Mechanism and Method of Testing Fracture Toughness and Impact Absorbed Energy of Ductile Metals by Spherical Indentation Tests

IF 4.2 2区工程技术 Q1 Engineering

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-20 DOI:10.1186/s10033-023-00913-6

Jianxun Li, Tairui Zhang, Shang Wang, Jirui Cheng, Weiqiang Wang

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引用次数: 1

Abstract

Abstract To address the problem of conventional approaches for mechanical property determination requiring destructive sampling, which may be unsuitable for in-service structures, the authors proposed a method for determining the quasi-static fracture toughness and impact absorbed energy of ductile metals from spherical indentation tests (SITs). The stress status and damage mechanism of SIT, mode I fracture, Charpy impact tests, and related tests were first investigated through finite element (FE) calculations and scanning electron microscopy (SEM) observations, respectively. It was found that the damage mechanism of SITs is different from that of mode I fractures, while mode I fractures and Charpy impact tests share the same damage mechanism. Considering the difference between SIT and mode I fractures, uniaxial tension and pure shear were introduced to correlate SIT with mode I fractures. Based on this, the widely used critical indentation energy (CIE) model for fracture toughness determination using SITs was modified. The quasi-static fracture toughness determined from the modified CIE model was used to evaluate the impact absorbed energy using the dynamic fracture toughness and energy for crack initiation. The effectiveness of the newly proposed method was verified through experiments on four types of steels: Q345R, SA508-3, 18MnMoNbR, and S30408.

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球形压痕试验测试延性金属断裂韧性和冲击吸收能的机理和方法

摘要:为了解决传统的力学性能测定方法需要破坏性取样而不适合在役结构的问题，作者提出了一种通过球形压痕试验(sit)测定延性金属的准静态断裂韧性和冲击吸收能的方法。首先通过有限元(FE)计算和扫描电镜(SEM)观察，分别研究了SIT、I型断裂、Charpy冲击试验及相关试验的应力状态和损伤机制。研究发现，sit的损伤机制不同于I型断裂，而I型断裂与Charpy冲击试验具有相同的损伤机制。考虑到SIT与I型裂缝的差异，引入单轴拉伸和纯剪切将SIT与I型裂缝关联起来。在此基础上，对广泛使用的临界压痕能(CIE)模型进行了修正。采用改进的CIE模型确定的准静态断裂韧性，利用动态断裂韧性和裂纹起裂能来评估冲击吸收能。通过对Q345R、SA508-3、18MnMoNbR和S30408四种钢的实验，验证了该方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Journal of Mechanical Engineering ENGINEERING, MECHANICAL-

CiteScore

5.60

自引率

4.80%

发文量

3097

审稿时长

8 months

期刊介绍： Chinese Journal of Mechanical Engineering (CJME) was launched in 1988. It is a peer-reviewed journal under the govern of China Association for Science and Technology (CAST) and sponsored by Chinese Mechanical Engineering Society (CMES). The publishing scopes of CJME follow with: Mechanism and Robotics, including but not limited to -- Innovative Mechanism Design -- Mechanical Transmission -- Robot Structure Design and Control -- Applications for Robotics (e.g., Industrial Robot, Medical Robot, Service Robot…) -- Tri-Co Robotics Intelligent Manufacturing Technology, including but not limited to -- Innovative Industrial Design -- Intelligent Machining Process -- Artificial Intelligence -- Micro- and Nano-manufacturing -- Material Increasing Manufacturing -- Intelligent Monitoring Technology -- Machine Fault Diagnostics and Prognostics Advanced Transportation Equipment, including but not limited to -- New Energy Vehicle Technology -- Unmanned Vehicle -- Advanced Rail Transportation -- Intelligent Transport System Ocean Engineering Equipment, including but not limited to --Equipment for Deep-sea Exploration -- Autonomous Underwater Vehicle Smart Material, including but not limited to --Special Metal Functional Materials --Advanced Composite Materials --Material Forming Technology.