适应多种平均应力表现的Chaboche叶片疲劳寿命预测模型及方法

本发明公开了一种适应多种平均应力表现的Chaboche叶片疲劳寿命预测模型。在Chaboche模型中，微裂纹的萌生和扩展用连续性损伤变量D的积分来表示，D＝0代表未开始损伤，D＝1代表宏观裂纹的开始即材料剩余寿命的结束；损伤变量D从0到1的过程即材料剩余寿命；为准确描述损伤速率，采用适应多种平均应力表达方式，建立平均应力与循环次数函数关系。本发明具有可以分析燃机叶片在不同平均应力前提下的疲劳寿命行为，可以同时满足不同平均应力影响、可以准确的对材料疲劳损伤描述的优点。本发明还公开了适应多种平均应力表现的Chaboche叶片疲劳寿命预测模型对压气机叶片的寿命预测方法。 The invention...

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Bibliographic Details
Format Patent
LanguageChinese
Published 02.08.2024
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:本发明公开了一种适应多种平均应力表现的Chaboche叶片疲劳寿命预测模型。在Chaboche模型中，微裂纹的萌生和扩展用连续性损伤变量D的积分来表示，D＝0代表未开始损伤，D＝1代表宏观裂纹的开始即材料剩余寿命的结束；损伤变量D从0到1的过程即材料剩余寿命；为准确描述损伤速率，采用适应多种平均应力表达方式，建立平均应力与循环次数函数关系。本发明具有可以分析燃机叶片在不同平均应力前提下的疲劳寿命行为，可以同时满足不同平均应力影响、可以准确的对材料疲劳损伤描述的优点。本发明还公开了适应多种平均应力表现的Chaboche叶片疲劳寿命预测模型对压气机叶片的寿命预测方法。 The invention discloses a Chboch blade fatigue life prediction model suitable for various average stress expressions. In the Chboch model, the initiation and propagation of the microcrack are represented by the integral of a continuous damage variable D, D = 0 represents that damage is not started, and D = 1 represents that the start of the macroscopic crack is the end of the residual life of the material; the process of the damage variable D from 0 to 1 is the residual life of the material; in order to accurately describe the damage rate, a plurality of average stress expression modes are adopted, and a function relationship between the average stress and the cycle number is established. The method has the advantages that the f
Bibliography:Application Number: CN202211657514