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首頁> 外文學(xué)位 >Elastoplastic modelling of multi-phase fiber-reinforced composites with void growth using transformation field analysis and the governing parameter method.
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Elastoplastic modelling of multi-phase fiber-reinforced composites with void growth using transformation field analysis and the governing parameter method.

機(jī)譯：利用相變場分析和控制參數(shù)方法對空洞增長的多相纖維增強(qiáng)復(fù)合材料進(jìn)行彈塑性建模。

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摘要

Fiber-reinforced composites have many advantages over conventional engineering materials. However, the intrinsic inhomogeneities of fiber-reinforced composites have made the prediction of the mechanical behavior of such a material a great challenge over the past three decades. In this dissertation, a micromechanical-based computational model within the context of finite element, method is developed so as to predict the overall elastoplastic behavior of n-phase fiber-reinforced composite with degrading matrix phase due to void growth. The computational micromechanics framework is based on the Transformation Field Analysis which takes into account the microstructure of the individual phases. The evolution of porosity is governed by the rate of void growth and the yield criterion is based on the model proposed by Gurson-Tvergaard. To integrate the overall governing equations, an implicit stress integration scheme based on a modified Governing Parameter Method is employed to replace the explicit integration scheme commonly used and documented in the literature. The evaluation and verification of the proposed computational framework is carried out by comparing the results with numerical and experimental case studies published in the literature. In addition, an extensive parametric study has been completed to study the influence of the governing parameters on the overall mechanical behavior of fiber-reinforced composites. Finally, to demonstrate the application of the proposed methodology, the proposed constitutive model has been implemented in a finite element commercial software to study the effect of impact loading on particle-reinforced composite structures.
機(jī)譯：纖維增強(qiáng)的復(fù)合材料比常規(guī)工程材料具有許多優(yōu)勢。然而，在過去的三十年中，纖維增強(qiáng)復(fù)合材料固有的不均勻性使這種材料的機(jī)械性能預(yù)測成為一個巨大的挑戰(zhàn)。本文基于有限元方法建立了基于微機(jī)械的計算模型，以預(yù)測由于孔隙增長而使基體相退化的n相纖維增強(qiáng)復(fù)合材料的整體彈塑性行為。計算微力學(xué)框架基于“轉(zhuǎn)換場分析”，其中考慮了各個相的微觀結(jié)構(gòu)?？紫抖鹊难莼芸紫堵实目刂疲?zhǔn)則基于Gurson-Tvergaard提出的模型。為了集成總體控制方程，采用了基于改進(jìn)的“控制參數(shù)方法”的隱式應(yīng)力積分方案來代替文獻(xiàn)中常用和記錄的顯式積分方案。通過將結(jié)果與文獻(xiàn)中發(fā)表的數(shù)值和實驗案例研究進(jìn)行比較，可以對所提出的計算框架進(jìn)行評估和驗證。此外，已經(jīng)完成了廣泛的參數(shù)研究，以研究控制參數(shù)對纖維增強(qiáng)復(fù)合材料整體機(jī)械性能的影響。最后，為了證明所提出方法的應(yīng)用，已在有限元商業(yè)軟件中實施了所提出的本構(gòu)模型，以研究沖擊載荷對顆粒增強(qiáng)復(fù)合結(jié)構(gòu)的影響。

著錄項

  • 作者

    Ng, Ernest Tin Yau.;

  • 作者單位

    University of Victoria (Canada).;

  • 授予單位 University of Victoria (Canada).;
  • 學(xué)科 Applied Mechanics.
  • 學(xué)位 Ph.D.
  • 年度 2007
  • 頁碼 198 p.
  • 總頁數(shù) 198
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 應(yīng)用力學(xué);
  • 關(guān)鍵詞

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