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<p>The impact of loading frequency and the damage parameter on the low-cycle fatigue characteristics of a biocompatible Ti-6Al-4V Grade 23 titanium alloy, manufactured using additive technologies, was investigated. This alloy is widely used for the manufacturing of individualized endoprostheses. Based on the hypothesis of commensurability of the mechanical characteristics of titanium alloys in tension and compression, experimental studies were conducted at a stress ratio <i>R</i> = 0 for 10<sup>5</sup> cycles at loading frequencies of 0.3 and 3 Hz. The basic equations of the theory of strengthening were used to describe cyclic creep. It was established that using the damage parameter in the governing equations for cyclic creep significantly improves the results. To obtain basic damage curves, the energy hypothesis, which accounts for the degradation of the material’s main mechanical characteristics, is justified. This hypothesis yields more accurate results for the scalar limiting damage parameter <i>D</i><sub><i>R</i></sub> than does the deformation equivalence hypothesis. It was shown that, for low-cycle loading, the ultimate accumulated deformation <i>ε</i><sub><i>CR</i></sub> decreases with increasing loading frequency by an order of magnitude (from 0.3 to 3.0 Hz). The stated regularity is also characteristic of low-cycle fatigue curves.</p>

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Low-Cycle Fatigue of Biocompatible Ti-6Al-4V Grade 23 Titanium Alloy Manufactured Via Additive Technologies

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • M. I. Bobyr,
  • V. V. Koval,
  • O. V. Tymoshenko,
  • O. F. Salenko

摘要

The impact of loading frequency and the damage parameter on the low-cycle fatigue characteristics of a biocompatible Ti-6Al-4V Grade 23 titanium alloy, manufactured using additive technologies, was investigated. This alloy is widely used for the manufacturing of individualized endoprostheses. Based on the hypothesis of commensurability of the mechanical characteristics of titanium alloys in tension and compression, experimental studies were conducted at a stress ratio R = 0 for 105 cycles at loading frequencies of 0.3 and 3 Hz. The basic equations of the theory of strengthening were used to describe cyclic creep. It was established that using the damage parameter in the governing equations for cyclic creep significantly improves the results. To obtain basic damage curves, the energy hypothesis, which accounts for the degradation of the material’s main mechanical characteristics, is justified. This hypothesis yields more accurate results for the scalar limiting damage parameter DR than does the deformation equivalence hypothesis. It was shown that, for low-cycle loading, the ultimate accumulated deformation εCR decreases with increasing loading frequency by an order of magnitude (from 0.3 to 3.0 Hz). The stated regularity is also characteristic of low-cycle fatigue curves.