Xiu Fang

Shenyang Environmental Protection Bureau

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Ai Guo Pi

Beijing Institute of Technology

Feng Lei Huang

Jinan University

Hai Jun Wu

Beijing Institute of Technology

Hong Guo Ren

Zhejiang Center for Disease Control and Prevention

Gui Wen Li

Harbin Institute of Technology

Xin Xin Zhang

Guangxi Research Institute of Chemical Industry

Fei Qian

Second People's Hospital of Yunnan Province

Cooperative Institutions

Beijing Institute of Technology

Harbin University

Zhejiang Center for Disease Control and Prevention

Chongqing University

Northeast Petroleum University

Jinan University

Southern University of Science and Technology

China Jiliang University

Chinese Academy of Sciences

Zhengzhou Railway Vocational & Technical College

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Projectile Mass Loss Model Using the Coefficient of Friction for High-Speed Penetration into Concrete

Applied Mechanics and Materials (2014)

Fei Qian Hai Jun Wu Feng Lei Huang Ai Guo Pi Xiu Fang

In this paper, a model of the friction coefficient in the high-speed penetration process has been used, which considers the micro-asperities of the projectile surface, the adiabatic shearing and the heat conduction on the nose of projectile. It also considers that the coefficient of friction is a function of the sliding velocity. Then, an analytical model of mass loss based on the coefficient of friction and the revised dynamic spherical cavity expansion theory of the concrete material is constructed. An analytical estimate for the work done by friction force in the penetration could be calculated and the evaluation of mass loss of projectile could also be calculated by the heat translated from the work done by friction force. Finally, a comparative analysis between the calculated data and the experimental data of mass loss is done.

Dynamical friction

Penetration (warfare)

Shearing (physics)

Coefficient of friction

10.4028/www.scientific.net/amm.566.365

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Citations (1)

An Investigation on the Grooved-Tapered Projectile Penetrating into the Concrete Targets

Applied Mechanics and Materials (2014)

Xin Xin Zhang Hai Jun Wu Feng Lei Huang Ai Guo Pi Xiu Fang

Based on the dynamic spherical cavity expansion (SCE) theory of the concrete materials and the analysis of the experimental data, both the model of the petaling penetration with low speed and the model of the round hole penetration with high speed are constructed to describe the penetration of the grooved-tapered projectile in this paper. The penetration depth and the mass abrasion are calculated using the models, so are the change of the velocity and the acceleration of the projectile with the time in the stage of the low speed penetration. The results show for the grooved-tapered projectile penetrating the concrete, the error of the penetration depth and the mass abrasion between the theoretical value calculated using the petaling penetration model and the experimental data is less than 11%, when the initial velocity is lower than about 1000m/s. When the initial velocity is higher than about 1000m/s, the error of the penetration depth between the theoretical value calculated using the round hole penetration model and the experimental data is more than 20%, and the mass abrasion calculated is almost coincide with the experimental data. The research shows the models are suitable for the analysis of the grooved-tapered projectile penetrating the concrete target, and the grooved-tapered projectile is more valuable in the high speed penetration.

Penetration (warfare)

Abrasion (mechanical)

10.4028/www.scientific.net/amm.566.359

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Citations (2)

Thermal Performance Experimental Study of Hot Wall in Cold Region

Advanced materials research (2011)

Hong Guo Ren Gui Wen Li Xiu Fang

In order to satisfy the requirement of villages indoor thermal amenity in winter in cold district in north of china, thermal performance of level, vertical flue smoke organization form hot wall have been tested. The experiment use Testo flue gas analyzer, BES-C portable computer multi-channel data acquisition instrument, the infrared thermography and so on to acquire basic data of two type flue layouts hot wall. These parameters include smoke composition, the inport and export smoke temperature, smoke quantity, metope temperature of hot wall and so on. And then record the test data, calculate evaluation index of the thermal performance, which are metope temperature standard deviation, thermal inertia and heat efficiency, etc. According to the value of the heat efficiency, we can judge the thermal performance of two kind of hot walls. The test results shows that the heat efficiency of level flue smoke organization form is 68.9%, and the heat efficiency of vertical flue smoke organization form is 62.1%. The heat efficiency of hot wall in the form of level flue is higher, better meet the requirement of heating facilities in energy saving, residents thermal amenity.

Thermal efficiency

10.4028/www.scientific.net/amr.368-373.3711

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