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関連する概念動画

Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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The blood in our bodies comprises three major components: blood plasma, formed elements, and the extracellular matrix. Blood plasma is a yellowish fluid that constitutes 55% of the total blood volume. It is primarily made up of water and essential substances such as electrolytes and proteins. Blood plasma serves as a medium for transporting blood cells and also contains nutrients, enzymes, hormones, antibodies, and gases.
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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
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複合材料積層板の湿熱環境下における進行性損傷モデル

Dong Zhou1, HongJun Liu2, ShengLi Lv2

  • 1School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.

ACS omega
|January 26, 2026
PubMed
まとめ

湿熱劣化は炭素繊維複合材料の性能を低下させる。新しいモデルは、これらの環境下での破壊を予測し、T300/5208複合材料の強度低下が水分と熱により10.3%であることを示す。

キーワード:
進行性損傷モデリング複合材料湿熱環境炭素繊維強化ポリマー破壊力学材料劣化

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
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関連する実験動画

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科学分野:

  • 材料科学
  • 機械工学
  • 複合材料

背景:

  • 炭素繊維強化ポリマー複合材料は、湿熱劣化による機械的特性の低下を受けやすい。
  • 環境ストレス下でのこれらの材料の破壊を理解し予測することは、構造健全性にとって極めて重要である。

研究 の 目的:

  • 湿熱環境下での複合材料構造の破壊を予測するための3次元進行性損傷モデルを開発し、検証すること。
  • T300/5208複合材料の機械的特性と破壊メカニズムに対する湿熱劣化の影響を分析すること。

主な方法:

  • 有限要素解析ソフトウェア内で損傷進展をシミュレートするためのUMATサブルーチンの開発。
  • 湿熱条件（70℃、85% RH）下でのT300/5208試験片を用いた吸湿および3点曲げ試験を含む実験的試験。
  • 断面および破壊形態を観察するための顕微鏡分析（デジタル顕微鏡、FSEM）。

主要な成果:

  • 提案されたモデルは、湿熱環境下での破壊モードと損傷進展を正確に予測する。
  • T300/5208複合材料の飽和吸湿率は約0.56%に達した。
  • 湿熱劣化により、T300/5208複合材料積層板の曲げ強度が10.3%低下した。

結論:

  • 開発された進行性損傷モデルは、湿熱劣化下での複合材料の挙動を評価する上で効果的である。
  • 湿熱暴露は炭素繊維複合材料の機械的性能に著しく影響を与える。
  • 破壊形態の詳細な分析は、湿熱劣化メカニズムに関する洞察を提供する。