壁厚对<strong>HR2</strong>钢柱壳爆轰加载下膨胀断裂行为的影响

doi:10.11901/1005.3093.2019.177

材料研究学报

2020, Vol. 34

Issue (4): 241-246 DOI: 10.11901/1005.3093.2019.177

研究论文

本期目录 | 过刊浏览

壁厚对HR2钢柱壳爆轰加载下膨胀断裂行为的影响

卢秋虹¹(

), 王宁², 范诚³, 申勇峰², 刘明涛³, 汤铁钢³, 胡海波³

1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
2.东北大学材料科学与工程学院沈阳 110819
3.中国工程物理研究院流体物理研究所绵阳 621900

Effect of Shell Thickness on Expanding Fracture Behavior of HR2 Steel Cylinders under Explosive Loading

LU Qiuhong¹(

), WANG Ning², FAN Cheng³, SHEN Yongfeng², LIU Mingtao³, TANG Tiegang³, HU Haibo³

1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3.Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China

引用本文:

卢秋虹, 王宁, 范诚, 申勇峰, 刘明涛, 汤铁钢, 胡海波. 壁厚对HR2钢柱壳爆轰加载下膨胀断裂行为的影响[J]. 材料研究学报, 2020, 34(4): 241-246.
Qiuhong LU, Ning WANG, Cheng FAN, Yongfeng SHEN, Mingtao LIU, Tiegang TANG, Haibo HU. Effect of Shell Thickness on Expanding Fracture Behavior of HR2 Steel Cylinders under Explosive Loading[J]. Chinese Journal of Materials Research, 2020, 34(4): 241-246.

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摘要:

通过对6、12 mm两种不同壁厚的HR2钢柱壳进行爆轰加载实验，对其断裂碎片的宏观形貌、断口的微观形貌以及横截面的变形微观结构进行系统表征，研究了金属柱壳在爆轰加载下的膨胀断裂机理。结果表明，在膨胀断裂过程中壳壁厚度的增大导致HR2钢柱壳由纯剪切断裂变为拉剪混合的断裂模式。断裂碎片的微观结构分析结果表明，柱壳的断裂实际上是剪切裂纹从样品内部剪切带形核并扩展、和拉伸裂纹沿柱壳外表面的形核扩展的共同作用及竞争的结果。薄壁柱壳断裂由样品内裂纹沿剪切带的形核和扩展主导发生剪切断裂，而厚壁柱壳中内侧的裂纹沿剪切带的形核和扩展，但是最外侧则为环向拉应力主导发生拉伸断裂，因此表现出拉剪结合的断裂模式。

关键词 ：金属材料, HR2钢, 爆轰加载, 膨胀断裂, 微观结构, 剪切带, 断裂机理

Abstract：

To clarify the fracture mechanism of metal cylinder under explosive loading, HR2 steel cylinders with shell of 6 and 12 mm in thickness respectively were subjected to explosive loading. The fracture fragments were collected after explosion, and then systematically investigated in terms of macroscopic morphology, fracture morphology and deformation microstructure. It is found that when the shell thickness increases, the fracture mode of HR2 cylinder changed from shearing fracture to the mixture of shearing fracture and tensile fracture. The deformation microstructure observation indicates that the failure and fracture of cylinder shell are the result of the combination and competition of cracks-nucleating and -expanding from the shear band and from the outer surface. The fracture of thin cylinder is dominant by the cracks nucleating and expanding from the shear band, presenting shearing fracture mode. The fracture of thick cylinder is the combined action of cracks-nucleating and -expanding from the shear band and from the outer surface, presenting a mode of mixture of shear- and tensile-fracture.

Key words： metallic materials HR2 steel explosive loading expanding fracture microstructure shear bands fracture mechanism

收稿日期: 2019-03-28

ZTFLH:

TG142

基金资助:国家自然科学基金(No. U1530146);国家自然科学基金(No. 11602249);国家自然科学基金(No. U1730140)

作者简介: 卢秋虹，女，1974年生，副研究员

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.177 或 https://www.cjmr.org/CN/Y2020/V34/I4/241

表1 HR2钢的化学成分

图1 HR2钢柱壳芯部和外表面的原始微观结构金相

图2 膨胀爆轰装置的示意图

图3 HR2钢柱薄壁和厚壁壳断裂碎片的宏观形貌、断口形貌和断裂模式示意图。

图4 HR2钢柱壳爆轰加载后横截面的金相组织

图5 HR2钢薄壁柱壳爆轰加载后横截面微观结构。

图6 HR2柱壳爆轰加载后硬度沿柱壳壁厚的分布

图7 柱壳膨胀爆轰加载下所受应力的示意图

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