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Procedure and Discussion of Failure Analysis in Iron-steel Materials Wang Zhigang1,a, Shi Ludan1,b,Jing Min1,c, Xu Yong1,d 1School of Materials Science and Engineering, Shandong Jianzhu University, Fengming Road,Jinan 250101, China awangzhigang@sdjzu.edu.cn, bshiludan2337927@126.com, cshandajingm@163.com, dxuyong2612@sdjzu.edu.cn Key words: H13 steel; Hot-forging mould; Failure analysis; Open experiments Abstract.
Introduction The demonstration experiments by teachers are the main way in the current experimental teaching of metal materials major[1-3].
Estreicher: Journal ofSouthwest Agricultural University (Social Scial Science Edition).
Estreicher: Transactions of Materials and Heat Treatment.
Estreicher:Journal of Phase Equilibria.

Fiber materials.
Beijing: China Science and Technology Press, 2005: 2-3 [2] Chen Liemin.
Beijing: China Science and Technology Press, 2001 [3] Chen Liemin, Wo Xiyuan.
Journal of Composite Materials, 2007; 24(1): 1~12 [6] Leng Jinsong, Lanxin, Liu Yanju, etc.
Journal of Aeronautics,2010; 4: 950~956 [7] Song Liqiang,Yang Shimo ,Chen Zhiyuan.Study on Optimization and Application of Mirror Materials of Space Astronomical Instruments[J].Materials Review,2008,22(12)5~9

The article deals with the creation of a mathematical model that can be applied in the testing of various materials.
Static and kinetic coefficient of friction If we consider an example such that we have only the case of two materials, where one material is a base that is fixed and the other test material is placed on it, which is shown in Fig. 1.
Fixed material Testing material F FN FR Fig. 1 Two materials with considered forces In Fig. 2 shows the dependence of the resistance force taking into account the static and kinetic coefficient of friction.
Journal of Mechanical Science and Technology. 24. 1311-1317. 10.1007/s12206-010-0404-6
American Journal of Mechanical Engineering. 1. 10.12691/ajme-1-1-1.

Characterization and Analysis of Materials Morphology Analysis of Materials.
Journal of Power Sources, 171(2007) 953-959
Journal of Power Sources, 170(2007) 210-215
Kang, et al, Progress in Synthesis and Modification of LiFePO4 Cathode Material for Lithium Ion Rechargeable Batteries, Journal of Materials Science& Engineering. 29(2011) 454, 468-470
Jiang, Development and challenge of LiFePO4 cathode materials for Li-ion batteries, Journal of Functional Materials. 41(2010) 365-368

Engineering mechanics is the study of relevant materials and its application in the motion law of the macro science.
Acknowledgements This work was financially supported by the University basic discipline construction - the mechanics of materials and the Shandong provincial high-quality curriculum - the mechanics of materials.
Journal of Changsha Railway University (Social Science), 2004(4) 147-149.
Journal of Luoyang Institute of Technology (Humanities). 2002, 20(4) 89-92.
Journal of Architectural Education in Insitutions of Higher Learning. 2005, 14(1) 62-63.

Experiment Materials.
New Chemical Materials, (5):8-11(1998)
Materials Science and Engineering A, 328:196-200(2002)
New chemical materials, 31(2):42-44 (2003)
International Journal of Food Science and Technology, 36:283-289(2001).

Introduction Bi-materials possess a significant importance due to their extensive applications in manufacturing industry where ductile materials maybe joined to comparatively brittle materials or where physically mismatching materials have to be joined to obtain technical or economical objectives.
The bond strength at the bi-materials interface plays a greater role in assuring the joint reliability.
The model of a bi-material notch is suitable to simulate a number of construction points from which a failure is initiated at the junction of two materials at the free surface.
Fujimoto, Numerical Simulation of Impact Transonic Interfacial Fracture with the Crack Coalescence, Materials Science Forum Vols. 465-466 (2004) pp 61-66, (2004) Trans Tech Publications, Switzerland. 4.
Hadavinia, A cohesive zone global energy analysis of an impact loaded bi-material strip in shear, International Journal of Fracture (2006) 138:197–209. 8.

One of the ideal spinel ferrite materials close to the inverse spinel is cobalt ferrite [4-6].
The mixing of these materials must be in accordance with stoichiometric calculations [24,25].
Shah, Ferrite Materials, Handbook of Magnetic Materials. (2015) 291–379. doi:10.1016/b978-0-444-63528-0.00004-8
Chiriac, Substituted cobalt ferrites for sensors applications, Journal of Magnetism and Magnetic Materials. 320 (2008) e869–e873. doi:10.1016/j.jmmm.2008.04.067
Wilde, Impurity effect on recrystallization and grain growth in severe plastically deformed copper, Materials Science and Engineering: A. 824 (2021) 141786. doi:10.1016/j.msea.2021.141786

Study on the Techniques of Responders Dealing with Hazardouse Materials Accidents Kongsen Wang Chinese people’s armed police force academy, Langfang, Hebei, 065000, China wangkongsen@126.com Keywords: Hazardous, Materials, Accidents, Responder, Techniques Abstract.
This article analyzed the situation of hazardous materials accidents and pointed the basic techniques a fighter dealing with hazardous materials accidents should possess.
These techniques are sure to be useful to responders to hazardous materials accidents.
Personal protection Personal protection is needed in hazardous materials response.
The analysis of domestic serious accidents dangerous chemicals, in: China Safety Science Journal, Beijing 2006, 14 ( 6): 87 ~ 90

Introduction Natural Bamboo Fiber is a renewable Natural Fiber, with good material performance, been thought to be a new kind of green environmental protection materials.
Materials and Methods Raw Material Preparation.
At this time, the properties of materials is the best.
Journal of agricultural engineering, 10(2): 33-36, 2008 [5] Rowell, RM.
The state of art and future development of bio-based composite science and technology toward the 21st century.