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Electrical installation methods, procedures and requirements
Published in Trevor Linsley, Electrical Installation Work Level 2, 2019
Crimp terminals are made of tinned sheet copper. The chosen crimp terminal is slipped over the end of the conductor and crimped with the special crimping tool. This type of connection is very effective for connecting equipotential bonding conductors to approved earth clamps. Smaller crimp tools are hand operated whereas the larger crimps require hydraulic crimpers to ensure the correct pressure is achieved.
Low–Power Commercial, Automotive, and Appliance Connections
Published in Paul G. Slade, Electrical Contacts, 2017
In the termination process, the wire insulation is stripped, the bare section of the wire is inserted into the crimp wing or barrel region, and a crimp tool presses the barrel or rolls the wings that collapse around the wire creating both mechanical and electrical bonding. Crimps have been used for decades joining wires and terminals of various sizes with extremely good results. To understand the physics of crimping, one must look at how a crimp is formed (See also Chapter 5).
Electrical Contacts
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
Crimped joints employ the ultimate extreme force of contact making, causing the metal to flow, and make a permanent connection. These types of joints are very attractive for permanent connections due to the trouble-free nature of these joints, and the simplicity and rapidity of the crimping operation. Bolted or crimped contacts are used in interrupting chambers to secure and to maintain the integrity of the electrical component. Bolting is used because it is cheap and convenient.
Development and experimental validation of a mathematical model of shear rigidity of woven fabric structures
Published in The Journal of The Textile Institute, 2025
Md Samsu Alam, Abhijit Majumdar, Anindya Ghosh
The tensile moduli (E1, E2 and E45 in mN/mm) of fabrics were determined by extending the fabric sample on Instron tensile tester with a crosshead speed of 20 mm/min. The average gradient of fabric load-elongation curve up to 1% strain was taken as a measure of the fabric initial modulus. Five readings were taken in each direction to determine the average values of E1, E2 and E45. When a fabric is subjected to tensile loading, the fabric is elongated in the direction of applied load and there is concomitant contraction in the transverse direction. During tensile deformation, the crimp in the load bearing yarns decreases, while that in transverse yarns increases due to crimp interchange. The length wise extension is accompanied by width wise contraction. Due to the restriction of jaws, the contraction is highest around middle of specimen length. This phenomenon is termed as ‘waisting’ (Figure 8). The ratio of strain in transverse to longitudinal direction is called Poisson’s ratio (Hursa et al., 2009).
A review on novel approaches to enhance sound absorbing performance using textile fibers
Published in The Journal of The Textile Institute, 2022
Jayawardana Withanage Achini Madushika, Wilathgamuwage Don Gamini Lanarolle
Crimp is measured by several parameters such as wavelength, crimp length, crimp frequency, crimp angle, crimp index, crimp amplitude and crimp degree. Crimp frequency is defined as the number of crimp bows or waves per unit length of straightened fibre (Maity, 2014). Panahi et al. (2015) studied the effect of crimp frequency on sound absorption coefficient of batts (large fibre sheets layered using a laboratory carding machine) comprised staple polypropylene fibres with crimp frequencies of 1.9, 2.3 and 3.6 crimp per cm and found that higher crimp frequency results in higher sound absorption. The highest sound absorption coefficient observed was 0.78 for the crimp frequency of 3.6. When the crimp frequency of samples was increased for constant weight, it was resulted shorter straight fibre lengths and more number of creases along the fibres reducing the available surface for sound reflection. Increasing fibre crimp led to higher tortuosity offering a higher resistance against the sound waves. The increased resistance due to tortuous passages is the main reason for the increase in sound absorption.
Effect of microstructure on porosity of random fibrous networks
Published in The Journal of The Textile Institute, 2020
Emrah Sozumert, Yasar Kiyak, Emrah Demirci, Vadim V. Silberschmidt
In parametric investigations, four main modeling parameters – fiber diameter, solid volume fraction (1 − ), ODF and fiber crimp – were studied. Numerical models were prepared for analysis of the effect of each modelling parameter using a specifically developed Python® script. A reference model was generated to make comparisons for parameters studied. For the reference case, three statistical realizations of the numerical model with the same microstructure parameters were prepared. The window of interest each model with length ln and width wn was selected as 500Df ×500Df. The reference model was generated with circular cross-section fibers having 1 μm diameter, SVF = 0.1 and a fully random ODF. Except for a special study on crimp, no crimp was implemented in numerical models.