Effect of forming direction on cyclic plastic behavior near crack tip of additive manufacturing titanium alloy

LIU Qing; LI Jian; ZHAO Xun; SUN Tao; GE Junming; QUAN Shichao; CHEN Sihan; ZHANG Jiadi

doi:10.16579/j.issn.1001.9669.2026.06.013

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Effect of forming direction on cyclic plastic behavior near crack tip of additive manufacturing titanium alloy

·Experimental Research·Testing Technology· | 更新时间：2026-06-16

- Effect of forming direction on cyclic plastic behavior near crack tip of additive manufacturing titanium alloy
- Journal of Mechanical Strength Vol. 48, Issue 6, Pages: 117-127(2026)
- 作者机构：
  
  1.江苏大学土木工程与力学学院，镇江 212013
  2.江苏大学能源与动力工程学院，镇江 212013
- 作者简介：
  
  LI Jian, E-mail: lj66@ujs.edu.cn
- 基金信息：
  
  China Postdoctoral Science Foundation(2020M681496);National Natural Science Foundation of China(52105149);Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX24-3924)
- DOI：10.16579/j.issn.1001.9669.2026.06.013
  CLC： TH114;TG115.5
- Received：30 July 2024，
  
  Revised：2024-09-18，
  
  Published：15 June 2026
- 稿件说明：
移动端阅览
刘庆，李建，赵询，等. 成形方向对增材制造钛合金裂尖循环塑性行为的影响［J］. 机械强度，2026，48（6）：117-127.

LIU Qing，LI Jian，ZHAO Xun，et al. Effect of forming direction on cyclic plastic behavior near crack tip of additive manufacturing titanium alloy［J］. Journal of Mechanical Strength，2026，48（6）：117-127.
刘庆，李建，赵询，等. 成形方向对增材制造钛合金裂尖循环塑性行为的影响［J］. 机械强度，2026，48（6）：117-127. DOI： 10.16579/j.issn.1001.9669.2026.06.013.

LIU Qing，LI Jian，ZHAO Xun，et al. Effect of forming direction on cyclic plastic behavior near crack tip of additive manufacturing titanium alloy［J］. Journal of Mechanical Strength，2026，48（6）：117-127. DOI： 10.16579/j.issn.1001.9669.2026.06.013.

摘要

目的

揭示成形方向对激光选区熔化增材制造TC4钛合金裂尖循环塑性行为的影响机制，为增材制造钛合金承力构件抗疲劳设计提供参考。

方法

首先，制备0°（L

）、45°（L

）、90°（L

）3种成形方向的紧凑拉伸试样，测试获取不同方向材料的循环本构参数，为数值建模提供基础；其次，基于Chaboche混合强化本构模型，采用Abaqus软件建立含裂纹试样有限元模型，设计9组不同载荷参数方案，分析裂尖循环塑性演化规律；然后，采用数字图像相关技术开展疲劳加载试验，获取裂尖场量数据；最后，对比数值计算与试验结果，验证分析方法的可靠性。

结果

结果表明，成形方向对裂尖塑性应变、构件塑性应变能影响显著，相同载荷下，L

方向裂尖累积塑性应变、塑性应变能均最大，L

方向次之，L

方向最小，且差异随循环周次增加持续扩大；高载荷比、高载荷幅工况下，裂尖应力集中更显著，其塑性应变、平均弹性与塑性应变能均更高；成形方向对裂尖局部应力比、构件弹性应变能无显著影响。

Abstract

Objective

To reveal the influence mechanism of forming direction on the cyclic plastic behavior near the crack tip of selective laser melted TC4 titanium alloy

and provide reference for the anti-fatigue design of additive manufactured titanium alloy load-bearing components.

Methods

Firstly

compact tension specimens with three forming directions of 0° (L

)

45° (L

) and 90° (L

) were prepared

and the cyclic constitutive parameters of materials in different directions were obtained by tests to provide basis for numerical modeling. Secondly

based on the Chaboche mixed hardening constitutiv

e model

the finite element model of the cracked specimen was established by Abaqus software

and 9 groups of schemes with different load parameters were designed to analyze the evolution law of cyclic plasticity near the crack tip. Then

fatigue loading tests were carried out by digital image correlation technology to obtain the field data of the crack tip area. Finally

the numerical calculation results were compared with the test results to verify the reliability of the analysis method.

Results

The results show that the forming direction has a significant effect on the plastic strain at the crack tip and the plastic strain energy of the component. Under the same load condition

the cumulative plastic strain and plastic strain energy at the crack tip in L

direction are the largest

followed by those in L

direction

and the smallest in L

direction

and the difference increases continuously with the increase of cycle number. The stress concentration at the crack tip is more significant under high load ratio and high load amplitude conditions

with higher plastic strain

average elastic and plastic strain energy. The forming direction has no significant effect on the local stress ratio near the crack tip and the overall elastic strain energy of the component.

关键词

Keywords

references

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