| 摘要: |
| FKM标准主要用于钢、铸铁和铝合金构件的静强度及疲劳强度评估，其中aG和bG、aM和bM是评估
计算必要的2组材料参数。以增材制造的TA15钛合金中心缺口板状试样为研究对象，通过建立有限元模型计算
应力场分布，结合FKM标准和Neuber-Kuhn表达式，得出一组材料参数aG和bG，再对27件试样进行疲劳试验
并拟合出S-N曲线，利用FKM标准计算公式，逆向推算得到一组材料参数aM和bM。2组参数可用于增材制造钛
合金构件的疲劳强度评估，拓展了FKM标准的适用范围。 |
| 关键词: 增材制造 钛合金 FKM标准 参数识别 疲劳试验 |
| 基金项目:国家重点研发计划（2018****105800） |
|
| Material Parameters Identification for Fatigue Strength Assessment of Additively Manufactured Titanium Alloy Components in the FKM Guideline |
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Li Yuanjie1, Jin Haibo2,3, Xie Suijie4, Liu Jun1
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1. Nanjing Aerospace Sinoequip Co., Ltd., Nanjing 210032;2. Key Laboratory of Fundamental Science for National
Defense-advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics & Astronautics, Nanjing
210016;3;4.3. Wuhu State-owned Factory of Machining, Wuhu 241007
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| Abstract: |
| The FKM guideline is primarily used for assessing the static and fatigue strength of components made
of steel, cast iron, and aluminum alloys, with aG and bG , as well as aM and bM , being the two most critical material
parameter groups for these assessments. This study focused on additively manufactured TA15 titanium alloy specimens
with a center-notched plate design. A finite element model was established to calculate the stress field distribution, and
the FKM Guideline along with the Neuber-Kuhn expression was used to derive the material parameters aG and bG.
Subsequently, fatigue tests were conducted on 27 specimens to obtain an S-N curve through fitting, and the parameters
aM and bM were inversely calculated using FKM guideline formulas. These two sets of parameters enable the fatigue
assessment of additively manufactured titanium alloy components, extending the applicability of the FKM guideline. |
| Key words: additive manufacturing titanium alloy FKM guideline parameter identification fatigue testing |
