Technical Library | 2020-12-16 18:38:49.0
Fabrication of large structures using out-of-autoclave prepreg materials will lead to a great amount of savings in manufacturing costs. In the out-of-autoclave processing method, the presence of voids inside the laminate has been an issue due to the lack of high pressure during manufacturing. This study aims primarily to observe the moisture absorption response of composite samples containing different levels of void. By changing the vacuum level inside the bag during the manufacturing process, three different unidirectional laminates at three levels of void have been manufactured. After immersing the samples in warm water at 60°C for about one year, the moisture absorption level was monitored and then diffusion coefficients were calculated using Fick's law. Results show that the moisture absorption coefficient changes by %8 within the experimental range of void contents. The mechanical behaviour of these laminates has been studied at four different moisture levels by performing dynamic mechanical analysis (DMA) and short beam shear tests. Empirical results indicate that, in general, interlaminar shear strength and glass transition temperature decrease by moisture build-up inside the samples. DiBenedetto equation is proposed to make a correlation between the moisture content and glass transition temperature.
Technical Library | 2021-06-02 19:34:48.0
In recent years, there has been dynamic changes in the industrial environment as a result of further innovations called Industry 4.0 (I.4.0), especially in the field of digital technology and manufacturing. Despite numerous examples of the implementation of Industry 4.0 in enterprises, there is no general framework for the implementation of Industry 4.0 with a detailed schedule. Researching the ways of implementing Industry 4.0 is still a current and unexplored area of research. The main aim of the paper is to present the concept of the theoretical framework for Industry 4.0 implementation based on selected schedules of the Industry 4.0 implementation. The paper was based on information from literature review and analysis of pilot enterprise projects to Industry 4.0 (case study) that were conducted in selected enterprises. The paper presents the key components of the framework of Industry 4.0 and the basic stage of implementing the concept in the enterprises, paying attention to their sequence and time frames. The proposed approach is dedicated to researchers and practitioners who implement the concept of Industry 4.0 in enterprises
New Equipment | Test Equipment
The SR760 and is a single-channel, 100 kHz FFT spectrum analyser with a dynamic range of 90 dB and a real-time bandwidth of 100 kHz. The speed and dynamic range of these instruments, coupled with their flexibility and many analysis modes, makes them
Used SMT Equipment | General Purpose Test & Measurement
Key Features & Specifications Return loss dynamic range > 75 dB Return loss uncertainty down to ±0.25 dB with external broadband source Wide operating wavelength range: 1250 nm to 1640 nm Built-in Power Monitor and Laser Source: 131
Used SMT Equipment | In-Circuit Testers
Rohde & Schwarz ESMI EMI Test Receivers ESBI and ESMI combine the top-class specifications of Rohde&Schwarz EMI test receivers with the speed of Rohde& Schwarz spectrum analyzers. The integral measurement and analysis functions simplify and speed
Used SMT Equipment | General Purpose Test & Measurement
Description This product is discontinued. Support life for the 8757D will be through January 1, 2016. Accessory products for the 8757D will continue to be orderable through November 30, 2014. Support life for the accessories will be through Januar
Used SMT Equipment | General Purpose Test & Measurement
Rohde & Schwarz ESIB26 20 Hz to 26.5 GHz EMI Test Receiver The ESIB family of EMI test receivers combines the flexibility and speed of spectrum analyzers with the large dynamic range required for EMI measurements in conformance with standards.
Used SMT Equipment | General Purpose Test & Measurement
Agilent-Keysight E8357A-015 PNA Network Analyzer, 300 kHz to 6 GHz The ENA Series covers the frequency range of 300 kHz to 8.5 GHz, and is available in 2, 3 and 4 port models. The PNA-L Series offers the key features of the RF PNA and is code-c
Used SMT Equipment | General Purpose Test & Measurement
The CMA 5000 Optical Time Domain Reflectometer (OTDR) application reduces the time to install, commission and maintain fibre spans via high performance hardware and easy-to-use software. Featuring a multitude of single mode and multimode wavelengths,
Used SMT Equipment | General Purpose Test & Measurement
E5080B Main features Industry's Most Flexible and Integrated ENA Vector Network Analyzer choose either a 2- or 4-port option select a frequency range from 9 kHz to 4.5/6.5/9/14/20 GHz or 100 kHz to 26.5/32/44/53 GHz achieve complete device char