PHYBALSIT ‐ Fatigue Assessment and Life Time Calculation of the Ductile Cast Iron EN‐GJS‐600 at Ambient and Elevated Temperatures
PHYBALSIT ‐ Fatigue Assessment and Life Time Calculation of the Ductile Cast Iron EN‐GJS‐600 at Ambient and Elevated Temperatures
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PHYBALSIT â 球墨铸铁 ENâGJSâ600 在环境温度和高温下的疲劳评估和寿命计算
DOI：
10.1007/978-3-319-48191-3_90
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Dietmar Eifler
中科院分区：
文献类型：
--
作者：
Benjamin Jost;Marcus Klein;Dietmar Eifler
本文以内燃机零件常用球墨铸铁EN-GJS-600为研究对象。在使用条件下，这些组件在不同的温度下进行机械加载。因此，本研究针对EN-GJS-600在常温和高温下的疲劳行为进行了研究。用光学显微镜和扫描电子显微镜对石墨的球形度以及铁素体、珠光体和石墨部分进行了表征。在高温下，动态应变时效效应的考虑是非常重要的。在总应变增量、温度升高和恒定总应变幅值试验中，测量了材料的塑性应变幅值、应力幅值、温度变化和电阻变化。测量值取决于大部分试件的塑性变形过程以及基体和石墨界面的塑性变形过程。EN-GJS-600的疲劳行为主要受循环硬化过程的影响。基于物理的疲劳寿命计算“PHYBALSIT”(SIT=应变增长试验)是为总应变控制疲劳试验而开发的。只需进行一次温升试验，即可确定具有显著动态应变时效效应的温度区间。
This paper focuses on the ductile cast iron EN-GJS-600 which is often used for components of combustion engines. Under service conditions, those components are mechanically loaded at different temperatures. Therefore, this investigation targets at the fatigue behavior of EN-GJS-600 at ambient and elevated temperatures. Light and scanning electron microscopic investigations were done to characterize the sphericity of the graphite as well as the ferrite, pearlite and graphite fraction. At elevated temperatures, the consideration of dynamic strain ageing effects is of major importance. In total strain increase, temperature increase and constant total strain amplitude tests, the plastic strain amplitude, the stress amplitude, the change in temperature and the change in electrical resistance were measured. The measured values depend on plastic deformation processes in the bulk of the specimens and at the interfaces between matrix and graphite. The fatigue behavior of EN-GJS-600 is dominated by cyclic hardening processes. The physically based fatigue life calculation “PHYBALSIT” (SIT = strain increase test) was developed for total strain controlled fatigue tests. Only one temperature increase test is necessary to determine the temperature interval of pronounced dynamic strain ageing effects.
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