RESEARCH ON CREEP TEST AND CONSTITUTIVE MODEL COMPARISON OF COMРАСTED GRAPHITE CAST IRON UNDER WIDE TEMPERATURE AND STRESS RANGE

LI ShuBo; LIU Qian; JING GuoXi; ZHANG JunHai; WEI JunChao; YANG ZiYi; SUN Shuai

doi:10.16579/j.issn.1001.9669.2024.01.010

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RESEARCH ON CREEP TEST AND CONSTITUTIVE MODEL COMPARISON OF COMРАСTED GRAPHITE CAST IRON UNDER WIDE TEMPERATURE AND STRESS RANGE

更新时间：2024-04-18

- RESEARCH ON CREEP TEST AND CONSTITUTIVE MODEL COMPARISON OF COMРАСTED GRAPHITE CAST IRON UNDER WIDE TEMPERATURE AND STRESS RANGE
- Journal of Mechanical Strength Vol. 46, Issue 1, Pages: 70-76(2024)
- 作者机构：
  
  1. 河北工业大学机械工程学院
  2. 天津市新能源汽车动力传动与安全技术重点实验室
  3. 中国北方发动机研究所（天津）柴油机增压技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2024.01.010
  CLC： TG143.49
- Published：15 February 2024，
- 稿件说明：
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LI ShuBo, LIU Qian, JING GuoXi, et al. RESEARCH ON CREEP TEST AND CONSTITUTIVE MODEL COMPARISON OF COMРАСTED GRAPHITE CAST IRON UNDER WIDE TEMPERATURE AND STRESS RANGE. [J]. Journal of Mechanical Strength 46(1):70-76(2024)
DOI：

LI ShuBo, LIU Qian, JING GuoXi, et al. RESEARCH ON CREEP TEST AND CONSTITUTIVE MODEL COMPARISON OF COMРАСTED GRAPHITE CAST IRON UNDER WIDE TEMPERATURE AND STRESS RANGE. [J]. Journal of Mechanical Strength 46(1):70-76(2024) DOI： 10.16579/j.issn.1001.9669.2024.01.010.

摘要

随着发动机功率密度的增加，气缸盖在运行过程中所承受的温度和应力也增加，因此蠕变损伤预测需要考虑准确的蠕变本构模型和参数。针对蠕墨铸铁（Compacted Graphite cast Iron，CCI）气缸盖大范围的温度和应力工作条件，开展温度450~550℃、试验应力100~300 MPa条件下的 CGI蠕变试验，进行表征宽幅温度和应力下 CGI最小蠕变速率的蠕变本构模型对比研究。研究表明：与较小的温度和应力范围相比，在宽幅条件下 CGI更容易发生蠕变损伤，且温度相比应力更能促使 CGI发生蠕变变形；分别基于 Norton-Bailey幂律模型、Garofalo双曲正弦模型和变形机制的真应力（Deformation Mechanism-based True Stress，DMTS）模型，结合多目标优化方法，构建了CGI蠕变本构模型。其中，基于DMTS 模型的CGI蠕变模型有73%的预测值在两倍误差范围内，吻合效果在三种模型中为最佳。

Abstract

As the power density of an engine increases

so does the temperature and stress that the cylinder head is subjected to during operation. Therefore

creep damage prediction needs to consider accurate creep constitutive models and parameters. Aiming at the wide range of temperature and stress working conditions of the compacted graphite cast iron (CGI) cylinder head

CGI creep test was carried out at 450-550 °C and 100-300 MPa. The comparative study of creep constitutive models to characterize the minimum creep rate of CGI under a wide range of temperature and stress was carried out. The research shows that compared with a smaller range of temperature and stress

CGI is more prone to creep damage under wide conditions. and temperature can promote the creep deformation of CGI more than stress. Based on the Norton-Bailey power law model

the Garofalo hyperbolic sine model

and the deformation mechanism-based true stress (DMTS) model respectively

combined with the multi-objective optimization method

the CGI creep constitutive model was constructed. Among them

73% of the predicted values of the CGI creep model based on the DMTS model are within twice the error range

and the coincidence effect is the best among the three models.

关键词

蠕墨铸铁宽幅温度和应力范围蠕变试验蠕变本构模型最小蠕变速率多目标优化

Keywords

Compacted graphite cast ironWide temperature and stress rangeCreep testCreep-constitutive modelMinimum creep rateMulti-objective optimization

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