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Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

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Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
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基于反转算法的NEPE推进剂大尺度建模和损伤机制研究.

Zhenyuan Hu1, Kaining Zhang1, Qiqi Liu1

  • 1State Key Laboratory for Strength and Vibration of Mechanical Structure, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China.

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概括
此摘要是机器生成的。

这项研究开发了一个模拟NEPE推进剂的模型.

关键词:
在CZMM中.在NEPE中使用的推进剂.这是一个RVE模型.损害进化过程 损害进化过程逆转算法 逆转算法 逆转算法

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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算力学 计算力学 计算力学
  • 固体推进剂的特性 固体推进剂的特性

背景情况:

  • 对NEPE (酸乙烯塑化聚乙烯) 推进剂来说,准确地表征中观性质至关重要.
  • 现有的模型可能无法完全捕捉NEPE推进剂的复杂机械行为和损伤演变.

研究的目的:

  • 开发和验证一个计算模型来模拟NEPE推进剂的中观损伤和宏观机械性能.
  • 研究不同拉伸率对NEPE复合固体推进剂机械反应的影响.

主要方法:

  • 使用机械收缩方法构建一个代表体积元件 (RVE) 模型.
  • 通过胡克-吉夫斯算法对宏观机械反应的模拟和凝聚性区域模型 (CZM) 参数的逆优化.
  • 对单轴拉伸试验结果进行验证,并预测不同拉伸速率的行为.

主要成果:

  • 开发的模型有效地模拟了NEPE推进剂的中视损伤演变和宏观机械性能.
  • 预测的应力-应变曲线与实验数据有很好的一致性,捕捉了关键特征和趋势.
  • 该模型准确地预测了一系列延展率的机械行为.

结论:

  • 已建立的基于RVE的CZM模型为模拟NEPE复合固体推进剂提供了有效的工具.
  • 这种方法提高了对中视镜损伤机制和宏观机械性能的理解.
  • 经过验证的模型可用于进一步分析和优化NEPE推进剂的设计.