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首页> 外文期刊>Engineering Fracture Mechanics >Predicting the fatigue strength and life of 316L steel sinters of varying porosity for implants in a uniaxial loading state
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Predicting the fatigue strength and life of 316L steel sinters of varying porosity for implants in a uniaxial loading state

机译：在单轴加载状态下预测316L钢烧结器的疲劳强度和寿命

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摘要

This paper presents a new approach to predicting the fatigue strength and life of 316L steel sinters of varying porosity used in the production of implants. Uniaxial monotonic and periodically variable loads were taken into account. The research material consisted of sinters of 316L austenitic steel, with porositiesp?=?26%,p?=?33% andp?=?41%, obtained by powder metallurgy. Determined monotonic and fatigue curves within the range of uniaxial tension-compression made it possible to identify the process of fatigue damage growth and formulate numerical dependencies for predicting the fatigue life of porous materials. The variables of the porous sinter’s damage state were defined, and the law of damage accumulation (linear and non-linear approach) was formulated incrementally, so as to enable analysis of the influence of loading history on the material's fatigue life. In the proposed model, the increment of the damage state variable was made dependent on the increment of plastic strain and of the tensile stress value in the sample, and in the non-linear approach, also on the actual value of the damage state variable. The numerical model of fatigue damage accumulation was experimentally verified through tests performed by the authors on samples of porous sintered material with varying degrees of compaction.
机译：本文提出了一种预测植入物生产中使用不同孔隙率的316L钢烧结疲劳强度和寿命的新方法。考虑单轴单调和定期可变载荷。研究材料由316L奥氏体钢的索特组成，具有浮孔，Porositiesp？= 26％，p？= 33％Andp？=Δ41％，由粉末冶金获得。在单轴拉伸压缩范围内确定的单调和疲劳曲线使得可以识别疲劳损伤生长的过程，并制定用于预测多孔材料疲劳寿命的数值依赖性。定义了多孔烧结损伤状态的变量，逐步配制损伤积累（线性和非线性方法），以便能够分析负载历史对材料疲劳寿命的影响。在所提出的模型中，取决于塑料应变的增量和样品中的拉伸应力值，以及非线性方法的增量，以及非线性方法的增量，以及损坏状态变量的实际值。通过作者对具有不同程度的压实的多孔烧结材料样品进行的测试进行实验验证疲劳损伤积累的数值模型。

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