用温度依赖摩擦系数使用PFEM和SPH进行直角金属切割的热力学模拟:一项比较研究
Juan Manuel Rodríguez Prieto1,2, Simon Larsson2, Mohamadreza Afrasiabi3
1Escuela de Ciencias Aplicadas e Ingeniería, Universidad EAFIT, Cra 49 n 7-sur-50, Medellín 050022, Colombia.
Materials (Basel, Switzerland)
|May 27, 2023
概括
粒子有限元法 (PFEM) 和光滑粒子水力学 (SPH) 准确模拟AISI 1045钢切割. 对于两种方法来说,Ti6Al4V合金的加工证明是具有挑战性的,这表明在切割尺度上模拟其行为的困难.
科学领域:
- 计算力学是计算力学.
- 材料科学是一种材料科学.
- 制造工程 制造工程 制造工程
背景情况:
- 正角切割对于制造工艺至关重要.
- 精确模拟芯片形成对于预测加工性能至关重要.
- 在切割条件下模拟钢和合金等材料的热力学行为存在挑战.
研究的目的:
- 为了比较粒子有限元法 (PFEM) 和光滑粒子水力学 (SPH) 在模拟直角切割时的精度.
- 评估这些方法对AISI 1045钢和Ti6Al4V合金的晶片形成,热力学负荷和力的预测能力.
- 评估森-库克修改的构成模型对于这些材料在加工模拟中的适用性.
主要方法:
- 粒子有限元法 (PFEM) 和光滑粒子水力学 (SPH) 的应用,用于芯片形成模拟.
- 使用修改后的约翰逊-库克构成模型来表示工件材料的塑性行为.
- 使用温度依赖系数来实现库伦定律,用于模拟工件和工具之间的摩擦.
- 将数值预测与热力学负荷和切削力实验数据进行比较.
主要成果:
- 在预测AISI 1045钢的面温度时,PFEM和SPH都达到了不到34%的误差.
- 与AISI 1045钢相比,Ti6Al4V合金的温度预测误差明显高.
- 两种方法的力预测误差在10%至76%之间,与文献价值一致.
- 这项研究强调了在切割尺度上模拟Ti6Al4V行为的困难.
结论:
- PFEM和SPH是模拟AISI 1045钢直角切割的可行的数值方法,提供合理的温度预测.
- 在加工过程中模拟Ti6Al4V合金的热力学行为是复杂的,需要进一步调查,无论使用何种数值方法.
- 经过修改的约翰逊-库克模型,没有损坏或应变软化,为模拟提供了基础,但可能需要对Ti6Al4V等先进材料进行增强.
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