High-Speed Shearing with Stress Concentration and Fracture Behavior of High-Strength Metal Bars

DONG Yuanzhe; LIU Boyang; ZHU Chengcheng; REN Yujian; ZHAO Shengdun

doi:10.7652/xjtuxb202408015

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High-Speed Shearing with Stress Concentration and Fracture Behavior of High-Strength Metal Bars

更新时间：2025-07-28

- High-Speed Shearing with Stress Concentration and Fracture Behavior of High-Strength Metal Bars
- Vol. 58, Issue 8, Pages: 145-155(2024)
- 作者机构：
  
  1. 长安大学道路施工技术与装备教育部重点实验室,西安,710064
  2. 西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202408015
  CLC： TG316
- Online First：10 August 2024，
  
  Published：2024
- 稿件说明：
移动端阅览
DONG Yuanzhe, LIU Boyang, ZHU Chengcheng, et al. High-Speed Shearing with Stress Concentration and Fracture Behavior of High-Strength Metal Bars[J]. 2024, 58(8): 145-155.
DOI：

DONG Yuanzhe, LIU Boyang, ZHU Chengcheng, et al. High-Speed Shearing with Stress Concentration and Fracture Behavior of High-Strength Metal Bars[J]. 2024, 58(8): 145-155. DOI： 10.7652/xjtuxb202408015.

摘要

针对传统剪切工艺不适用于高强度金属棒料高效精密切断的难题

提出了高速与应力集中复合的精密剪切新原理工艺

分析了环形槽几何参数对理论应力集中系数的影响

建立了42CrMo高强度棒料的高速剪切断裂有限元模型

研究了铣削和激光旋切环形槽对槽根等效应力应变场、应力三轴度、损伤起裂及三维裂纹扩展断裂行为的影响

并通过高速剪切试验

获得了不同环形槽对棒料剪切断面质量的影响规律。研究结果表明:对于表面不带环形槽的棒料

损伤起裂需要较大程度的塑性变形累积

切断后的棒料存在压塌及飞边缺陷; 所提工艺方法有效约束了槽根附近材料的塑性变形

提高了高速剪切断面质量

圆度误差由11.2%减少到2.3%～4.7%

平面度误差由1.08 mm降低为0.58～0.65 mm

最大弯曲变形度由1.5 mm降低为0.4～0.5 mm

最大剪切载荷和断裂能量也得到了显著降低; 相比铣削环形槽

激光旋切获得的尖角窄槽进一步降低了剪切载荷和断裂能量。新工艺方法可为高强度金属棒料的高效、精密及低能耗剪切行为提供参考。

Abstract

Due to the deficiencies of low efficiency and precision in traditional shearing methods

a new high-speed precise shearing method with stress concentration is proposed for high-strength metal bars. The influence of geometric parameters of circumferential notches is analyzed on theoretical stress concentration coefficient. High-speed shearing finite element models are established for 42CrMo bars with notches processed by milling cutter or laser

and the effects of notches on fracture behavior

such as damage initiation and three-dimensional crack propagation

are revealed based on distribution of equivalent stress

plastic strain and stress triaxiality. Besides

comparative experimental tests are conducted

and section quality is evaluated for notched and unnotched 42CrMo bars. The results show that for unnotched bars

the damage initiation needs more accumulation of plastic deformation

and squeezed flashes are left on the fracture section. As contrast

the new method effectively restrains the plastic deformation near the notch and improves the section quality

with roundness error from 11.2% to 2.3%—4.7%

flatness error from 1.08 mm to 0.58—0.65 mm

and the maximum bending deformation from 1.5 mm to 0.4—0.5 mm. The maximum shear load and fracture energy also decrease significantly. In addition

compared with milled notches

the narrow and sharp notches by laser further reduce the shear load and fracture energy. The new method shows advantages of high efficiency and precision

and low energy consumption.

关键词

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references

赵升吨. 高端锻压制造装备及其智能化 [M]. 北京: 机械工业出版社, 2019.

THIPPRAKMAS S, JIN M, MURAKAWA M. An investigation of material flow analysis in fineblanking process [J]. Journal of Materials Processing Technology, 2007, 192-193: 237-242.

CHEN Mingan, LI Huizhong, LI Xueqian, et al. Characterization of deformation microstructure and fractured surface of plastic shearing of copper bar [J]. Materials Science and Engineering, 2007, 452-453: 454-461.

KAJINO S, ASAKAWA M. New billet cutting process combining torsion and shear load to reduce droop height [J]. Journal of Materials Processing Technology, 2020, 282: 116660.

HU C L, CHEN L Q, ZHAO Zhen, et al. Study on the pre-shearing cropping process of steel bars [J]. The International Journal of Advanced Manufacturing Technology, 2018, 97(1): 783-793.

赵仁峰, 赵升吨, 钟斌, 等. 低周疲劳精密下料新工艺及试验研究 [J]. 机械工程学报, 2012, 48(24): 38-43.

ZHAO Renfeng, ZHAO Shengdun, ZHONG Bin, et al. Experimental study on new low cycle fatigue precision cropping process [J]. Journal of Mechanical Engineering, 2012, 48(24): 38-43.

赵升吨. 低应力疲劳裂纹可控式精密分离技术 [M]. 西安: 西安交通大学出版社, 2019.

SONG J L, LI Y T, LIU Z Q, et al. Numerical simulation and experiments of precision bar cutting based on high speed and restrained state [J]. Materials Science and Engineering: A, 2009, 499(1/2): 225-229.

