China
Africa
Explore chapters and articles related to this topic
Thermomechanical Analysis
Published in Kevin P. Menard, Noah R. Menard, Dynamic Mechanical Analysis, 2020
Kevin P. Menard, Noah R. Menard
We should note here that an early style of TMA, which is still used in the glass industry, is called a pushrod dilatometer and requires large (100 mm or so) specimens. Pushrod dilatometers, in addition to enormous sample sizes, are also horizontal in design. With low expansion materials like quartz glasses, these allow measurement of low to sub-ppm expansion (ASTM E228). Dilatometers and TMA also use optical approaches. The first of these was the Fizeau-Abbe dilatometer using interferometry. Optical dilatometry prevents issues with materials that are easily deformed under extremely low forces, and also allows the measurement of extremely low CTEs often seen in ceramics, quartz, and some types of glasses. Material change when sintering is often a common application for optical dilatometer.
Thermomechanical behavior of lattice structures: An analytical, numerical, and experimental study
Published in Mechanics Based Design of Structures and Machines, 2023
Bahareh Abedini, Reza Hedayati, Mohammad Mohammadi Aghdam, Mojtaba Sadighi
As compared to numerical and analytical methods, the experimental measurement of CTE of structures is the most common approach. Several methods have been used for measuring coefficient of thermal expansion in different studies. Capacitance method, interferometric dilatometer, optical dilatometer, variable transformer technique, X-ray, and digital image correlation (DIC) are some common examples (Figgins, Jones, and Riley 1956; Maaßdorf et al. 2013). Analytical relationships as a function of geometrical features (pore size, strut thickness, etc.) facilitate obtaining the desired value for CTE in a particular structure. Moreover, a closed-form analytical relationship makes it much easier to be able to optimize a structure based on the requirements.