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The model widely used in the fatigue crack growth study in materials science and fracture mechanics is the Paris-Erdogan, which relates the stress intensity factor with the subcritical crack growth, under a fatigue regime.
Key Engineering Materials, 664, 96–103
SN Applied Sciences, v. 2, n. 7, p. 1-8, 2020
[8] American Society For Testing And Materials.
Applied Mechanics and Materials, 851, 317–321

The silicate / cement based composites is a group of materials which consist of silicate / cement paste matrix and e.g. sandstone, granite or basalt aggregate.
Eigenvector for both materials then form one joint eigenvector vk=vk0,vk1.
The authors would like to thank the Czech Science Foundation for financial support through the Grant 16/18702S.
L., Pasadena, C., Journal of Applied Mechanics 24 (1957) 109-114 [2] Knésl, Z., International Journal of Fracture, 1991, 48: (4) R79 – R83 [3] Hein, V.
S., International Journal of Engineering Science 12 (1974) 107-120

That is, to individual material, materials chosen, but also for an entire industry.
Journal of Cleaner Production, Vol.10 (2002) p.197-214
Journal of Cleaner Production, Vol.8 (2000) p.243-254
Leiden: Centre of Enrionmental Science, Leiden University, 1992
Journal of Industrial Ecology, Vol.10 (2006) p.61-77

Such materials can replace metal reflecting screens.
Radioabsorbing materials based on nanostructures.
Electronics: Science, Technology, Business. 1 (2010) 92–95
Russian Physics Journal. 8 (2008) 874–876
Russian Physics Journal. 8 (2013) 970-976

It was first created by NEMA from the basic materials in 1968 [16].
To analysis the variation of S11-parameter by changing the substrate materials which have permittivity almost near to FR-4, a comparison is shown in Fig. 6.
Table 3 shows the list of the materials used in the comparison.
Table 3: Dielectric properties of different substrate materials Substrate Materials Relative Permittivity Loss tangent Rogers TMM 4 (tm) 4.5 0.002 Arlon AD450 (tm) 4.5 0.0035 FR-4 4.6 0.02 Bakelite 4.8 0.002 Fig. 6.
Misran, "Dual polarized microstrip patch antenna for Ku-band application," Informacije MIDEM-Journal of Microelectronics Electronic Components and Materials, vol. 41, pp. 114-117, 2011

Materials Science Forum Vols. *** (2004) pp.59-62 online at http://scientific.net  2004 Trans Tech Publications, Switzerland Ultrasonic Machining Mechanism of Sintered Nd-Fe-B Magnetic Materials J.H.
The material removal mechanism of ultrasonic machining sintered Nd-Fe-B magnetic materials was studied theoretically.
Lin: Journal of Research On Metal Materials Vol. 15 (1994), p. 70 [2] D.W.
Yang: Journal of Mechanical Engineering Materials Vol. 19 (1995), p. 43 [3] Z.F.
Tietz: Journal of Materials Science Vol. 25 (1990), p. 3731.

Fiber Materials AC Impedance Spectroscopy and Its Application Xiaofeng Li 1,a ，Xianggao Pan 1,b 1Hunan University of Arts and Science, Changde, Hunan, China 415000 a lxfyb@21cn.com, b pxg987654321@163.com Keywords: AC impedance Spectroscopy, Bathtub effect, fibrous material, moisture regain ratio.
This article presents a recent study on the behavior of impedance versus frequency of fiber materials.
To eliminate the faults of DC impedance technique in measuring fiber moisture regain, this paper proposed a novel technique to test moisture regain of fiber materials by way of testing AC resistance.
Tong: Journal of the Chinese Cereals and Oils Association.
Chen. : Journal of Zhejiang University (Engineering Science), Vol.39(2005),P.1152

Introduction According to their excellent characters, porous materials have been applied in many areas such as medical biotechnology, physical shock resistance, pollution absorbing and so on[1-2].
For example, the gas-lubricated journal bearing has been devised to optimize the traditional oil bearing by its neatness , cheaper raw material, better capacity and other advantages[3-7].
Like the gas-lubricated journal bearing, if a inclined plate with certain length and width slides on the surface of a soft porous material with relatively high velocity, the porous material will respond to it with big resistance force due to the air pressure inside the material, and the condition is that the sidewall must be sealed to prevent air leakage.
Conclusion In this paper, we propose a new thought of utilizing the aerodynamics to decrease the fuel consumption of the vehicles which run on the high way or overhead road laying with the specific tracks made of porous materials.
[5] Wang-Long Li: Journal of Tribology Vol. 121(1999), p. 823

The presented articles consider a wide range of nanoscale materials forms: nanopowders, nanoparticles and nanofibers.
We hope this collection will be useful and interesting to many researchers and engineers in modern materials science.

The Study of Friction Materials in Brake Pad of Small Electric Car Kunyu Zhao1,a, Wen Jiang1,b, Zhengkun Li2,c, Xinkun Zhu1,d 1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China 2 Faculty of Mechanical and Engineering, Kunming University of Science and Technology, Kunming 650093, China akyzhaoy@sina.com, bjiangwen0730@hotmail.com, c108376047@qq.com, d1123577732@qq.com Keywords: brake pad; friction materials; metal-based; lubrication; hard phase Abstract.
Friction block is composed of friction materials and binders.
In order to solve the problem of price low, short service life, bad performance of automotive brake friction materials, this paper compared the microstructures of two friction materials and provide theoretical basis for seeking suitable friction materials in small electric vehicles.
The phases and the functions in A and B　friction materials．
(in Chinese) [6] Zhongxin Yu, Yalun Huang and Laizhi Wang: Journal of Wuhan Automotive Polytechnic University.