首页>
外文期刊>journal of applied polymer science
>Continuous measurement of dynamic tensile mechanical properties in polymer solids over a wide range of frequencies. I. An instrument with driving force of 15 kgwt and frequency range 10−3–102Hz
【24h】
Continuous measurement of dynamic tensile mechanical properties in polymer solids over a wide range of frequencies. I. An instrument with driving force of 15 kgwt and frequency range 10−3–102Hz
展开▼
机译：Continuous measurement of dynamic tensile mechanical properties in polymer solids over a wide range of frequencies. I. An instrument with driving force of 15 kgwt and frequency range 10−3–102Hz
AbstractTwo compact apparatuses were designed and fabricated for the study of dynamic mechanical viscoelastic behavior in polymer solids over a wide range of frequencies: (1) 10−3–102Hz with a tensile driving force of 15 kgwt, and (2) 10–104Hz with a maximum tensile driving force of 15 kgwt. The present paper reports the details of the instrument of (1). The instrument contains a nonresonant and forced vibration system, where the rectilinear vibration is taken from the rotating shaft of the driving motor through the double eccentric crank and conrod‐slider machineries. Measurements can be conducted at any desirable frequency (10−3‐102Hz) and displacement (0–2 mm). Subjected to longitudinal vibration, the stress and strain in the specimen are detected by a compression‐type load cell and noncontacting displacement meter, respectively. The specimen clamp was especially devised for the compression‐type load cell, which enables direct conversion from the tensile force on the specimen to the compressive force against the load cell without any medium. Another feature of the instrument is a vertical combination of vibrational driving system, specimen clamp, and load cell. These are important for the effective transmission of the driving force to the specimen and avoidance of unnecessay mechanical vibration noises. From the Lissajous' figure formed with two signals of the stress and strain, the values of dynamic tensile modulus and loss factor for polymeric materials ar
展开▼
