Linked Heat Treatment and Bending Simulation of Aluminium Tailored Heat Treated Profiles

Linked Heat Treatment and Bending Simulation of Aluminium Tailored Heat Treated Profiles
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铝定制热处理型材的关联热处理和弯曲模拟

DOI:
10.1007/978-3-319-57864-4_22
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发表时间:
2017
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影响因子:
--
通讯作者:
Fröck
Fröck
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--
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作者:
Fröck

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沉淀硬化铝合金可以通过在局部短期热处理期间溶解增加强度的沉淀物来定制机械性能。定制热处理型材(THTP)是具有局部不同材料特性的铝挤压型材,专门针对后续弯曲工艺进行优化。需要在硬化区域旁边生成软化区域,以优化成形过程中的材料流动。为了确定软化和硬化区域的优化布局,由短期热处理和后续成形过程的模拟组成的过程链模拟似乎是有目的的。短期热处理的数值模拟需要热模拟和机械模拟的耦合计算,特别关注微观结构的评价,从而关注机械性能的变化。采用差示扫描量热法研究了6060 T4铝型材在加热和冷却过程中的溶解和析出行为。热机械分析应用于机械性能的评价。这种行为应该用LS DYNA软件在材料模型中描述。热处理模拟提供了机械性能沿着轮廓的分布,这是后续成形模拟的重要输入参数。为了避免热处理模拟和成形模拟之间的信息丢失,两个链接的模拟都使用LS DYNA软件进行。
Precipitation hardening aluminium alloys enable tailoring of mechanical properties through the dissolution of strength-increasing precipitates during a local short-term heat treatment. Tailor Heat Treated Profiles (THTP) are aluminium extrusion profiles with locally different material properties, specifically optimised for succeeding bending processes. Softened areas need to be generated next to hardened areas to optimise the material flow during the forming process. To determine the optimised layout of softened and hardened areas, a process chain simulation consisting of the simulation of the short-term heat treatment and the subsequent forming process seems purposeful. The numerical modelling of short-term heat treatment requires a coupled computation of thermal and mechanical simulation with particular focus on the evaluation of microstructure and consequently on the change of mechanical properties. The dissolution and precipitation behaviour during heating and cooling of aluminium profiles 6060 T4 is investigated using differential scanning calorimetry. Thermo-mechanical analysis is applied for evaluation of the mechanical properties. This behaviour should be described in a material model with the software LS DYNA. The heat treatment simulation provides a distribution of mechanical properties along the profile, which is an important input parameter for the following forming simulation. In order to avoid a loss of information between the heat treatment simulation and forming simulation, both linked simulations are performed with the software LS DYNA.
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