动态力学分析
材料科学
粘弹性
动态模量
时间-温度叠加
耗散因子
叠加原理
复合材料
放松(心理学)
大气温度范围
热力学
聚合物
数学
电介质
数学分析
物理
社会心理学
光电子学
心理学
作者
Pradeep Lall,Madhu Kasturi,Hang Wu,Jeff Suhling,Edward W. Davis
标识
DOI:10.1115/ipack2021-74061
摘要
Abstract Automotive underhood electronics may be exposed to high temperature in the neighborhood of 100°C–200°C. Property evolution may impact reliability and accuracy of predictive models to assure desired use life. In this paper, evolution of properties of two underfill material properties are studied using DMA (Dynamic Mechanical Analyzer). The underfills are exposed to three different operational temperatures in the range of 100°C to 140°C for the measurements. The dynamic mechanical properties such as storage modulus (E′), loss modulus (E″), tangent delta (tan δ), and respective glass transition temperatures (Tg) are studied using DMA. Study of viscoelastic behavior of underfills is achieved by performing TTS (time-temperature superposition) experiments at 7 discrete frequencies 0.1, 0.21, 0.46, 1, 2.15, 4.64, and 10 Hz using DMA in three-point bend mode. From the selected reference temperatures, the master curves were constructed for storage moduli, loss moduli and tan delta as a function of frequency using TTS results. Using the WLF (Williams-Landel-Ferry) equation, the shift factors as a function of temperature were determined along the frequency axis. The relaxation modulus as a function of temperature and time can be obtained using the master curves of storage and loss moduli. A simple and detailed procedure has been established to find the Prony series constants.
科研通智能强力驱动
Strongly Powered by AbleSci AI