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The specific parameters of materials are shown in Table 1.
Journal of Mechanical Engineering, 2016, 52(13):68-73
Acoustic Locally Resonant Materials [J].
Science 2000, 289, 1734-1740
Journal of Applied Physics, 2011, 110(12):204-208

Materials of Protective Fabrics Development of the synthetic textile products provides novel materials for the protective fabrics [8].
As one of the first product in the synthetic materials, nylon is widely used in the industry which is made of polyamide [12].
Lu, Energy absorption of structures and materials.
Institute of Materials, Lightweight ballistic composites military and law-enforcement applications.
Laible, Ed., Ballistic materials and penetration mechanics.

But in many engineering materials, inclusions are formed in the process of production.
Until now few people have investigated indentation behavior of materials with inclusions.
Sinha: Materials Science and Engineering A Vol.513–514 (2009), p. 389 [4] W.H.
Yue: Materials Science and Engineering A Vol. 527 (2010), p.4519 [7] H.
Li: Micromechanics of Advanced Materials (1995), p. 367 [8] X.

The energy-absorption behaviour of composite materials is affected by a number of factors.
Fibre reinforced composite materials are governed by the fibre material, matrix material, fibre orientation and form.
Materials Preparation Specimen preparation plays a crucial role in determining test results.
Meduri, Composite Science and Technology, 61(2001) 1429-1436
Yu, Energy Absorption of Structures and Materials, Woodhead Publishing, (2003) 317.

Different materials have different characteristics and so can bring different effects on penetration course of the projectile.
For this phenomenon, it could be explained that rock materials had anisotropic and brittle characteristics which caused forming and developing of the cracks in the rock were random when the rock materials underwent impact loads, which could be furthermore proved from damage morphology of the rock layer in Fig. 4.
(2) Different materials could bring different effects on penetration course of the projectile.
[3] Liang Zeng, Weili Wang, and Jianfang Zhu: Journal of PLA University of Science and Technology, Vol.8, No.5(2007), p. 501
[7] Jinze Bai: Beijing: Science Press(2005), p. 101

Enough care has to be taken to select appropriate electrode material and diameter to achieve the desired spot size.
Lai4 “Study of resistance spot weldability of a new stainless steel” journal of Science and Technology of Welding and Joining 2019, Vol. 24, no. 2, 101–111 [12] A.
Doos3 “The Spot Weldability of Carbon Steel Sheet”, Advances in Materials Science and Engineering Volume 2013, Article ID 146896, 6 pages Hindawi Publishing Corporation
Asgari3 International Journal of Advanced Manufacturing Technology (2017) vol 89: 1853–1863 © Springer-Verlag London 2016
[17] Abhishek Tyagi a, Gaurav Kumar a, Mukesh Kumar a, Eram Neha b, Mohd Atif Wahid “Experimental investigation for optimization of robot spot welding parameters on low carbon steel JSC 590RN” Journal of Materials Today Proceedings 2214-7853/_2021 Elsevier publications.

Materials and Methods Seed sludge The seed sludge used in this study was obtained from Wen Chang wastewater treatment plant in Harbin.
International Journal of Hydrogen Energy, 2010; 35(1):81-92
International Journal of Hydrogen Energy, 2010 35(1):81-92 [6] Y.
Journal of Hazardous Materials, 2010, 17(1-3):682-688 [7] N.Q.
International Journal of Hydrogen Energy, 2008;33:1573-1578

In the future, more areas would be explored to optimize the control of cognitive load in virtual maintenance training such as the training materials, more scientific measurement methods.
Gu: Journal of System Simulation, Vol. 18 (2006) 8, p.2195.
Dou: Journal of the Academy of Equipment Command & Technology.
Sweller: Journal of Educational Psychology, Vol. 88 (1996), p.49
Stanton: Issues in Ergonomics Science, Vol. 3 (2002) No. 2, p.178

Next, the JMatPro software was employed to calculate material properties of 15B22 boron steel at various elevated temperatures, including material mechanical properties and thermal properties.
The 15B22 boron steel and SKD61 tool steel were selected as the materials for sheet specimen and dies, respectively.
Acknowledgements The authors wish to thank the National Science Council of Taiwan for the grant under project #NSC102-2622-E-006-032, which makes this research possible.
Azushima, Development of tribo-simulator for hot stamping, Journal of Materials Processing Technology. 210 (2010) 456-460
Liao, Effect of oxide scale on temperature-dependent interfacial heat transfer in hot stamping process, Journal of Materials Processing Technology. 213 (2013) 1475-1483.

Impermeability of Sulphoaluminate Cement Mortar Modified by Redispersible Polymer Powders Zhengmao Ye1, a, Wen Chen1,b and Xin Cheng2,c 1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070,China 2 School of Materials Science and Engineering, University of Jinan, Jinan 250022, China amse_yezm@163.com, bchenw@mail.whut.edu.cn, cchengxin@ujn.edu.cn Keywords: Redispersible polymer powders; Sulphoaluminate cement; Impermeability Abstract.
In some cases, various internal and external factors may cause the durability of cement materials decreased, and cause the structures of concrete damaged even disastrous accidents[1].
Impermeability is the one of performance indexes of durability of cement materials.
Experimental program Raw materials Sulphoaluminate cement with 42.5 grade from Jining Jinlucheng Company was used.
[2] Peiming Wang, Qi Xu and Stark:Journal of Build Material (In Chinese) Vol.4(2001), p. 1