EXPERIMENTAL STUDY ON THE PLANE STRAIN DYNAMIC FRACTURE TOUGHNESS OF 20CRMNTI BASED ON IMPROVED HPB PLATFORM

SONG Kun; ZHANG XiaoDi; DING Jun; HUANG Xia; HE XiaoJin; WANG JiaBin; WANG LuSheng

doi:10.16579/j.issn.1001.9669.2018.04.09

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EXPERIMENTAL STUDY ON THE PLANE STRAIN DYNAMIC FRACTURE TOUGHNESS OF 20CRMNTI BASED ON IMPROVED HPB PLATFORM

更新时间：2022-09-22

- EXPERIMENTAL STUDY ON THE PLANE STRAIN DYNAMIC FRACTURE TOUGHNESS OF 20CRMNTI BASED ON IMPROVED HPB PLATFORM
- Journal of Mechanical Strength Vol. 40, Issue 4, Pages: 815-821(2018)
- 作者机构：
  
  1. 重庆理工大学机械工程学院
  2. 长安汽车股份有限公司汽车工程研究总院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2018.04.09
  CLC：
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SONG Kun, ZHANG XiaoDi, DING Jun, et al. EXPERIMENTAL STUDY ON THE PLANE STRAIN DYNAMIC FRACTURE TOUGHNESS OF 20CRMNTI BASED ON IMPROVED HPB PLATFORM. [J]. 40(4):815-821(2018)
DOI：

SONG Kun, ZHANG XiaoDi, DING Jun, et al. EXPERIMENTAL STUDY ON THE PLANE STRAIN DYNAMIC FRACTURE TOUGHNESS OF 20CRMNTI BASED ON IMPROVED HPB PLATFORM. [J]. 40(4):815-821(2018) DOI： 10.16579/j.issn.1001.9669.2018.04.09.

摘要

为获得20Cr Mn Ti动态起裂韧度,利用改进式霍普金森压杆对三点弯曲试样施加冲击载荷,通过弹簧质量模型确定动态应力强度因子随时间的变化规律,采用应变片监测裂纹起裂时刻。通过上述实验过程得到20Cr Mn Ti在平面应变条件下I型裂纹扩展动态起裂韧度。实验过程中,利用波形整形技术有效抑制了应力波传播过程中由横向惯性效应引发的几何弥散畸变,保证了测点处应力波信号与加载点应力波的一致性;利用高速摄像系统跟踪动态断裂过程,并结合GOM Correlate软件对加载过程中试样表面应变场的变化进行分析,观察到裂纹起裂前试样已达到动态应力平衡状态,验证了实验方案和测试结果的有效性。实验结果表明,20Cr Mn Ti动态起裂韧度随着加载率的增加而增大,呈现出明显的加载率敏感性。

Abstract

To obtain the dynamic fracture toughness of 20 Cr Mn Ti,an impact loading test was conducted on three-point bending specimens with the improved Hopkinson pressure bar.Dynamic stress intensity factor was determined by the spring mass model.The onset time of crack initiation is experimentally detected using the strain gauge method.Dynamic fracture toughness of20 Cr Mn Ti with type I crack was obtained through the above experimental procedure.The geometrical dispersion distortion caused by lateral inertia effect is effectively inhibited by the wave shaping technique,to ensure the consistency of stress wave signal in measuring point and loading point is guaranteed.At the same time,the high-speed camera system was used to collect the image and the change of the surface strain field during the loading process was analyzed with GOM Correlate.The results show that samples before crack initiation has reached the dynamic strain balance,ensure the validity of the experiment.

关键词

20CrMnTi霍普金森压杆弹簧质量模型高速摄像系统GOM Correlate动态起裂韧度

Keywords

20CrMnTiHopkinson pressure barLumped mass-spring modelsHigh-speed camera systemGOM CorrelateDynamic fracture toughness

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Key Laboratory of Green Cutting Technology and Application in Gansu Province,Lanzhou Institute of Technology

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