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<p>TNZ1313 medical titanium alloy, renowned for its outstanding comprehensive properties, finds extensive application in orthopedic implants and critical aerospace components. Systematic investigation of its dynamic mechanical response under high strain rates and extreme temperatures is crucial for ensuring the design and service reliability of related structural components. This study employed a split Hopkinson pressure bar (SHPB) apparatus to conduct compression tests at strain rates ranging from 1000 to 7000&#xa0;s<sup>−1</sup> and temperatures spanning − 90 to 500&#xa0;°C. True stress–strain curves were obtained, and the strain rate hardening and thermal softening parameters of the Johnson–Cook constitutive model were fitted and modified based on the experimental data. The results indicate that increased strain rates enhance the strain gradient within specimen, accelerate strain hardening, and mitigate the thermal softening effect, leading to higher and more stable stresses. Low temperatures significantly elevate the flow stress, while high temperatures intensify the thermal softening effect and reduce stress levels. Compared with the original Johnson–Cook constitutive model, the modified Johnson–Cook constitutive model significantly improves the predictive accuracy of experimental results. At different strain rates, MAPE and RMSE decreased by 77.86 and 76.52%, respectively; at different temperatures, MAPE and RMSE decreased by 83.65 and 88.28%, respectively. This model provides theoretical support for establishing the precise constitutive relationship of TNZ1313 and enhancing its ability to predict mechanical properties under extreme conditions.</p>

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Mechanical Properties and JC Constitutive Modification of TNZ1313 Titanium Alloys Considering High Strain Rates and High/Low Temperatures

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Desheng Li,
  • Gang Jin,
  • Mengpan Hu,
  • Yipu Bian,
  • Shaokun Luo,
  • Chong Li,
  • Xin Zhang,
  • Yonglin Min

摘要

TNZ1313 medical titanium alloy, renowned for its outstanding comprehensive properties, finds extensive application in orthopedic implants and critical aerospace components. Systematic investigation of its dynamic mechanical response under high strain rates and extreme temperatures is crucial for ensuring the design and service reliability of related structural components. This study employed a split Hopkinson pressure bar (SHPB) apparatus to conduct compression tests at strain rates ranging from 1000 to 7000 s−1 and temperatures spanning − 90 to 500 °C. True stress–strain curves were obtained, and the strain rate hardening and thermal softening parameters of the Johnson–Cook constitutive model were fitted and modified based on the experimental data. The results indicate that increased strain rates enhance the strain gradient within specimen, accelerate strain hardening, and mitigate the thermal softening effect, leading to higher and more stable stresses. Low temperatures significantly elevate the flow stress, while high temperatures intensify the thermal softening effect and reduce stress levels. Compared with the original Johnson–Cook constitutive model, the modified Johnson–Cook constitutive model significantly improves the predictive accuracy of experimental results. At different strain rates, MAPE and RMSE decreased by 77.86 and 76.52%, respectively; at different temperatures, MAPE and RMSE decreased by 83.65 and 88.28%, respectively. This model provides theoretical support for establishing the precise constitutive relationship of TNZ1313 and enhancing its ability to predict mechanical properties under extreme conditions.