Measurement of temperature-dependent viscoelastic compressibility of highly-filled thermosets using inert gas pressure

IF 5 2区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of The Mechanics and Physics of Solids Pub Date : 2025-02-18 DOI:10.1016/j.jmps.2025.106087

Sukrut Prashant Phansalkar, Bongtae Han

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引用次数: 0

Abstract

Highly filled thermosets are widely used to encapsulate chips in the semiconductor packaging industry. A complete set of viscoelastic properties are required for package designs with optimum mechanical reliability. A novel test method, based on inert gas pressure, is proposed and implemented to measure the temperature-dependent viscoelastic hydrostatic creep compliance (or compressibility) of filled thermosets. The method utilizes linearly increasing pressure to mitigate a heat generation problem caused by instantaneous gas pressure application. The hereditary integral for the linear pressure application is derived, and the corresponding normal equations are developed to obtain the generalized Kelvin model constants analytically. The proposed method is implemented using an epoxy-based molding compound. Complete implementation schemes are described, and the compressibility master curve is presented. The validity of the proposed method is verified by supplemental long-term hydrostatic creep tests. The accuracy and repeatability of the proposed method are also discussed.

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来源期刊

Journal of The Mechanics and Physics of Solids 物理-材料科学：综合

CiteScore

9.80

自引率

9.40%

发文量

276

审稿时长

52 days

期刊介绍： The aim of Journal of The Mechanics and Physics of Solids is to publish research of the highest quality and of lasting significance on the mechanics of solids. The scope is broad, from fundamental concepts in mechanics to the analysis of novel phenomena and applications. Solids are interpreted broadly to include both hard and soft materials as well as natural and synthetic structures. The approach can be theoretical, experimental or computational.This research activity sits within engineering science and the allied areas of applied mathematics, materials science, bio-mechanics, applied physics, and geophysics. The Journal was founded in 1952 by Rodney Hill, who was its Editor-in-Chief until 1968. The topics of interest to the Journal evolve with developments in the subject but its basic ethos remains the same: to publish research of the highest quality relating to the mechanics of solids. Thus, emphasis is placed on the development of fundamental concepts of mechanics and novel applications of these concepts based on theoretical, experimental or computational approaches, drawing upon the various branches of engineering science and the allied areas within applied mathematics, materials science, structural engineering, applied physics, and geophysics. The main purpose of the Journal is to foster scientific understanding of the processes of deformation and mechanical failure of all solid materials, both technological and natural, and the connections between these processes and their underlying physical mechanisms. In this sense, the content of the Journal should reflect the current state of the discipline in analysis, experimental observation, and numerical simulation. In the interest of achieving this goal, authors are encouraged to consider the significance of their contributions for the field of mechanics and the implications of their results, in addition to describing the details of their work.