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Updated: Jul 2, 2025

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing
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Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing

Published on: February 11, 2016

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使用超声波引导波的复合粘合剂接头的粘合孔隙分析

Mohsen Barzegar, Yevgeniya Lugovtsova, Jannis Bulling

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
    |February 29, 2024
    PubMed
    概括

    这项研究引入了一种新的方法,用于检测复合材料接头的空隙,使用超声波引导波 (UGWs). 该技术有效地对小缺陷进行成像,改善制造过程中的质量控制.

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    Porosity in Cement Paste

    The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
    The balance of water to cement in the mix is...
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    Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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