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VHCF strength of helical compression springs - Influence of heat treatment temperature before shot peening Isabell Brunner1, a *, Desislava Veleva1, b, Jörg Beyer1, c, Matthias Oechsner1, d 1State Materials Testing Institute Darmstadt, Chair and Institute for Materials Science, Technische Universität Darmstadt, 64283 Darmstadt, Germany abrunner@mpa-ifw.tu-darmstadt.de, bveleva@mpa-ifw.tu-darmstadt.de, cbeyer@mpa-ifw.tu-darmstadt.de, doechsner@mpa-ifw.tu-darmstadt.de, *corresponding author Keywords: Helical compression springs, SiCr-alloyed valve spring steel, very high cycle fatigue test, heat treatment temperature Abstract.
To analyse the influence of different materials and production parameters on the VHCF fatigue strength of helical compression springs, a project was initiated at the Institute for Materials Technology at the Technische Universität Darmstadt [2].
By adjusting production parameters, the reliability of helical compression springs can be improved for a very high number of cycles even for cost-efficient spring wire materials.
Vol. 4, Elsevier Science Pub.
Sonsino, Course of SN curves especially in the high-cycle fatigue regime with regard to component design and safety, International Journal of Fatigue 29, 2007

Test materials and equipment.
During the experiment, installed the clamping devices which were made of different materials on the top and bottom platens, and the stems were clamped by the clamping devices.
Table 1 The Effect of the Friction Force between Clamping Force and Clamping Material Clamping Material Friction Force [N] Clamping Force [N] Friction Force [N] Plastic 21.07 10 22.36 Rubber 40.88 20 34.27 Steel Plate 25.2 30 40.88 Nylon Fiber 16.76 40 62.02 Note: Clamping force was 30N Note: Clamping material was rubber In Table 1, the friction force was the largest when the clamping material was rubber; the friction force was the smallest when the clamping material was Nylon fiber.
Acknowledgement This work was supported by Natural Science Foundation of Guangdong, China (S2011010001933), National Sparking Plan of China (2010GA780049), Principal Fund of South China Agricultural University (2009X004), and National Natural Science Foundation of China (31171457，51175189).
Journal of Agricultural Mechanization Research, Vol. 2(2) (2007), p. 4-7

Erosion Phases in Two Types of Cement Pastes Containing Limestone Exposed to Sulfate Attack Fengchen Zhang a, Yun Zhao b and Fuwan Zhu c College of Mechanics and Materials, Hohai University, Nanjing 210098, China azhangfc67@163.com, b zhaoyun900045@qq.com, c 973199228@qq.com Keywords: thaumasite, ettringite, gypsum,portlandite Abstract.
TSA has more deterioration to all cement-based material than conventional sulfate attack because its target is C-S-H gel.
Cement-based material containing limestone is more susceptible to TSA.
Two bands with frequencies at 670, 499 cm-1 can be observed in 0-1mm layer, which are characteristic of the octahedral [SiO6] groups and indicates the presence of thaumasite because thaumasite is the only mineral containing Si in octahedral coordination[11] in all cement-based materials.
Acknowledgements Financial supports of National Natural Science Foundation of China (51109073), Technology Development project of Northern Jiangsu (BC2013459), and Construction Plan for Science and Technology Infrastructure of Jiangsu Province (BM2013046) are highly appreciated.

In this regard, developing solutions aimed at improving the environmental performance of the aluminum electrolysis due to the use of technogenic raw materials in the fundamental technique or other industries [11-16] is a critical task.
Applied Clay Science. 172 (2019) 146-154
Barauskas, Analysing the chemical composition of man-made materials resultant from the production of primary aluminium in order to find cost-effective recycling techniques.
Tyutrin, Research on leading fluorine from carbon-containing materials of aluminum production.
Journal of Mining Institute. 239 (2019) 544-549

China, 430070 2 School of Material Science and Engineering, Wuhan University of Technology, Wuhan, P.
Jha: Journal of Terramechanics, Vol. 44 (2007), pp.89-94

During the computation, the initial geometric imperfection under mean F0ij is considered, while the geometric and material nonlinearity is also considered under high wind speed.
Acknowledgements The authors gratefully thanks the Research Program of National Science Foundation of China (Project No: 50978063) and Program for New Century Excellent Talents in University (Project No: NCET-09-0082) for the financial supports.
Journal of Tongji University, 1999, 27(2): 136-144

Acknowledgments This research is financially supported by the natural science foundation of Shandong Province (ZR2011DL004), the Opening foundation of State Key Laboratory(LP1115), These supports are greatly appreciated.
Journal of Applied Mechanics, 1980, 47: 613-619
Material mechanics.

In order to promote the development of economy, many local governments invest a lot of manpower and material resources, financial resources to the development of tourism industry, but did not achieve the ideal outcome. [4]Therefore, we need to study the various factors affecting and restricting factors of tourism industry.
Journal of Computer Science and Technology, 2004, 19(3):257-259

(2) The stress-strain relations for isotropic material are ， ，
Journal of Mathematical Sciences.Vol.165(2010) p.342-354

Synthesis of Bulk Metal Matrix Nano Composites by Full Cavitation Solidification Method Payodhar Padhi1a, Biranchi Narayan Dash1b Pragyanparamita Mohanty2b B.K.Satapathy3c& Sachikanta Kar4d 1Department of Mechanical Engineering, Konark Institute of Science & Technology, Bhubaneswar, India 2Department of Physics, ITER, Bhubaneswar, India. 3Research & Development Center, National Aluminium Company Limited, India 4Central Tool Room & Training Center, Bhubaneswar, India apayodharpadhi@gmail.com,b mohantypragyan91@gmail.com cbndash1974@yahoo.com dskkarcttc@gmail.com Key words: Nanocomposites, Full cavitation, ultrasonic, solidification Abstract: There are several methods for the production of metal matrix nano composites including mechanical alloying, vertex process and spray deposition.
[9] Jie Lan, Yong Yang and Xiaochun Li, Material Sc.
A, 366, 264-290, (2004) [10] Payodhar Padhi & Sachikanta Kar, A novel route for development of bulk Al-SiC metal matrix nano composites, Journal of Nano technplogy, 211(2011)