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Plane lapping method using the elasticity of materials has many advantages comparing with current machining method for aspherical surface machining.
Introduction As the major machining methods in large volume production of aspherical workpieces, precision injection molding and glass molding have many advantages such as high efficiency and good compatibility when comparing with the traditional cold working methods[1], but there are still some problems during the machining process; for example, as the materials are heated, the property like refractive index will slightly change and when cool down, the materials will shrink which cause the profile errors[2].
Plane machining method using the elasticity of materials has been seen in few references such as the machining of Schmidt correctors[3].The basic principle of the plane lapping method using elastic deformation is: lapping one side of the workpiece when it is deformed and after recovery the un-lapped side will become the deformed profile, so the complex aspherical surface machining is converted to simple flat surface machining.
Acknowledgements This research is supported by the National Science Foundation of China (50705028, 50975085).
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Pavement recycled technology could not only recycle old pavement materials, protect the environment and save resources, reduce the construction cost, and could also correct the defects of old road surface material, improve the original structure, and extend the life of the road.
Researches indicate that the application of cold recycling materials in the base and sub-base of pavement would completely meet the requirement.
Since intensity strength of hot-mix asphalt mixture is obviously higher than that of recycled materials, the stress it can bear is greater than recycled materials under same stress.
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Dual-Functional Phase Change Nano-Capsules Based on n-Octadecane Core and Polypyrrole Shell Yanyang Yang1,2,a, Hao Wang1,2, Guolin Song1,b, and Guoyi Tang1,2,c, 1 Institute of Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China 2 Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Haidian District, Beijing 100084, China ayangyy12@mails.tsinghua.edu.cn, bsong.guolin@sz.tsinghua.edu.cn (corresponding author), ctanggy@tsinghua.edu.cn (corresponding author) Keywords: phase change materials; polypyrrole; nano-capsule; n-octadecane; energy storage.
Experimental Pyrrole (PY, 99 wt.%, Aladdin Industrial corporation) was used as shell materials.
N-octadecane(99 wt.%, Alfalfa) was used as phase change materials core.
Thermal behavior is one of the most important properties of phase change materials.
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Some coatings materials like nano, ceramic, metal ceramic, iron-based amorphous etc, based on supersonic flame spraying, plasma spraying technologies, have been used in production [1-7].
Materials and Experiments Experimental Materials The coatings were sprayed onto Q235 steel test specimen (40×20×5mm3).
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To obtain an alloy with the required properties, the quality of the charge materials used must be considered.
Most of the methods for obtaining metallic structural materials are associated with their stay in a liquid state.
Wika, The additive manufacture processing and machinability of CrMnFeCoNi high entropy alloy, Materials & Design. 198 (2021) 109380
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The Material model of surrounding rock and ore body was coulomb-mohr model, The excavation and filling section parts used zero element model,gravity effect was considered in the process of simulation.mesh of slope induced by goaf was shown in fig.1.
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Introduction Ultrafine-grained and nano-grained materials possess many attractive features.
Brittleness is a typical characteristic of UFG and nano-grained materials [3].
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