration of nanofillers. This paper describes a simple effective flaw model to correlate the local mechanical behavior of agglomerated nanoparticles with the change in global strengths of nanocomposites. The estimated bending strength reduction from our model is shown to be similar to experimental results reported by previous researchers. These results can be used as a guide for future nanocomposite design and development. Future nanomaterial manufacturing should be focused on eliminating the largest agglomerates, rather than limiting the nanofiller volume fraction. Meanwhile, by reducing the nanofiller agglomerate size, we expect that a high critical nanofiller volume fraction could be obtained to delay the mechanical property reduction.

Structure-Mechanical Property Relationships In A Biological Ceramic-Polymer Composite: Nacre

1991 ◽  
Vol 255 ◽  
Author(s):  
Katie E. Gunnison ◽  
Mehmet Sarikaya ◽  
Jun Liu ◽  
Ilhan A. Aksay
Keyword(s):  
Mechanical Property ◽  
Bending Strength ◽  
Organic Matrix ◽  
High Energy ◽  
Primary Component ◽  
Interfacial Structure ◽  
Interfacial Region ◽  
Toughening Mechanisms ◽  
Brick And Mortar ◽  
High Energy Absorption

AbstractThe structure-mechanical property relationships were studied in nacre, a laminated ceramicpolymer biocomposite found in seashell. Four-point bending strength and three-point bend fracture toughness tests were performed, and the results averaged 180 ± 30 MPa and 9 ± 3 MPa·m1/2, respectively, indicating that the composite is many orders of magnitude stronger and tougher than monolithic CaCO3,, which is the primary component of nacre. Fractographic studies conducted with a scanning electron microscope identified two significant toughening mechanisms in the well-known “brick and mortar” microstructure of nacre: (i) sliding of the aragonite platelets and (ii) ligament formation in the organic matrix. These toughening mechanisms allow for high energy absorption and damage tolerance and thereby prevent catastrophic failure of the composite. The structure of the organic matrix and the interfacial structure between the organic and inorganic components were studied with transmission electron microscopy by using both ion milled and ultramicrotomed sections with and without the intact aragonite platelets. We found that the organic matrix is indeed a multilayered composite at the nanometer scale but is thinner (about 100 Å) than reported in the literature. The morphology of the interfacial region between the organic and the inorganic layers suggests the presence of a structural “transitory” region that interlocks the two dissimilar phases.

Effect of CNTs on Property of Calcium Phosphate Cement

2007 ◽  
Vol 336-338 ◽  
pp. 1606-1608 ◽  
Author(s):  
Ping Zhao ◽  
Kang Ning Sun ◽  
Tai Rong Zhao ◽  
Xue Hua Ren
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Calcium Phosphate ◽  
Ball Milling ◽  
Calcium Phosphate Cement ◽  
Bending Strength ◽  
Cement Composite ◽  
Composite Powders ◽  
The Core ◽  
Hydroxyapatite Crystals

The effect of carbon nanotubes (CNTs) on bending strength of calcium phosphate cement was investigated. The cement composite powders, containing 0, 0.2%, 0.4%, 0.6%, 0.8% and 1.0wt% CNTs respectively, were prepared by ball milling. It was found that the presence of CNTs improved the bending strength of the cement from 6.6 MPa to the best 10.5 MPa. The reason for mechanical property improvement is related to the fibers (bars)-like microstructure of the reinforcing element, with CNT in the core and hydroxyapatite crystals growing on it.

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