江苏理工学院 机械工程学院,常州 213001
郝龙,男,2000年生,河南开封人,硕士研究生;主要研究方向为机械构件机械强度评定、可靠性分析;E-mail:2398542221@qq.com。
收稿:2024-12-30,
修回:2025-01-12,
网络首发:2026-07-17,
纸质出版:2026-07-15
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郝龙,代巧,李俊. 基于小冲杆试验的工业纯钛断裂韧性研究[J]. 机械强度,2026,48(7):94-101.
Hao Long,Dai Qiao,Li Jun. Study on fracture toughness of commercially pure titanium based on small punch test[J]. Journal of Mechanical Strength,2026,48(7):94-101.
郝龙,代巧,李俊. 基于小冲杆试验的工业纯钛断裂韧性研究[J]. 机械强度,2026,48(7):94-101. DOI: 10.16579/j.issn.1001.9669.2026.07.011.
Hao Long,Dai Qiao,Li Jun. Study on fracture toughness of commercially pure titanium based on small punch test[J]. Journal of Mechanical Strength,2026,48(7):94-101. DOI: 10.16579/j.issn.1001.9669.2026.07.011.
目的
2
针对在役钛制设备无法提供足够材料进行常规断裂试验这一问题,基于小冲杆试验建立由微小试样获取材料断裂韧性的方法,为在役设备的材料性能评估提供参考。
方法
2
首先,对工业纯钛TA2进行断裂韧性试验,获取其断裂韧性;然后,进行小冲杆试验,通过试样断口、载荷-位移曲线、能量等方面的分析,研究小冲杆试样的缺口长度对断裂过程的影响;最后,基于由小冲杆试验结果得到能量差的方法获取TA2的断裂韧性。
结果
2
结果表明,随着缺口长度的增加,小冲杆试样所能承受的最大载荷减小,载荷最大时的位移增大,试验过程中消耗的能量增加。试样的失效形式与缺口长度有关,无缺口试样和缺口长度为4.5 mm的试样的失效形式为周向断裂失效;缺口长度为5、5.5 mm的试样的失效形式为沿缺口方向裂纹扩展断裂失效;缺口长度为6 mm的试样的失效形式为缺口整体变形失效。当采用小冲杆试验评估材料断裂性能时,若侧开缺口试样的失效形式为沿缺口方向裂纹扩展断裂失效,通过不同缺口长度的试样在试验过程中消耗的能量差,便能有效评估材料的断裂性能。
Objective
2
Conventional fracture tests require a large amount of test material
which is difficult to obtain from in-service titanium equipment. To address this issue
a method for determining material fracture toughness using miniature specimens was established based on the small punch test
providing a reference for material performance evaluation of in-service equipment.
Methods
2
Firstly
standard fracture toughness tests were carried out on commercially pure titanium TA2 to acquire its fracture toughness. Secondly
small punch tests were performed. The effects of notch length on the fracture process of small punch specimens were investigated by analyzing fracture morphologies
load-displacement curves and absorbed energy. Finally
the fracture toughness of TA2 was determined via an energy difference method derived from small punch test data.
Results
2
The results show that as notch length increases
the maximum load borne by small punch specimens decreases
the displacement at maximum load rises
and the energy consumed during testing increases. In addition
the failure mode is dependent on notch length. Specimens without notches and those with a 4.5 mm notch fail via circumferential fracture
specimens with 5 mm and 5.5 mm notches experience crack propagation fracture along the notch direction
while specimens with a 6 mm notch undergo overall notch deformation failure. When evaluating material fracture properties using small punch tests
if side-notched specimens fail by crack propagation along the notch
the fracture performance of the material can be reliably characterized using the energy difference obtained from specimens with different notch lengths.
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