Couplings material flexing

Laminated disk-ring couplings (material-flexing) Bellows couplings (material-flexing)... 

Material-flexing couplings Material-flexing couplings are designed to be lubrication free. 

Material-flexing couplings incorporate elements that accommodate a certain amount of bending or flexing. 

The material-flexing group includes laminated diskring, bellows, flexible shaft, diaphragm, and elastomeric couplings. 

Lubrication requirements vary depending on application and coupling type. Because rigid couplings do not require lubrication, this section discusses lubrication requirements for mechanical-flexing, material-flexing, and combination flexible couplings only. 

Various materials (e.g., metal, plastics, or rubber) are used to make the flexing elements in these couplings. The use of the couplings is governed by the operational fatigue limits of these materials. Practically all metals have fatigue limits that are predictable, therefore, they permit definite boundaries of operation to be established. Elastomers such as plastic or rubber, however, usually do not have a well-defined fatigue limit. Their service life is determined primarily by conditions of installation and operation. 

The zeolites obtained were characterised by a number of techniques including XRD (Seifert diffractometre JSO Debye-Flex 200, with Cu Ka radiation), DR-FTIR spectroscopy (Matson INFINITY), scanning electron microscopy (SEM, Jeol JSM-840), EDX (coupled to the SEM, Link QX-200) and thermogravimetry. As a summary, the zeolites prepared are crystalline materials, which are only constituted by the desired phase. Table 1 contains the molecular formulas of the zeolites prepared and Table 2 presents their main crystallographic characteristics. 

In order to evaluate the contraction behavior of the candidate liner material when coupled to a laminate composite, a simple immersion test was performed on selected samples. The specimens were immersed in a liquid-hydrogen bath for 45 min upon removal they were subjected to a qualitative examination, for cracks, color change, etc. All films tested reacted favorably except the aluminized Mylar, which developed cracks in the aluminum upon flexing, and Kynar, which was very brittle and cracked without external load. Contraction properties of various materials are shown in Fig. 3. 

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