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首頁> 外文學(xué)位 >A micromechanics-inspired three-dimensional constitutive model for the thermomechanical response of shape-memory alloys.
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A micromechanics-inspired three-dimensional constitutive model for the thermomechanical response of shape-memory alloys.

機(jī)譯：微機(jī)械啟發(fā)的三維本構(gòu)模型，用于形狀記憶合金的熱機(jī)械響應(yīng)。

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The goal of this thesis is to develop a three-dimensional micromechanics-inspired constitutive model for polycrystalline shape-memory alloys. The model is presented in two forms: (1) The one-dimensional framework where we picture the ability of the model to capture the main properties of shape-memory alloys such as superelasticity and the shape-memory effect; (2) the three-dimensional model where micromechanics origins of the model, the concepts that emerged from those analyses and their relation to macroscopic properties in both single and polycrystals are presented.; We use this framework to study the effects of the texture and anisotropy in material behavior. Since phase transformation often competes with plasticity in shape-memory alloys, we incorporate that phenomenon into our model. We also demonstrate the ability of the model to predict the response of the material and track the phase transformation process for multi-axial, proportional and non-proportional loading and unloading experiments. We consider both stress-controlled and strain-controlled experiments and develop the model for isothermal, adiabatic and non-adiabatic thermal conditions. Adiabatic heating and loading rate both lead to apparent hardening at high rates. We also visit this problem and examine the relative role of these two factors.; Finally we extend our model to study the reversible alpha ↔ epsilon martensitic phase transformation in pure iron. We consider a wide range of loading rates ranging from quasistatic to high rate dynamic loading and use our model to describe the evolution of the microstructure along with the effects of rate hardening and thermal softening.
機(jī)譯：本文的目的是為多晶形狀記憶合金建立一個(gè)三維微力學(xué)啟發(fā)的本構(gòu)模型。該模型以兩種形式表示：（1）一維框架，其中我們描述了模型捕獲形狀記憶合金的主要特性（如超彈性和形狀記憶效應(yīng)）的能力； （2）提出了三維模型，其中模型的微力學(xué)起源，從這些分析中出現(xiàn)的概念以及它們與單晶和多晶宏觀性能的關(guān)系。我們使用此框架來研究紋理和各向異性對材料行為的影響。由于相變通常會在形狀記憶合金中與可塑性競爭，因此我們將這種現(xiàn)象納入模型中。我們還展示了該模型預(yù)測材料響應(yīng)并跟蹤多軸，比例和非比例加載和卸載實(shí)驗(yàn)的相變過程的能力。我們考慮了應(yīng)力控制和應(yīng)變控制的實(shí)驗(yàn)，并開發(fā)了等溫，絕熱和非絕熱熱條件的模型。絕熱加熱和加載速率均導(dǎo)致高速率下的表觀硬化。我們還探究了這個(gè)問題，并研究了這兩個(gè)因素的相對作用。最后，我們擴(kuò)展模型以研究純鐵中可逆的α?ε馬氏體相變。我們考慮了從準(zhǔn)靜態(tài)到高速動態(tài)加載的多種加載速率，并使用我們的模型描述了微觀結(jié)構(gòu)的演變以及速率硬化和熱軟化的影響。

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