ORGAN A J. The calibration of high energy-rate impact forming machines [J]. International Journal of Machine Tool Design and Research, 1967, 7(4): 325-349.

付建华, 李永堂, 雷步芳, 等. 金属棒料高速精密剪切试验研究 [J]. 机械工程学报, 2005, 41(5): 154-156.

FU Jianhua, LI Yongtang, LEI Bufang, et al. Experimental research on the high-speed precision shearing of metal bar [J]. Chinese Journal of Mechanical Engineering, 2005, 41(5): 154-156.

ARMSTRONG R W, WALLEY S M. High strain rate properties of metals and alloys [J]. International Materials Reviews, 2008, 53(3): 105-128.

SINGH N K, CADONI E, SINGHA M K, et al. Dynamic tensile and compressive behaviors of mild steel at wide range of strain rates [J]. Journal of Engineering Mechanics, 2013, 139(9): 1197-1206.

HOR A, MOREL F, LEBRUN J L, et al. An experimental investigation of the behaviour of steels over large temperature and strain rate ranges [J]. International Journal of Mechanical Sciences, 2013, 67: 108-122.

LU Yesen, ZHU Zhiwu, LI Dingyuan, et al. Constitutive model of 42CrMo steel under a wide range of strain rates based on crystal plasticity theory [J]. Materials Science and Engineering, 2017, 679: 215-222.

ZHU Zhiwu, LU Yesen, XIE Qijun, et al. Mechanical properties and dynamic constitutive model of 42CrMo steel [J]. Materials Design, 2017, 119: 171-179.

GUO Yazhou, RUAN Qichao, ZHU Shengxin, et al. Temperature rise associated with adiabatic shear band: causality clarified [J]. Physical Review Letters, 2019, 122(1): 015503.

SHANG Hongchun, WU Pengfei, LOU Yanshan, et al. Machine learning-based modeling of the coupling effect of strain rate and temperature on strain hardening for 5182-O aluminum alloy [J]. Journal of Materials Processing Technology, 2022, 302: 117501.

BAI Yuanli, WIERZBICKI T. A new model of metal plasticity and fracture with pressure and lode dependence [J]. International Journal of Plasticity, 2008, 24(6): 1071-1096.

XUE Liang, WIERZBICKI T. Numerical simulation of fracture mode transition in ductile plates [J]. International Journal of Solids and Structures, 2009, 46(6): 1423-1435.

LOU Yanshan, HUH H. Evaluation of ductile fracture criteria in a general three-dimensional stress state considering the stress triaxiality and the lode parameter [J]. Acta Mechanica Solida Sinica, 2013, 26(6): 642-658.

LOU Yanshan, HUH H, LIM S, et al. New ductile fracture criterion for prediction of fracture forming limit diagrams of sheet metals [J]. International Journal of Solids and Structures, 2012, 49(25): 3605-3615.

ZHUANG Xincun, MENG Yehui, ZHAO Zhen. Evaluation of prediction error resulting from using average state variables in the calibration of ductile fracture criterion [J]. International Journal of Damage Mechanics, 2018, 27(8): 1231-1251.

西安交通大学. 一种径向约束金属棒料的低应力双面高速剪切方法: CN201610606879.3 [P]. 2016-10-26.

西安交通大学. 一种对称多刀的棒管料开槽机: CN201410193035.1 [P]. 2014-08-20.

ZAPPALORTO M, LAZZARIN P, YATES J R. Elastic stress distributions for hyperbolic and parabolic notches in round shafts under torsion and uniform antiplane shear loadings [J]. International Journal of Solids and Structures, 2008, 45(18/19): 4879-4901.

NODA N A, TAKASE Y. Stress concentration for-mula useful for all notch shape in a round bar(comparison between torsion, tension and bending)[J]. International Journal of Fatigue, 2006, 28(2): 151-163.

董渊哲, 赵升吨, 崔敏超, 等. 40Cr圆棒低应力剪切的激光旋切环形槽理论与试验研究 [J]. 西安交通大学学报, 2016, 50(11): 121-128.

DONG Yuanzhe, ZHAO Shengdun, CUI Minchao, et al. Theoretical and experimental study on laser rotary grooving for 40Cr bar low-stress shearing [J]. Journal of Xi'an Jiaotong University, 2016, 50(11): 121-128.

GU Liyao, WANG Minjie, DUAN Chunzheng. On adiabatic shear localized fracture during serrated chip evolution in high speed machining of hardened AISI 1045 steel [J]. International Journal of Mechanical Sciences, 2013, 75: 288-298.

YU T X, CHEN F L. A further study of plastic shear failure of impulsively loaded clamped beams [J]. International Journal of Impact Engineering, 2000, 24(6/7): 613-629.

崔敏超, 赵升吨, 孙红星, 等. 开槽方法对低应力精密下料工艺的影响 [J]. 锻压技术, 2017, 42(10): 62-68.

CUI Minchao, ZHAO Shengdun, SUN Hongxing, et al. Influences of slotting methods on low-stress precision cutting [J]. Forging Stamping Technology, 2017, 42(10): 62-68.

杜成明, 李勇, 孙影, 等. 42CrMo钢表面激光淬火硬化试验研究 [J]. 材料保护, 2022, 55(7): 160-164.

DU Chengming, LI Yong, SUN Ying, et al. Experimental study on laser quenching hardening of 42CrMo steel surface [J]. Materials Protection, 2022, 55(7): 160-164.

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