The compressive property of a fiber‐reinforced resin beetle elytron plate and its influence mechanism

2021 ◽  
pp. 50692
Author(s):  
Jinxiang Chen ◽  
Shengchen Du ◽  
Longcheng Pan ◽  
Ning Hao ◽  
Xiaoming Zhang ◽  
...  
Keyword(s):  
Compressive Property ◽  
Fiber Reinforced ◽  
Influence Mechanism

Study on Strength Influence Mechanism of Fiber-Reinforced Expansive Soil Using Jute

2016 ◽  
Vol 34 (4) ◽  
pp. 1079-1088 ◽  
Author(s):  
Wang Yixian ◽  
Guo Panpan ◽  
Shan Shengbiao ◽  
Yuan Haiping ◽  
Yuan Binxiang
Keyword(s):  
Expansive Soil ◽  
Fiber Reinforced ◽  
Influence Mechanism

Experimental Study and Influence Mechanism of the Properties of α-C:H Thin Film at Different Bias Voltages

2013 ◽  
Vol 421 ◽  
pp. 217-221
Author(s):  
Bin Bin Yu ◽  
Jun Tang Yuan ◽  
Zhen Hua Wang ◽  
Lei Huang
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Bias Voltage ◽  
Physical Vapor Deposition ◽  
Ion Source ◽  
Compressive Property ◽  
Ball Mills ◽  
Atomic Force ◽  
Influence Mechanism ◽  
Amorphous Hydrogenated Carbon

Amorphous hydrogenated carbon (α-C:H) thin films were deposited by the linear ion source (LIS)-physical vapor deposition (PVD) at the bias voltages ranging from 0V to-1500V. The characteristics such as surface topography and mechanism properties of the film were investigated under the voltage of 0V, -500V, -1000V and-1500V by using atomic force microscope (AFM), Ball Mills and Rockwell Indentation Tester. The results showed that with the increase of the bias voltage, the surface roughness of the film decreased initially and then increased. The wear resistance and compressive property were continuously improved. When the bias voltage was-1000V, the surface roughness was the lowest of 5.78nm.When the bias voltage went to-1500V, the film had the lowest wear rate of 7.8E-8 and the best compressive property. As a result, deeply understanding the effect mechanism of the bias voltage on α-C:H thin film is meaningful for the future deposition.

TEM characterization of reaction zone in a SiC fiber-reinforced titanium alloy

1988 ◽  
Vol 46 ◽  
pp. 738-739
Author(s):  
G. Das ◽  
R. E. Omlor
Keyword(s):  
Titanium Alloys ◽  
Reaction Zone ◽  
Carbon Layer ◽  
Fiber Reinforced ◽  
Reaction Products ◽  
Sic Fibers ◽  
Sic Fiber ◽  
The Matrix ◽  
Immense Potential

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

The role of serotoninergic brain structures in neurotensin influence mechanism on defensive behavior in rats

2007 ◽  
Author(s):  
N. P. Shugalev ◽  
A. V. Stavrovskaja ◽  
S. Olshanskij ◽  
G. Hartmann ◽  
L. Lenard
Keyword(s):  
Defensive Behavior ◽  
Brain Structures ◽  
Influence Mechanism
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