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Tensile Yield in Polymers
Published in Nicholas P. Cheremisinoff, Elastomer Technology Handbook, 2020
The output of the strain gauge extensometer is fed to the x-axis of an x-y recorder while the y-axis is the applied load from the load cell. Thus, the output of the measurement is a continuous load-elongation curve at a given cross-head speed and temperature. When measurements as a function of temperature are desired, an environmental chamber is used. Pressure measurements are more involved and details of the equipment are given in the literature.9 After the test, the load-elongation curve is converted to a stress-strain curve. Note that the cross-head speed is used only to specify the rate at which the test is run, not to determine the strain. Calculating strain from the cross-head speed rather than from an extensometer is not accurate. The test is run until, by eye, the stress goes through a maximum and then is manually stopped. Thus, the test always goes a little past the yield point, making it difficult to make accurate measurements of permanent deformation at yield.
A comparative study of the polarization–depolarization current measurements on different polymeric materials
Published in Debatosh Guha, Badal Chakraborty, Himadri Sekhar Dutta, Computer, Communication and Electrical Technology, 2017
A. Kumar, N. Haque, R. Ghosh, B. Chatterjee, S. Dalai
In order to investigate the effect of temperature on the insulating properties of the aforementioned insulating materials, the PDC measurement was made on the sample, keeping it in an environmental chamber. The environmental chamber used in these studies is procured from Thermotron, which offers controlled chamber environment from −40 to 198°C. In addition to temperature, humidity can be controlled from 10% to 97% inside the chamber. The sample under study is kept in the environment chamber at a certain temperature and humidity for 1 h before starting the measurement and PDC measurements are taken subsequently.
Shear fracture energy of asphalt-aggregate systems and its application to predicting shear fatigue in asphalt mixtures
Published in International Journal of Pavement Engineering, 2020
Mansheng Dong, Yanhai Hao, Chao Zhang, Linglin Li, Wei Sun, Can Jin
The direct shear test apparatus, as shown in Figure 2, is designed to match a microcomputer control electronic universal testing machine (WDW-1) and equipped with an environmental chamber. The environmental chamber can maintain temperature ranging from −40 to 120 °C with an error within ±0.5 °C. The shear box that is fixed in environmental chamber, consists of a loading block, a clamping device and a guide rail. Similar apparatus (Yin et al.2015) has been employed in former researches to investigate the shear characteristics of asphalt mixtures. The loading block is fixed on the loading head of WDW-1, while the guide rail is fastened to the base of WDW-1. The clamping device is fixed on the guide rail and can be moved only along the guide rail to meet requirement of the test. There is a gap about 1 mm between the right face of the loading block and the left face of the clamping device, and the asphalt film of the sandwiched specimen is placed in a centre position of the narrow gap. The right part of specimen is fastened by the clamping device, while the left part is fasten by another clamping device controlled by the guide rail.
Considering Shear Behavior of Beam-Column Connections to Assess the Seismic Performance of RC Frames Subjected to Freeze-Thaw Cycles
Published in Journal of Earthquake Engineering, 2021
Qing Qin, Shansuo Zheng, Liguo Dong, Piji Hou, Feng Wang
The environmental chamber, which can simulate various atmospheric environment, such as high temperature, various humidity levels, salt spray, solar irradiance, acid rain, and carbon dioxide levels was used for durability testing. The Model ZHT/W2300 environmental chamber was manufactured by Wuhuan 0000 [Wuhuancq] with a temperature range of −20 to 80°C and dimensions of 2.5 m long, 2 m tall and 2 m wide, as shown in Figure. 2. The primary technical indicators were detailed as follows:
A pre-processing method of internal thermal mass for building energy simulation software
Published in Journal of Building Performance Simulation, 2021
Weilin Li, Liu Yang, Jiayin Zhu, Ruixin Li
The experimental platform to test θ is shown in Figure 4. The framework consists of two identical test rooms and an environmental chamber. The test rooms can be set to have different scenarios to imitate practical building environments. The environmental chamber provides a controlled ambient environment (temperature, humidity, wind speed, and solar radiation) for the test rooms through an air-conditioning system and shading device.