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On Stress Concentration Factor of Perforated Plate Filling with Different Materials Zhao Weiping1, a, Yi Cheng1,b 1China University of Mining and Technology, Beijing 100083, China aweipingzhao163@163.com, byicheng312@tom.com Keywords: Stress concentration factor, Elasticity, Compound plate, Finite element method Abstract.
Stress concentration may cause fatigue cracks and static fracture in structure components made of brittle materials.
Conclusions This paper presents a new method to calculate the stress concentration factor of composite materials. and a comparison with numerical simulations has proven the reliability of the proposed method.
Sun: Fatigue fracture properties of steel fiber reinforced concrete and engineering applications (Science Press, China 2003)
Li: Journal of China University of Mining & Technology Vol. 37, p, 450

The deposited material was IN625 and the substrate material was AISI 316.
Klimova-Korsmik, Quality management of metal products prepared by high-speed direct laser deposition technology, Key Engineering Materials 684 (2016) 461-467
DebRoy, An improved prediction of residual stresses and distortion in additive manufacturing, Computational Materials Science, 126 (2017) 360-372
Zhang, Additive manufacturing of metallic components – process, structure and properties, Progress in Materials Science, 92 (2018) 112-224
Poprawe, Laser additive manufacturing of metallic components: materials, processes and mechanisms, International materials reviews 57, 3 (2012) 133-164

In addition, black semiconducting solids are obtained as fine powders and silvery materials as a larger crystals [8].
After deposition the samples, the obtained materials are annealed at different temperatures, which are (375,450)K for about one hour.
“Deposition of Metal Chalcogenide Thin Films by Successive Ionic Layer Adsorption and Reaction (SILAR) Method” Bulletin Material Science, 27(2) (2004): 85-111
Journal of Science and Technology, 10(2) (2018): 53-60
Mokhov, "Progress in the growth and research of crystals for wide-gap semiconducting materials."

A metal cavity filled with absorber materials was used to obtain the unidirectional radiation patterns and its height was 30 millimeters.
For example, in [1], a novel sine-wave meander Archimedean spiral antenna is presented, and addition of sine-wave into Archimedean helix will prolong the electrical length of an antenna arm with a given radius of helix，which will enhance antenna miniaturization and maintain excellent radiation property of Archimedean spiral antenna．In [2], a hybrid backed-cavity with electromagnetic band-gap (EBG) structure and a perfect electronic conductor (PEC) is proposed for an Archimedean spiral antenna, and this cavity makes the spiral antenna work operate over the 10:1 bandwidth and without the loss introduced by absorbing materials that are used conventionally to broadband spirals.
Journal of microwaves,　2009, 25(2):53-57
Chinese Journal of Radio Science, 2005, 20(6):699-702
Journal of Shanghai University (Natural Science), 2008, 14(6):581-584.

Lately, there has been growing interest in finding sustainable, effective, and biodegradable materials, such as plant fibres, for composite reinforcement [1].
Materials and Methods 2.1 Fibre Extraction The Newbouldia L. plant was sourced from Enugu State in Nigeria.
Bala, Physical and mechanical properties of flax fibre and its composites: A Review, Journal of Material Sciences and Engineering. 10 (2022) 015
Baetens, Thermal and mechanical properties of flax fibers as potential composite reinforcement, Macromolecular Materials and Engineering. 286(6) (2001) 342-349
Ali, Tensile mechanical performance of natural/natural fiber reinforced hybrid bio-composite materials – A statistical approach, Journal of Industrial Textiles, 54 (2024) 1-31.

Fire-fighting science and technology, Vol. 3 (1991), p. 24 (In Chinese) [4] S.
Journal of basic science and engineering, Vol. 19 (2011), p. 288 (In Chinese) [8] Jialei Tan, Tong Wang and Ruowen Zong.
Journal of safety science and technology, Vol. 5 (2009), p. 37 (In Chinese) [9] J.
Spill Science & Technology Bulletin.
Journal of Hazardous Materials, Vol. 140 (2007), p. 361 [14] Ibrahim M Shaluf, Salim A Abdullah.

Preparation and Antibacterial properties of Nano-hydroxyapatite / Quaternary ammonium salt composite Material Huifang Yang1, a, Renshu Ren1,b ,Huang Li1,c and Zhifang Li1,d 1School of Material science and engineering,Shijiazhuang Tiedao University, Shijiazhuang,050043,China a yhf989@sina.com, b ren-shu-xia@163l.com, cLi huang@163.com, d zhifangli@163.com Keywords: hydroxyapatite, ammonium salt, antibacterial properties, heat resistance.
The composite material has excellent antimicrobial property, the diameter of bacteriostatic ring equaling to 9mm, when adding 5.7% Quaternary ammonium salt into Nano-hydroxyapatite at the 120℃ for 1 hour, and when the heat temperature is 200°C, the diameter of bacteriostatic ring were more than 7mm, which demonstrate the composite agent still has a certain of antimicrobial property and good the heat resistance.
Journal of Taiyuan University of Technology, 34 (2003), p11, in Chinese [2] Songhong, xia ying,chenli,et al.
Journal of Functional Materials, 3(2007), p2573, in Chinese [6] Light Industry Standard of the People's Republic of China QB/T 2738-2005.

It was also limited by the specific materials simulated in that work.
Sciences Press, Beijing, (2006)
ASME Journal of Tribology, 129, 4(2007), pp.957-962
ASME Journal of Tribology, 126, 1(2004), pp.34-40
Applied Mechanics and Materials Vol. 29-32 (2010), pp.332-336.

Fig.1 schematic diagram of SBR Materials A synthetic wastewater mainly consists of glucose and ammonium chloride.
H., Activated sludge nickel toxicity studies [J]., Journal of Water Pollution Control Federation, 1981,53, 1314-1322.
Journal of Hazard Material, 2008, 151(1) : 185-193
Journal of Biotechnology, 2002, 95(3): 249-256
Journal of Hazardous Materials, 2004, 106B:83-92

Advanced Materials, 2013, 25(36)
Materials & Design (1980-2015), 2013, 52: 638-647
Materials & Design, 2017, 128: 98-111
Materials & Design, 2019, 164: 107553
Modelling and Simulation in Materials Science and Engineering, 2017, 25(6): 065002